671 lines
24 KiB
C
671 lines
24 KiB
C
#ifndef _XPLMDataAccess_h_
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#define _XPLMDataAccess_h_
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/*
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* Copyright 2005-2012 Sandy Barbour and Ben Supnik
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*
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* All rights reserved. See license.txt for usage.
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*
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* X-Plane SDK Version: 2.1.1
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*
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*/
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/*
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* XPLM Data Access API - Theory of Operation
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*
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* The data access API gives you a generic, flexible, high performance way to
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* read and write data to and from X-Plane and other plug-ins. For example,
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* this API allows you to read and set the nav radios, get the plane location,
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* determine the current effective graphics frame rate, etc.
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*
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* The data access APIs are the way that you read and write data from the sim
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* as well as other plugins.
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*
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* The API works using opaque data references. A data reference is a source
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* of data; you do not know where it comes from, but once you have it you can
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* read the data quickly and possibly write it. To get a data reference, you
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* look it up.
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*
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* Data references are identified by verbose string names
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* (sim/cockpit/radios/nav1_freq_hz). The actual numeric value of the data
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* reference is implementation defined and is likely to change each time the
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* simulator is run (or the plugin that provides the datareference is
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* reloaded).
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*
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* The task of looking up a data reference is relatively expensive; look up
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* your data references once based on verbose strings, and save the opaque
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* data reference value for the duration of your plugin's operation. Reading
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* and writing data references is relatively fast (the cost is equivalent to
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* two function calls through function pointers).
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*
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* This allows data access to be high performance, while leaving in
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* abstraction; since data references are opaque and are searched for, the
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* underlying data access system can be rebuilt.
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*
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* A note on typing: you must know the correct data type to read and write.
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* APIs are provided for reading and writing data in a number of ways. You
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* can also double check the data type for a data ref. Note that automatic
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* conversion is not done for you.
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*
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* A note for plugins sharing data with other plugins: the load order of
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* plugins is not guaranteed. To make sure that every plugin publishing data
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* has published their data references before other plugins try to subscribe,
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* publish your data references in your start routine but resolve them the
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* first time your 'enable' routine is called, or the first time they are
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* needed in code.
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*
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* X-Plane publishes well over 1000 datarefs; a complete list may be found in
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* the reference section of the SDK online documentation (from the SDK home
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* page, choose Documentation).
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*
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*/
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#include "XPLMDefs.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***************************************************************************
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* READING AND WRITING DATA
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***************************************************************************/
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/*
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* These routines allow you to access a wide variety of data from within
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* x-plane and modify some of it.
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*
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*/
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/*
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* XPLMDataRef
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*
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* A data ref is an opaque handle to data provided by the simulator or another
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* plugin. It uniquely identifies one variable (or array of variables) over
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* the lifetime of your plugin. You never hard code these values; you always
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* get them from XPLMFindDataRef.
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*
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*/
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typedef void *XPLMDataRef;
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/*
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* XPLMDataTypeID
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*
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* This is an enumeration that defines the type of the data behind a data
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* reference. This allows you to sanity check that the data type matches what
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* you expect. But for the most part, you will know the type of data you are
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* expecting from the online documentation.
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*
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* Data types each take a bit field, so sets of data types may be formed.
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*
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*/
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enum {
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/* Data of a type the current XPLM doesn't do. */
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xplmType_Unknown = 0
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/* A single 4-byte integer, native endian. */
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,
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xplmType_Int = 1
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/* A single 4-byte float, native endian. */
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,
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xplmType_Float = 2
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/* A single 8-byte double, native endian. */
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,
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xplmType_Double = 4
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/* An array of 4-byte floats, native endian. */
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,
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xplmType_FloatArray = 8
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/* An array of 4-byte integers, native endian. */
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,
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xplmType_IntArray = 16
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/* A variable block of data. */
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,
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xplmType_Data = 32
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};
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typedef int XPLMDataTypeID;
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/*
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* XPLMFindDataRef
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*
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* Given a c-style string that names the data ref, this routine looks up the
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* actual opaque XPLMDataRef that you use to read and write the data. The
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* string names for datarefs are published on the x-plane SDK web site.
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*
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* This function returns NULL if the data ref cannot be found.
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*
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* NOTE: this function is relatively expensive; save the XPLMDataRef this
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* function returns for future use. Do not look up your data ref by string
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* every time you need to read or write it.
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*
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*/
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XPLM_API XPLMDataRef XPLMFindDataRef(const char *inDataRefName);
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/*
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* XPLMCanWriteDataRef
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*
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* Given a data ref, this routine returns true if you can successfully set
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* the data, false otherwise. Some datarefs are read-only.
