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# 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;
    }