Scene messages. More...

#include <MSceneMessage.h>

Inheritance diagram for MSceneMessage:

Public Types
enum	Message { kSceneUpdate, kBeforeNew, kAfterNew, kBeforeImport, kAfterImport, kBeforeOpen, kAfterOpen, kBeforeFileRead, kAfterFileRead, kAfterSceneReadAndRecordEdits, kBeforeExport, kAfterExport, kBeforeSave, kAfterSave, kBeforeReference, kAfterReference, kBeforeRemoveReference, kAfterRemoveReference, kBeforeImportReference, kAfterImportReference, kBeforeExportReference, kAfterExportReference, kBeforeUnloadReference, kAfterUnloadReference, kBeforeSoftwareRender, kAfterSoftwareRender, kBeforeSoftwareFrameRender, kAfterSoftwareFrameRender, kSoftwareRenderInterrupted, kMayaInitialized, kMayaExiting, kBeforeNewCheck, kBeforeOpenCheck, kBeforeSaveCheck, kBeforeImportCheck, kBeforeExportCheck, kBeforeLoadReference, kAfterLoadReference, kBeforeLoadReferenceCheck, kBeforeReferenceCheck, kBeforeCreateReferenceCheck = kBeforeReferenceCheck, kBeforePluginLoad, kAfterPluginLoad, kBeforePluginUnload, kAfterPluginUnload, kBeforeCreateReference, kAfterCreateReference, kExportStarted, kBeforeLoadReferenceAndRecordEdits, kAfterLoadReferenceAndRecordEdits, kBeforeCreateReferenceAndRecordEdits, kAfterCreateReferenceAndRecordEdits, kLast }
	Events to which messages can be attached. More...

Public Types inherited from MMessage
enum	Action { kDefaultAction, kDoNotDoAction, kDoAction }
	Callback result action codes. More...

typedef void(*	MBasicFunction) (void *clientData)
	Pointer to a basic callback function. More...

typedef void(*	MElapsedTimeFunction) (float elapsedTime, float lastTime, void *clientData)
	Pointer to an elapsed time callback function. More...

typedef void(*	MCheckFunction) (bool retCode, void clientData)
	Pointer to callback function which returns a true/false result. More...

typedef void(*	MCheckFileFunction) (bool retCode, MFileObject &file, void clientData)
	Pointer to a callback function which takes a file object and returns a result. More...

typedef void(*	MCheckPlugFunction) (bool retCode, MPlug &plug, void clientData)
	Pointer to a callback function which takes a plug and returns a result. More...

typedef void(*	MComponentFunction) (MUintArray componentIds[], unsigned int count, void *clientData)
	Pointer to a callback function which takes an array of component ids. More...

typedef void(*	MNodeFunction) (MObject &node, void *clientData)
	Pointer to a callback function which takes a dependency node. More...

typedef void(*	MStringFunction) (const MString &str, void *clientData)
	Pointer to callback function which takes a string. More...

typedef void(*	MTwoStringFunction) (const MString &str1, const MString &str2, void *clientData)
	Pointer to a callback function which takes two strings. More...

typedef void(*	MThreeStringFunction) (const MString &str1, const MString &str2, const MString &str3, void *clientData)
	Pointer to a callback function which takes three strings. More...

typedef void(*	MStringIntBoolIntFunction) (const MString &str, unsigned int index, bool flag, unsigned int type, void *clientData)
	Pointer to callback function which takes a string, an index, a flag and a type. More...

typedef void(*	MStringIndexFunction) (const MString &, unsigned int index, void *clientData)
	Pointer to callback function which takes a string and index. More...

typedef void(*	MNodeStringBoolFunction) (MObject &node, const MString &, bool, void *clientData)
	Pointer to a callback function which takes a node, a string and a boolean. More...

typedef void(*	MStateFunction) (bool state, void *clientData)
	Pointer to a callback function which takes a boolean state. More...

typedef void(*	MTimeFunction) (MTime &time, void *clientData)
	Pointer to callback function which takes a time. More...

typedef void(*	MPlugFunction) (MPlug &srcPlug, MPlug &destPlug, bool made, void *clientData)
	Pointer to plug connection callback function. More...