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*
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*/
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XPLM_API int XPLMCanWriteDataRef(XPLMDataRef inDataRef);
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/*
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* XPLMIsDataRefGood
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*
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* WARNING: This function is deprecated and should not be used. Datarefs are
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* valid until plugins are reloaded or the sim quits. Plugins sharing
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* datarefs should support these semantics by not unregistering datarefs
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* during operation. (You should however unregister datarefs when your plugin
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* is unloaded, as part of general resource cleanup.)
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*
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* This function returns whether a data ref is still valid. If it returns
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* false, you should refind the data ref from its original string. Calling an
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* accessor function on a bad data ref will return a default value, typically
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* 0 or 0-length data.
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*
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*/
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XPLM_API int XPLMIsDataRefGood(XPLMDataRef inDataRef);
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/*
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* XPLMGetDataRefTypes
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*
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* This routine returns the types of the data ref for accessor use. If a data
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* ref is available in multiple data types, they will all be returned.
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*
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*/
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XPLM_API XPLMDataTypeID XPLMGetDataRefTypes(XPLMDataRef inDataRef);
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/***************************************************************************
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* DATA ACCESSORS
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***************************************************************************/
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/*
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* These routines read and write the data references. For each supported data
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* type there is a reader and a writer.
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*
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* If the data ref is invalid or the plugin that provides it is disabled or
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* there is a type mismatch, the functions that read data will return 0 as a
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* default value or not modify the passed in memory. The plugins that write
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* data will not write under these circumstances or if the data ref is
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* read-only. NOTE: to keep the overhead of reading datarefs low, these
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* routines do not do full validation of a dataref; passing a junk value for
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* a dataref can result in crashing the sim.
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*
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* For array-style datarefs, you specify the number of items to read/write and
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* the offset into the array; the actual number of items read or written is
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* returned. This may be less to prevent an array-out-of-bounds error.
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*
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*/
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/*
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* XPLMGetDatai
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*
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* Read an integer data ref and return its value. The return value is the
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* dataref value or 0 if the dataref is invalid/NULL or the plugin is
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* disabled.
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*
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*/
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XPLM_API int XPLMGetDatai(XPLMDataRef inDataRef);
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/*
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* XPLMSetDatai
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*
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* Write a new value to an integer data ref. This routine is a no-op if the
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* plugin publishing the dataref is disabled, the dataref is invalid, or the
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* dataref is not writable.
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*
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*/
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XPLM_API void XPLMSetDatai(XPLMDataRef inDataRef, int inValue);
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/*
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* XPLMGetDataf
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*
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* Read a single precision floating point dataref and return its value. The
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* return value is the dataref value or 0.0 if the dataref is invalid/NULL or
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* the plugin is disabled.
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*
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*/
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XPLM_API float XPLMGetDataf(XPLMDataRef inDataRef);
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/*
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* XPLMSetDataf
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*
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* Write a new value to a single precision floating point data ref. This
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* routine is a no-op if the plugin publishing the dataref is disabled, the
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* dataref is invalid, or the dataref is not writable.
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*
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*/
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XPLM_API void XPLMSetDataf(XPLMDataRef inDataRef, float inValue);
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/*
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* XPLMGetDatad
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*
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* Read a double precision floating point dataref and return its value. The
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* return value is the dataref value or 0.0 if the dataref is invalid/NULL or
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* the plugin is disabled.
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*
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*/
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XPLM_API double XPLMGetDatad(XPLMDataRef inDataRef);
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/*
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* XPLMSetDatad
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*
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* Write a new value to a double precision floating point data ref. This
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* routine is a no-op if the plugin publishing the dataref is disabled, the
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* dataref is invalid, or the dataref is not writable.
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*
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*/
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XPLM_API void XPLMSetDatad(XPLMDataRef inDataRef, double inValue);
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/*
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* XPLMGetDatavi
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*
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* Read a part of an integer array dataref. If you pass NULL for outVaules,
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* the routine will return the size of the array, ignoring inOffset and inMax.
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*
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*
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* If outValues is not NULL, then up to inMax values are copied from the
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* dataref into outValues, starting at inOffset in the dataref. If inMax +
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* inOffset is larger than the size of the dataref, less than inMax values
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* will be copied. The number of values copied is returned.
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*
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* Note: the semantics of array datarefs are entirely implemented by the
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* plugin (or X-Plane) that provides the dataref, not the SDK itself; the
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* above description is how these datarefs are intended to work, but a rogue
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* plugin may have different behavior.
