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# customNodeFileTranslator.py

    #-
    # ==========================================================================
    # Copyright (C) 1995 - 2006 Autodesk, Inc. and/or its licensors.  All
    # rights reserved.
    #
    # The coded instructions, statements, computer programs, and/or related
    # material (collectively the "Data") in these files contain unpublished
    # information proprietary to Autodesk, Inc. ("Autodesk") and/or its
    # licensors, which is protected by U.S. and Canadian federal copyright
    # law and by international treaties.
    #
    # The Data is provided for use exclusively by You. You have the right
    # to use, modify, and incorporate this Data into other products for
    # purposes authorized by the Autodesk software license agreement,
    # without fee.
    #
    # The copyright notices in the Software and this entire statement,
    # including the above license grant, this restriction and the
    # following disclaimer, must be included in all copies of the
    # Software, in whole or in part, and all derivative works of
    # the Software, unless such copies or derivative works are solely
    # in the form of machine-executable object code generated by a
    # source language processor.
    #
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
    # AUTODESK DOES NOT MAKE AND HEREBY DISCLAIMS ANY EXPRESS OR IMPLIED
    # WARRANTIES INCLUDING, BUT NOT LIMITED TO, THE WARRANTIES OF
    # NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
    # PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE, OR
    # TRADE PRACTICE. IN NO EVENT WILL AUTODESK AND/OR ITS LICENSORS
    # BE LIABLE FOR ANY LOST REVENUES, DATA, OR PROFITS, OR SPECIAL,
    # DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES, EVEN IF AUTODESK
    # AND/OR ITS LICENSORS HAS BEEN ADVISED OF THE POSSIBILITY
    # OR PROBABILITY OF SUCH DAMAGES.
    #
    # ==========================================================================
    #+

    # import maya
    # maya.cmds.loadPlugin("customNodeFileTranslator.py")

    import math, sys

    import maya.OpenMaya as OpenMaya
    import maya.OpenMayaMPx as OpenMayaMPx

    kPluginTranslatorTypeName = "spCustomNodeTranslator"

    # Node definition
    class customNodeTranslator(OpenMayaMPx.MPxFileTranslator):
        def __init__(self):
            OpenMayaMPx.MPxFileTranslator.__init__(self)
        def haveWriteMethod(self):
            return True
        def haveReadMethod(self):
            return True
        def filter(self):
            return "*.spcnt"
        def defaultExtension(self):
            return "spcnt"
        def writer( self, fileObject, optionString, accessMode ):
            #
            try:
                fullName = fileObject.fullName()
                fileHandle = open(fullName,"w")
                fileHandle.write("# Simple text file of custom node information\n")

                iterator=OpenMaya.MItDependencyNodes()
                while not iterator.isDone():
                    object = iterator.thisNode()
                    #
                    try:
                        dnFn = OpenMaya.MFnDependencyNode( object )
                        userNode = dnFn.userNode()
                        if ( not( userNode == None ) ):
                            line = "# custom node: " + dnFn.name() + "\n"
                            fileHandle.write(line)
                    except:
                        pass
                    iterator.next()
                fileHandle.close()
            except:
                sys.stderr.write( "Failed to write file information\n")
                raise
        def processLine( self, lineStr ):
            # Normally do parsing here.  Simple example will only
            # print out the line.
            print "read <%s>" % lineStr
        def reader( self, fileObject, optionString, accessMode ):
            #
            try:
                fullName = fileObject.fullName()
                fileHandle = open(fullName,"r")
                for line in fileHandle:
                    # print line
                    self.processLine( line )
                    # print "1"
                fileHandle.close()
            except:
                sys.stderr.write( "Failed to read file information\n")
                raise

    # creator
    def translatorCreator():
        return OpenMayaMPx.asMPxPtr( customNodeTranslator() )

    # initialize the script plug-in
    def initializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
            mplugin.registerFileTranslator( kPluginTranslatorTypeName, None, translatorCreator )
        except:
            sys.stderr.write( "Failed to register translator: %s" % kPluginTranslatorTypeName )
            raise

    # uninitialize the script plug-in
    def uninitializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
            mplugin.deregisterFileTranslator( kPluginTranslatorTypeName )
        except:
            sys.stderr.write( "Failed to deregister translator: %s" % kPluginTranslatorTypeName )
            raise