typedef void(*	MNodePlugFunction) (MObject &node, MPlug &plug, void *clientData)
	Pointer to a callback function which takes a dependency node and a plug. More...

typedef void(*	MNodeStringFunction) (MObject &node, const MString &str, void *clientData)
	Pointer to a callback function which takes a dependency node and a string. More...

typedef void(*	MParentChildFunction) (MDagPath &child, MDagPath &parent, void *clientData)
	Pointer to to a callback function which takes two DAG nodes in a parent/child relationship. More...

typedef void(*	MModifierFunction) (MDGModifier &modifier, void *clientData)
	Pointer to a callback function which takes a DG modifier. More...

typedef void(*	MStringArrayFunction) (const MStringArray &strs, void *clientData)
	Pointer to a callback function which takes a string array. More...

typedef void(*	MNodeModifierFunction) (MObject &node, MDGModifier &modifier, void *clientData)
	Pointer to a callback function which takes a dependency node and a DG modifier. More...

typedef void(*	MObjArray) (MObjectArray &objects, void *clientData)
	Pointer to a callback function which takes an array of objects. More...

typedef void(*	MNodeObjArray) (MObject &node, MObjectArray &objects, void *clientData)
	Pointer to a callback function which takes a dependency node and an array of objects. More...

typedef void(*	MStringNode) (const MString &str, MObject &node, void *clientData)
	Pointer to a callback function which takes a string and a dependency node. More...

typedef void(*	MCameraLayerFunction) (MObject &cameraSetNode, unsigned int multiIndex, bool added, void *clientData)
	Pointer to a callback function which takes a dependency node, an unsigned integer, and a boolean value. More...

typedef void(*	MCameraLayerCameraFunction) (MObject &cameraSetNode, unsigned int multiIndex, MObject &oldCamera, MObject &newCamera, void *clientData)
	Pointer to a callback function which takes a dependency node, an unsigned integer, and two camera transform nodes. More...

typedef void(*	MConnFailFunction) (MPlug &srcPlug, MPlug &destPlug, const MString &srcPlugName, const MString &dstPlugName, void *clientData)
	Pointer to connection-failed callback function. More...

typedef void(*	MPlugsDGModFunction) (MPlugArray &plugs, MDGModifier &modifier, void *clientData)
	Pointer to a callback function which takes an array of MPlugs and an MDGModifier. More...

typedef void(*	MNodeUuidFunction) (MObject &node, const MUuid &uuid, void *clientData)
	Pointer to a callback function which takes a dependency node and a UUID. More...

typedef Action(*	MCheckNodeUuidFunction) (bool doAction, MObject &node, MUuid &uuid, void *clientData)
	Pointer to a callback function which takes a dependency node and a UUID, and returns a result. More...

typedef void(*	MObjectFileFunction) (const MObject &object, const MFileObject &file, void *clientData)
	Pointer to a callback function which takes an object and a file object. More...

typedef void(*	MCheckObjectFileFunction) (bool retCode, const MObject &referenceNode, MFileObject &file, void clientData)
	Pointer to a callback function which takes an object and a file object and returns a result. More...

typedef void(*	MRenderTileFunction) (int originX, int originY, int tileMaxX, int tileMaxY, const void *tileData)
	Pointer to a callback function which receives origin, size and image data. More...

Static Public Member Functions
static MCallbackId	addCallback (Message msg, MMessage::MBasicFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	Adds a new callback for the specified scene message. More...

static MCallbackId	addCheckCallback (Message msg, MMessage::MCheckFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	This function adds a new callback for the specified scene message. More...

static MCallbackId	addCheckFileCallback (Message msg, MMessage::MCheckFileFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	This function adds a new callback for the specified scene message. More...

static MCallbackId	addStringArrayCallback (Message msg, MMessage::MStringArrayFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	Adds a new callback which takes a string array argument, in addition to the usual clientData. More...

static MCallbackId	addReferenceCallback (Message msg, MMessage::MObjectFileFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	This function adds a new callback for the specified scene message. More...

static MCallbackId	addCheckReferenceCallback (Message msg, MMessage::MCheckObjectFileFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	This function adds a new callback for the specified scene message. More...

static MCallbackId	addConnectionFailedCallback (MMessage::MConnFailFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	This method registers a callback that is called when a connection was unable to be made. More...

