fileIOMsgCmd.cpp

//-
// ==========================================================================
// Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk
// license agreement provided at the time of installation or download,
// or which otherwise accompanies this software in either electronic
// or hard copy form.
// ==========================================================================
//+

/* 

        file : fileIOMsgCmd.cpp
        class: PreLoad
        ----------------------
        This is an example to demonstrate the usages of :

        MString MFileIO::beforeImportFile(MStatus*); 
        MString MFileIO::beforeOpenFile(MStatus*);
        MString MFileIO::beforeExportFile(MStatus*);
        MString MFileIO::beforeReferenceFile(MStatus*);

        Return value of MS::kSuccess indicates correct value returns
                
*/

#include <maya/MFnPlugin.h>
#include <maya/MSceneMessage.h>
#include <maya/MStatus.h>
#include <maya/MPxCommand.h>
#include <maya/MMessage.h>
#include <maya/MGlobal.h>
#include <maya/MFileIO.h>
#include <maya/MCallbackIdArray.h>


class PreLoad : public MPxCommand
{

        public:
                // callback functions.
                static void preOpenFunc(void* clientData);
                static void preImportFunc(void* clientData);
                static void preSaveFunc(void* clientData);
                static void preExportFunc(void* clientData);
                static void preReferenceFunc(void* clientData);

                virtual MStatus doIt( const MArgList& );                
                static void *creator();
                static MCallbackIdArray& getCallbackIds();

        private:
                //callback ids .. used later for removal
                static MCallbackIdArray ids;    

};



MCallbackIdArray PreLoad::ids;


// This is the call back function at Pre Import stage.
void PreLoad::preOpenFunc(void* clientData)
{
        MString msg = "FILE TO BE OPENED IS ";
        MStatus status = MS::kSuccess;

        MString file = MFileIO::beforeOpenFilename(&status);
                
        // check the status and then append accordingly
        msg +=  ( status == MS::kSuccess) ? file : "ERROR: Could not be retrieved" ;

        MGlobal::displayInfo(msg);
        
}

// This is the call back function at Pre Import stage.
void PreLoad::preImportFunc(void* clientData)
{
        MString msg = "PRE IMPORT FILE IS ";
        MStatus status = MS::kSuccess;

        MString file = MFileIO::beforeImportFilename(&status);

        // check the status and then append accordingly
        msg +=  ( status == MS::kSuccess) ? file : "ERROR: Could not be retrieved" ;
        
        MGlobal::displayInfo(msg);
}


// This is the call back function at Pre Save stage.
void PreLoad::preSaveFunc(void* clientData)
{
        MString msg = "FILE TO BE SAVED IS";
        MStatus status = MS::kSuccess;

        MString file = MFileIO::beforeSaveFilename(&status);

        //check the status and then append accordingly
        msg +=  ( status == MS::kSuccess) ? file : "ERROR: File name could not be retrieved" ;
        
        MGlobal::displayInfo(msg);
}


// This is the call back function at Pre Export stage.
void PreLoad::preExportFunc(void* clientData)
{
        MString msg = "FILE TO BE EXPORTED IS";
        MStatus status = MS::kSuccess;

        MString file = MFileIO::beforeSaveFilename(&status);

         // check the status and then append accordingly
        msg +=  ( status == MS::kSuccess) ? file : "ERROR: File name could not be retrieved" ;
        
        MGlobal::displayInfo(msg);
}


// This is the call back function at Pre Reference stage.
void PreLoad::preReferenceFunc(void* clientData)
{
        MString msg = "FILE TO BE REFERENCED IS";
        MStatus status = MS::kSuccess;

        MString file = MFileIO::beforeReferenceFilename(&status);

        //check the status and then append accordingly
        msg +=  ( status == MS::kSuccess) ? file : "ERROR: File name could not be retrieved" ;
        
        MGlobal::displayInfo(msg);
}

MStatus PreLoad::doIt( const MArgList& )
{
        MStatus status = MS::kSuccess;
        MGlobal::displayInfo("PLUGIN LOADED");

        // add the function call backs
        // and store call back ids for removal later
        ids.append(MSceneMessage::addCallback ( MSceneMessage::kBeforeOpen, preOpenFunc )) ;
        ids.append(MSceneMessage::addCallback ( MSceneMessage::kBeforeImport, preImportFunc )) ;
        ids.append(MSceneMessage::addCallback ( MSceneMessage::kBeforeSave, preSaveFunc )) ;
        ids.append(MSceneMessage::addCallback ( MSceneMessage::kBeforeExport, preExportFunc )) ;
        ids.append(MSceneMessage::addCallback ( MSceneMessage::kBeforeReference, preReferenceFunc )) ;
        
        return status ; 

}       



void* PreLoad::creator() 
{       
        return new PreLoad;
}


MCallbackIdArray& PreLoad::getCallbackIds()
{
        return ids;
}



// standard initialize and uninitialize functions


MStatus initializePlugin(MObject obj)
{
        MFnPlugin pluginFn(obj, PLUGIN_COMPANY, "6.0");

        MStatus status;
        status = pluginFn.registerCommand("fileIOMsgCmd", PreLoad::creator);

        if( !status)
                status.perror("register Command failed");

        return status;
}


MStatus uninitializePlugin ( MObject obj )
{
        MFnPlugin pluginFn(obj);
        MStatus status = MS::kSuccess;
        
        //remove call backs
        MMessage::removeCallbacks(PreLoad::getCallbackIds());
        status = pluginFn.deregisterCommand( "fileIOMsgCmd");
        
        return status;
}