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*
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*/
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XPLM_API int XPLMGetDatavi(XPLMDataRef inDataRef,
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int *outValues, /* Can be NULL */
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int inOffset,
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int inMax);
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/*
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* XPLMSetDatavi
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*
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* Write part or all of an integer array dataref. The values passed by
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* inValues are written into the dataref starting at inOffset. Up to inCount
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* values are written; however if the values would write "off the end" of the
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* dataref array, then fewer values are written.
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*
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* Note: the semantics of array datarefs are entirely implemented by the
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* plugin (or X-Plane) that provides the dataref, not the SDK itself; the
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* above description is how these datarefs are intended to work, but a rogue
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* plugin may have different behavior.
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*
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*/
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XPLM_API void XPLMSetDatavi(XPLMDataRef inDataRef,
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int *inValues,
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int inoffset,
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int inCount);
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/*
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* XPLMGetDatavf
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*
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* Read a part of a single precision floating point array dataref. If you
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* pass NULL for outVaules, the routine will return the size of the array,
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* ignoring inOffset and inMax.
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*
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* If outValues is not NULL, then up to inMax values are copied from the
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* dataref into outValues, starting at inOffset in the dataref. If inMax +
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* inOffset is larger than the size of the dataref, less than inMax values
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* will be copied. The number of values copied is returned.
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*
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* Note: the semantics of array datarefs are entirely implemented by the
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* plugin (or X-Plane) that provides the dataref, not the SDK itself; the
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* above description is how these datarefs are intended to work, but a rogue
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* plugin may have different behavior.
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*
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*/
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XPLM_API int XPLMGetDatavf(XPLMDataRef inDataRef,
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float *outValues, /* Can be NULL */
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int inOffset,
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int inMax);
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/*
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* XPLMSetDatavf
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*
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* Write part or all of a single precision floating point array dataref. The
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* values passed by inValues are written into the dataref starting at
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* inOffset. Up to inCount values are written; however if the values would
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* write "off the end" of the dataref array, then fewer values are written.
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*
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* Note: the semantics of array datarefs are entirely implemented by the
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* plugin (or X-Plane) that provides the dataref, not the SDK itself; the
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* above description is how these datarefs are intended to work, but a rogue
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* plugin may have different behavior.
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*
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*/
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XPLM_API void XPLMSetDatavf(XPLMDataRef inDataRef,
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float *inValues,
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int inoffset,
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int inCount);
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/*
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* XPLMGetDatab
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*
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* Read a part of a byte array dataref. If you pass NULL for outVaules, the
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* routine will return the size of the array, ignoring inOffset and inMax.
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*
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* If outValues is not NULL, then up to inMax values are copied from the
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* dataref into outValues, starting at inOffset in the dataref. If inMax +
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* inOffset is larger than the size of the dataref, less than inMax values
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* will be copied. The number of values copied is returned.
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*
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* Note: the semantics of array datarefs are entirely implemented by the
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* plugin (or X-Plane) that provides the dataref, not the SDK itself; the
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* above description is how these datarefs are intended to work, but a rogue
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* plugin may have different behavior.
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*
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*/
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XPLM_API int XPLMGetDatab(XPLMDataRef inDataRef,
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void *outValue, /* Can be NULL */
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int inOffset,
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int inMaxBytes);
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/*
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* XPLMSetDatab
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*
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* Write part or all of a byte array dataref. The values passed by inValues
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* are written into the dataref starting at inOffset. Up to inCount values
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* are written; however if the values would write "off the end" of the dataref
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* array, then fewer values are written.
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*
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* Note: the semantics of array datarefs are entirely implemented by the
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* plugin (or X-Plane) that provides the dataref, not the SDK itself; the
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* above description is how these datarefs are intended to work, but a rogue
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* plugin may have different behavior.
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*
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*/
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XPLM_API void XPLMSetDatab(XPLMDataRef inDataRef,
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void *inValue,
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int inOffset,
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int inLength);
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/***************************************************************************
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* PUBLISHING YOUR PLUGINS DATA
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***************************************************************************/
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/*
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* These functions allow you to create data references that other plug-ins can
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* access via the above data access APIs. Data references published by other
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* plugins operate the same as ones published by x-plane in all manners except
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* that your data reference will not be available to other plugins if/when
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* your plugin is disabled.