static MCallbackId	addNamespaceRenamedCallback (MMessage::MTwoStringFunction func, void clientData=NULL, MStatus ReturnStatus=NULL)
	This method registers a callback that is called when a namespace is renamed. More...

static const char *	className ()
	Returns the name of this class. More...

static MCallbackId	addCallback (Message, void(func)(bool retCode, void clientData), void clientData=NULL, MStatus *ReturnStatus=NULL)
	This method is obsolete. More...

static MCallbackId	addCallback (Message, void(func)(bool retCode, MFileObject &file, void clientData), void clientData=NULL, MStatus *ReturnStatus=NULL)
	This method is obsolete. More...

static MCallbackId	addCallback (Message, void(func)(const MStringArray &, void ), void clientData, MStatus ReturnStatus)
	This method is obsolete. More...

Static Public Member Functions inherited from MMessage
static MStatus	removeCallback (MCallbackId id)
	Remove the specified callback from maya. More...

static MStatus	removeCallbacks (MCallbackIdArray &ids)
	Remove all of the specified callbacks from maya. More...

static MCallbackId	currentCallbackId (MStatus *ReturnStatus=NULL)
	Return the callback ID of the currently executing callback. More...

static MStatus	nodeCallbacks (MObject &node, MCallbackIdArray &ids)
	Returns a list of callback IDs associated registered to a given node. More...

static void	setRegisteringCallableScript ()
	Mark this MMessage object as one that will be passed callbacks defined in script.

static bool	registeringCallableScript ()
	Return true if this MMessage object has its callbacks defined in script.

static void	stopRegisteringCallableScript ()
	Stop this MMessage object from being passed. More...

static const char *	className ()
	Returns the name of this class. More...

static MStatus	removeCallbacks (MIntArray &ids)
	This method is obsolete. More...

static MStatus	nodeCallbacks (MObject &node, MIntArray &ids)
	This method is obsolete. More...

Detailed Description

Scene messages.

This class is used to register callbacks for scene related messages.

The addCallback method registers a function that will be executed whenever the specified message occurs. An id is returned and is used to remove the callback.

To remove a callback use MMessage::removeCallback. All callbacks that are registered by a plug-in must be removed by that plug-in when it is unloaded. Failure to do so will result in a fatal error.

Member Enumeration Documentation

enum Message

Events to which messages can be attached.

