python/api1/py1CustomNodeFileTranslator.py

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########################################################################
# DESCRIPTION:
#
# Produces the file translator "spCustomNodeTranslator".
#
# This example implements a simple input and output file translator. The writer
# functionality of the translator searches the Maya scene for proxy nodes and
# writes out the name information to the file. The reader functionality of the
# translator simply reads the file in and displays each line.
#
# To use this file translator, first load the plug-in, then create some proxy nodes
# such as spSineNode. Then, use File > Export All to save the proxy node information
# by selecting the "Files of Type" option "spCustomNodeTranslator".
#
# You can select File > Import to read the information back in. When the file is read
# back in, output will be sent to the History panel of the Script Editor.  
# 
########################################################################

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

from builtins import next
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.resolvedFullName()
            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
                next(iterator)
            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.resolvedFullName()
            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