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*
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* You share data by registering data provider callback functions. When a
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* plug-in requests your data, these callbacks are then called. You provide
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* one callback to return the value when a plugin 'reads' it and another to
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* change the value when a plugin 'writes' it.
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*
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* Important: you must pick a prefix for your datarefs other than "sim/" -
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* this prefix is reserved for X-Plane. The X-Plane SDK website contains a
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* registry where authors can select a unique first word for dataref names, to
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* prevent dataref collisions between plugins.
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*
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*/
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/*
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* XPLMGetDatai_f
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*
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* Data provider function pointers.
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*
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* These define the function pointers you provide to get or set data. Note
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* that you are passed a generic pointer for each one. This is the same
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* pointer you pass in your register routine; you can use it to find global
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* variables, etc.
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*
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* The semantics of your callbacks are the same as the dataref accessor above
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* - basically routines like XPLMGetDatai are just pass-throughs from a caller
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* to your plugin. Be particularly mindful in implementing array dataref
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* read-write accessors; you are responsible for avoiding overruns, supporting
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* offset read/writes, and handling a read with a NULL buffer.
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*
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*/
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typedef int (*XPLMGetDatai_f)(void *inRefcon);
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/*
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* XPLMSetDatai_f
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*
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*
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*/
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typedef void (*XPLMSetDatai_f)(void *inRefcon, int inValue);
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/*
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* XPLMGetDataf_f
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*
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*
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*/
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typedef float (*XPLMGetDataf_f)(void *inRefcon);
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/*
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* XPLMSetDataf_f
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*
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*
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*/
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typedef void (*XPLMSetDataf_f)(void *inRefcon, float inValue);
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/*
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* XPLMGetDatad_f
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*
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*
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*/
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typedef double (*XPLMGetDatad_f)(void *inRefcon);
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/*
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* XPLMSetDatad_f
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*
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*
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*/
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typedef void (*XPLMSetDatad_f)(void *inRefcon, double inValue);
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/*
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* XPLMGetDatavi_f
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*
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*
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*/
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typedef int (*XPLMGetDatavi_f)(void *inRefcon,
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int *outValues, /* Can be NULL */
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int inOffset,
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int inMax);
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/*
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* XPLMSetDatavi_f
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*
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*
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*/
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typedef void (*XPLMSetDatavi_f)(void *inRefcon,
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int *inValues,
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int inOffset,
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int inCount);
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/*
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* XPLMGetDatavf_f
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*
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*
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*/
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typedef int (*XPLMGetDatavf_f)(void *inRefcon,
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float *outValues, /* Can be NULL */
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int inOffset,
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int inMax);
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/*
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* XPLMSetDatavf_f
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*
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*
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*/
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typedef void (*XPLMSetDatavf_f)(void *inRefcon,
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float *inValues,
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int inOffset,
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int inCount);
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/*
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* XPLMGetDatab_f
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*
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*
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*/
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typedef int (*XPLMGetDatab_f)(void *inRefcon,
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void *outValue, /* Can be NULL */
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int inOffset,
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int inMaxLength);
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/*
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* XPLMSetDatab_f
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*
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*
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*/
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typedef void (*XPLMSetDatab_f)(void *inRefcon,
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void *inValue,
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int inOffset,
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int inLength);
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/*
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* XPLMRegisterDataAccessor
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*
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* This routine creates a new item of data that can be read and written. Pass
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* in the data's full name for searching, the type(s) of the data for
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* accessing, and whether the data can be written to. For each data type you
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* support, pass in a read accessor function and a write accessor function if
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* necessary. Pass NULL for data types you do not support or write accessors
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* if you are read-only.
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*
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* You are returned a data ref for the new item of data created. You can use
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* this data ref to unregister your data later or read or write from it.
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*
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*/
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XPLM_API XPLMDataRef XPLMRegisterDataAccessor(const char *inDataName,
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XPLMDataTypeID inDataType,
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int inIsWritable,
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XPLMGetDatai_f inReadInt,
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XPLMSetDatai_f inWriteInt,
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XPLMGetDataf_f inReadFloat,
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XPLMSetDataf_f inWriteFloat,
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XPLMGetDatad_f inReadDouble,
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XPLMSetDatad_f inWriteDouble,
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XPLMGetDatavi_f inReadIntArray,
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XPLMSetDatavi_f inWriteIntArray,
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XPLMGetDatavf_f inReadFloatArray,
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XPLMSetDatavf_f inWriteFloatArray,
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XPLMGetDatab_f inReadData,
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XPLMSetDatab_f inWriteData,
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void *inReadRefcon,
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void *inWriteRefcon);
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/*
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* XPLMUnregisterDataAccessor
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*
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* Use this routine to unregister any data accessors you may have registered.