Enumerator
kSceneUpdate	Called after any operation that changes which files are loaded.
kBeforeNew	Called before a File > New operation.
kAfterNew	Called after a File > New operation.
kBeforeImport	Called before a File > Import operation.
kAfterImport	Called after a File > Import operation.
kBeforeOpen	Called before a File > Open operation.
kAfterOpen	Called after a File > Open operation.
kBeforeFileRead	Called immediately before any file read operation (open, import or reference) and while reading state (MFileIO::isReadingFile) is true.
kAfterFileRead	Called immediately after any file read operation (open, import or reference) and while reading state (MFileIO::isReadingFile) is true.
kAfterSceneReadAndRecordEdits	Call once after any file operation (open, import or reference) with reference edits recorded during the execution of the callback Note, isReadingFile is false during this callback.
kBeforeExport	Called before a File > Export operation.
kAfterExport	Called after a File > Export operation.
kBeforeSave	Called before a File > Save (or SaveAs) operation.
kAfterSave	Called after a File > Save (or SaveAs) operation.
kBeforeReference	Called before a File > Reference operation. Deprecated. Use kBeforeCreateReference/kBeforeLoadReference.
kAfterReference	Called after a File > Reference operation. Deprecated. Use kAfterCreateReference/kAfterLoadReference.
kBeforeRemoveReference	Called before a File > RemoveReference operation.
kAfterRemoveReference	Called after a File > RemoveReference operation.
kBeforeImportReference	Called before a File > ImportReference operation.
kAfterImportReference	Called after a File > ImportReference operation.
kBeforeExportReference	Called before a File > ExportReference operation.
kAfterExportReference	Called after a File > ExportReference operation.
kBeforeUnloadReference	Called before a File > UnloadReference operation.
kAfterUnloadReference	Called after a File > UnloadReference operation.
kBeforeSoftwareRender	Called before a Software Render begins.
kAfterSoftwareRender	Called after a Software Render ends.
kBeforeSoftwareFrameRender	Called before each frame of a Software Render.
kAfterSoftwareFrameRender	Called after each frame of a Software Render.
kSoftwareRenderInterrupted	Called when an interactive render is interrupted by the user.
kMayaInitialized	Called on interactive or batch startup after initialization.
kMayaExiting	Called just before Maya exits.
kBeforeNewCheck	Called prior to File > New operation, allows user to cancel action.
kBeforeOpenCheck	Called prior to File > Open operation, allows user to cancel action.
kBeforeSaveCheck	Called prior to File > Save operation, allows user to cancel action.
kBeforeImportCheck	Called prior to File > Import operation, allows user to cancel action.
kBeforeExportCheck	Called prior to File > Export operation, allows user to cancel action.
kBeforeLoadReference	Called before a File > LoadReference operation.
kAfterLoadReference	Called after a File > LoadReference operation.
kBeforeLoadReferenceCheck	Called before a File > LoadReference operation, allows user to cancel action.
kBeforeReferenceCheck	Called prior to a File > CreateReference operation, allows user to cancel action. Deprecated. Use kBeforeCreateReferenceCheck.
kBeforeCreateReferenceCheck	Called prior to a File > CreateReference operation, allows user to cancel action.
kBeforePluginLoad	Called prior to a plugin being loaded.
kAfterPluginLoad	Called after a plugin is loaded.
kBeforePluginUnload	Called prior to a plugin being unloaded.
kAfterPluginUnload	Called after a plugin is unloaded.
kBeforeCreateReference	Called before a File > CreateReference operation.
kAfterCreateReference	Called after a File > CreateReference operation.
kExportStarted	Called at the start of a File > Export operation, after the export file has become the active file.
kBeforeLoadReferenceAndRecordEdits	Same as kBeforeLoadReference except reference edits are recorded during the execution of the callback.
kAfterLoadReferenceAndRecordEdits	Same as kAfterLoadReference except reference edits are recorded during the execution of the callback.
kBeforeCreateReferenceAndRecordEdits	Same as kBeforeCreateReference except reference edits are recorded during the execution of the callback.
kAfterCreateReferenceAndRecordEdits	Same as kAfterCreateReference except reference edits are recorded during the execution of the callback.
kLast	Last value of the enum.

Member Function Documentation

OPENMAYA_MAJOR_NAMESPACE_OPEN MCallbackId addCallback	(	MSceneMessage::Message	msg,
		MMessage::MBasicFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

Adds a new callback for the specified scene message.

If a 'before' message is sent, the corresponding 'after' message will be as well.

Callbacks can be added to the following messages with this function:

kSceneUpdate
kBeforeNew
kAfterNew
kBeforeImport
kAfterImport
kBeforeOpen
kAfterOpen
kBeforeFileRead
kAfterFileRead
kAfterSceneReadAndRecordEdits
kBeforeExport
kExportStarted
kAfterExport
kBeforeSave
kAfterSave
kBeforeCreateReference
kBeforeCreateReferenceAndRecordEdits
kAfterCreateReference
kAfterCreateReferenceAndRecordEdits
kBeforeRemoveReference
kAfterRemoveReference
kBeforeImportReference
kAfterImportReference
kBeforeExportReference
kAfterExportReference
kBeforeUnloadReference
kAfterUnloadReference
kBeforeLoadReference
kBeforeLoadReferenceAndRecordEdits
kAfterLoadReference
kAfterLoadReferenceAndRecordEdits
kBeforeSoftwareRender
kAfterSoftwareRender
kBeforeSoftwareFrameRender
kAfterSoftwareFrameRender
kSoftwareRenderInterrupted
kMayaInitialized
kMayaExiting

Note that for referencing, the creation of the reference (i.e. creation of the reference node and associated structures) is separate from the loading of the reference itself (i.e. read the nodes from file).

The kBeforeCreateReference message will be sent when a reference is created. So it will happen for both loaded and unloaded references. But the kBeforeLoadReference message will only be sent when the file is read from disk.

When opening a file with a loaded reference, the callback order is as follows,

kBeforeCreateReference
kBeforeCreateReferenceAndRecordEdits
kAfterCreateReference
kAfterCreateReferenceAndRecordEdits

kBeforeLoadReference
kBeforeLoadReferenceAndRecordEdits
kAfterLoadReference
kAfterLoadReferenceAndRecordEdits

By default, edits to referenced objects will not be recorded during the execution of file I/O callbacks. A specific set of callbacks are provided that will enable the recording of reference edits during their execution as follows,

kAfterSceneReadAndRecordEdits
kBeforeCreateReferenceAndRecordEdits
kAfterCreateReferenceAndRecordEdits
kBeforeLoadReferenceAndRecordEdits
kAfterLoadReferenceAndRecordEdits

The kExportStarted callback is sent after the kBeforeExport callback, once Maya has actually started to process the exported data. One important difference between the two callbacks is that the fileInfo command affects the exported scene when used in the kExportStarted callback, but affects the current scene in memory when used in the kBeforeExport callback.

Parameters

[in]	msg	the scene message that will trigger the callback
[in]	func	the callback function clientData User defined data passed to the callback function
[in]	clientData	user data that will be passed to the callback function
[out]	ReturnStatus	Status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

Examples:: autoLoader/autoLoader.cpp, cgFx/pluginMain.cpp, dx11Shader/dx11Shader.cpp, dx11Shader/dx11ShaderCompileHelper.cpp, fileIOMsgCmd/fileIOMsgCmd.cpp, glslShader/GLSLShader.cpp, gpuCache/gpuCacheSubSceneOverride.cpp, gpuCache/gpuCacheVBOProxy.cpp, and hlslShader/hlslShader.cpp.

MCallbackId addCheckCallback	(	MSceneMessage::Message	msg,
		MMessage::MCheckFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

This function adds a new callback for the specified scene message.

The callback will have the ability to abort the current operation by returning false through its 'retCode' parameter.

NOTE: The check message is sent out before the equivalent non-check type. As a result, if the check message aborts the operation, the equivalent non-check message type will not be sent.

Callbacks can be added to the following messages with this function:

kBeforeNewCheck
kBeforeImportCheck
kBeforeOpenCheck
kBeforeExportCheck
kBeforeSaveCheck
kBeforeCreateReferenceCheck
kBeforeLoadReferenceCheck

Parameters

[in]	msg	the scene message that will trigger the callback
[in]	func	the callback function retCode boolean passed in to the callback function. In case of error, the callback function should set this to false. clientData User defined data passed to the callback function
[in]	clientData	user data that will be passed to the callback function
[out]	ReturnStatus	Status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

MCallbackId addCheckFileCallback	(	MSceneMessage::Message	msg,
		MMessage::MCheckFileFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

This function adds a new callback for the specified scene message.

This callback has the option to abort the current operation by setting the retCode parameter to false. The file parameter stores the target file for the current file IO operation, by modifying this file parameter the target file will be changed as well.

NOTE: The check message is sent out before the equivalent non-check type. As a result, if the check message aborts the operation, the equivalent non-check message type will not be sent.

Callbacks can be added to the following messages with this function:

kBeforeImportCheck
kBeforeOpenCheck
kBeforeExportCheck
kBeforeCreateReferenceCheck
kBeforeLoadReferenceCheck

Parameters

[in]	msg	the scene message that will trigger the callback
[in]	func	the callback function retCode boolean passed in to the callback function. In case of error, the callback function should set this to false. file MFileObject passed in to the callback function. This is the MFileObject that will be acted on by the current file IO operation, any modifications to it will be passed back to Maya and change the file being acted on. clientData User defined data passed to the callback function
[in]	clientData	user data that will be passed to the callback function
[out]	ReturnStatus	Status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

MCallbackId addStringArrayCallback	(	MSceneMessage::Message	msg,
		MMessage::MStringArrayFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

Adds a new callback which takes a string array argument, in addition to the usual clientData.

The messages which can be used with this method and the contents of the string array passed to their callbacks are as follows:

kBeforePluginLoad - path to plug-in file
kAfterPluginLoad - path to plug-in file, name of plug-in
kBeforePluginUnload - name of plug-in
kAfterPluginUnload - name of plug-in, path to plug-in file

To allow for future expansion callbacks should not rely on the number of array elements being exactly as given above. While there will not be fewer elements than given above, there may in future be more.