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* You unregister a data ref by the XPLMDataRef you get back from
|
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* registration. Once you unregister a data ref, your function pointer will
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* not be called anymore.
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*
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* For maximum compatibility, do not unregister your data accessors until
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* final shutdown (when your XPluginStop routine is called). This allows
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* other plugins to find your data reference once and use it for their entire
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* time of operation.
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*
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*/
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XPLM_API void XPLMUnregisterDataAccessor(XPLMDataRef inDataRef);
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|
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/***************************************************************************
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* SHARING DATA BETWEEN MULTIPLE PLUGINS
|
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***************************************************************************/
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/*
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* The data reference registration APIs from the previous section allow a
|
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* plugin to publish data in a one-owner manner; the plugin that publishes the
|
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* data reference owns the real memory that the data ref uses. This is
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* satisfactory for most cases, but there are also cases where plugnis need to
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* share actual data.
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*
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* With a shared data reference, no one plugin owns the actual memory for the
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* data reference; the plugin SDK allocates that for you. When the first
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* plugin asks to 'share' the data, the memory is allocated. When the data is
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* changed, every plugin that is sharing the data is notified.
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*
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* Shared data references differ from the 'owned' data references from the
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* previous section in a few ways:
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*
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* - With shared data references, any plugin can create the data reference;
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* with owned plugins one plugin must create the data reference and others
|
|
* subscribe. (This can be a problem if you don't know which set of plugins
|
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* will be present).
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*
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* - With shared data references, every plugin that is sharing the data is
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* notified when the data is changed. With owned data references, only the
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* one owner is notified when the data is changed.
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*
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* - With shared data references, you cannot access the physical memory of the
|
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* data reference; you must use the XPLMGet... and XPLMSet... APIs. With an
|
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* owned data reference, the one owning data reference can manipulate the
|
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* data reference's memory in any way it sees fit.
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|
*
|
|
* Shared data references solve two problems: if you need to have a data
|
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* reference used by several plugins but do not know which plugins will be
|
|
* installed, or if all plugins sharing data need to be notified when that
|
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* data is changed, use shared data references.
|
|
*
|
|
*/
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|
|
|
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/*
|
|
* XPLMDataChanged_f
|
|
*
|
|
* An XPLMDataChanged_f is a callback that the XPLM calls whenever any other
|
|
* plug-in modifies shared data. A refcon you provide is passed back to help
|
|
* identify which data is being changed. In response, you may want to call one
|
|
* of the XPLMGetDataxxx routines to find the new value of the data.
|
|
*
|
|
*/
|
|
typedef void (*XPLMDataChanged_f)(void *inRefcon);
|
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|
|
/*
|
|
* XPLMShareData
|
|
*
|
|
* This routine connects a plug-in to shared data, creating the shared data if
|
|
* necessary. inDataName is a standard path for the data ref, and inDataType
|
|
* specifies the type. This function will create the data if it does not
|
|
* exist. If the data already exists but the type does not match, an error is
|
|
* returned, so it is important that plug-in authors collaborate to establish
|
|
* public standards for shared data.
|
|
*
|
|
* If a notificationFunc is passed in and is not NULL, that notification
|
|
* function will be called whenever the data is modified. The notification
|
|
* refcon will be passed to it. This allows your plug-in to know which shared
|
|
* data was changed if multiple shared data are handled by one callback, or if
|
|
* the plug-in does not use global variables.
|
|
*
|
|
* A one is returned for successfully creating or finding the shared data; a
|
|
* zero if the data already exists but is of the wrong type.
|
|
*
|
|
*/
|
|
XPLM_API int XPLMShareData(const char *inDataName,
|
|
XPLMDataTypeID inDataType,
|
|
XPLMDataChanged_f inNotificationFunc,
|
|
void *inNotificationRefcon);
|
|
|
|
/*
|
|
* XPLMUnshareData
|
|
*
|
|
* This routine removes your notification function for shared data. Call it
|
|
* when done with the data to stop receiving change notifications. Arguments
|
|
* must match XPLMShareData. The actual memory will not necessarily be freed,
|
|
* since other plug-ins could be using it.
|
|
*
|
|
*/
|
|
XPLM_API int XPLMUnshareData(const char *inDataName,
|
|
XPLMDataTypeID inDataType,
|
|
XPLMDataChanged_f inNotificationFunc,
|
|
void *inNotificationRefcon);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|