Parameters

[in]	msg	the scene message that will trigger the callback
[in]	func	the callback function strs immutable array of strings clientData User defined data passed to the callback function
[in]	clientData	user data that will be passed to the callback function
[out]	ReturnStatus	Status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

Examples:: pluginCallbacks/pluginCallbacks.cpp.

MCallbackId addReferenceCallback	(	MSceneMessage::Message	msg,
		MMessage::MObjectFileFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

This function adds a new callback for the specified scene message.

Callbacks can be added to the following messages with this function:

kBeforeRemoveReference
kBeforeImportReference
kBeforeUnloadReference
kAfterUnloadReference
kBeforeLoadReference
kAfterLoadReference
kAfterCreateReference
kAfterCreateReferenceAndRecordEdits
kBeforeLoadReferenceAndRecordEdits
kAfterLoadReferenceAndRecordEdits

Parameters

[in]	msg	the scene message that will trigger the callback
[in]	func	the callback function referenceNode The reference node. file The resolved file path of the referenced file. clientData User defined data passed to the callback function
[in]	clientData	user data that will be passed to the callback function
[out]	ReturnStatus	Status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

MCallbackId addCheckReferenceCallback	(	MSceneMessage::Message	msg,
		MMessage::MCheckObjectFileFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

This function adds a new callback for the specified scene message.

The callback will have the ability to abort the current operation by returning false through its 'retCode' parameter.

NOTE: The check message is sent out before the equivalent non-check type. As a result, if the check message aborts the operation, the equivalent non-check message type will not be sent.

Callbacks can be added to the following messages with this function:

kBeforeLoadReferenceCheck

Parameters

[in]	msg	the scene message that will trigger the callback
[in]	func	the callback function retCode boolean passed in to the callback function. In case of error, the callback function should set this to false. referenceNode The reference node. file The resolved file path of the referenced file. clientData User defined data passed to the callback function
[in]	clientData	user data that will be passed to the callback function
[out]	ReturnStatus	Status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

MCallbackId addConnectionFailedCallback	(	MMessage::MConnFailFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

This method registers a callback that is called when a connection was unable to be made.

Currently, the callback is only triggered during the reading of files (.ma or .mb) or of edits files (.editMA or .editMB files created by Maya's offline file support). The most common reasons why a connection would fail are:

inability to find the specified node or attribute names, or
a conflicting existing connection

Parameters

[in]	func	the callback function srcPlug Source plug of the connection (or a NULL plug if it could not be found) destPlug Destination plug of the connection (or a NULL plug if it could not be found) srcPlugName Name used to look up the source plug. dstPlugName Name used to look up the destination plug. clientData User defined data passed to the callback function
[in]	clientData	User defined data passed to the callback function
[out]	ReturnStatus	status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

Examples:: atomImportExport/atomImportExport.cpp.

MCallbackId addNamespaceRenamedCallback	(	MMessage::MTwoStringFunction	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

This method registers a callback that is called when a namespace is renamed.

Parameters

[in]	func	the callback function nsNew New name of namespace that was changed nsOld Old name of namespace that was changed clientData User defined data passed to the callback function
[in]	clientData	User defined data passed to the callback function
[out]	ReturnStatus	status code

Returns: Identifier used for removing the callback.

Status Codes:

MS::kSuccess Operation succeeded
MS::kInsufficientMemory No memory available
MS::kFailure Error adding callback

const char * className ( )

static

Returns the name of this class.

Returns: The name of this class.

MCallbackId addCallback	(	MSceneMessage::Message	msg,
		void()(bool retCode, void *clientData)	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)

static

This method is obsolete.

This method is obsolete. This method is not available in Python.

[From Maya 2019]

Deprecated:: Use the MSceneMessage::addCheckCallback() method instead.

Deprecated:: Use the MSceneMessage::addCheckCallback() method instead.

Parameters

[in]	msg
[in]	func
[in]	clientData
[out]	ReturnStatus

MCallbackId addCallback	(	MSceneMessage::Message	msg,
		void()(bool retCode, MFileObject &file, void *clientData)	func,
		void *	clientData = `NULL`,
		MStatus *	ReturnStatus = `NULL`
	)