Batch convert Maya files

I'm actually working on a script to convert a very basic Maya .ma scene to Nuke .nk project using Maya batch mode (mayapy.exe)

I have found how to select, search infos from camera but I don't know how to export them in a text file, as a text file with .nk extention works in Nuke. For the moment I use this to export the camera as FBX :

outputFilename = os.path.splitext(current)[0]+'.fbx'
    print "Output file: ", outputFilename

cmds.file(outputFilename, exportSelected=True, typ="FBX export", force=True, options="v=0;", es=1)

But that cant work for text file or .nk file as Maya doesn't have this option in export settings. Any idea how I can specify to write in a text file with the .nk extention ?

Thank you.

Solution

For batch conversion use a syntax like this to accomplish fbx export:

import maya.mel as mel

mel.eval('FBXExport -f "/Users/swift/Desktop/fileName";')

You'll get fileName.fbx file on your Desktop.

...or simply write what you want into .nk file...

fileName = "/Users/swift/Desktop/fileName.nk"

# pass in 'r' for reading a file
# pass in 'r+' for reading and writing a file
# pass in 'w' for overwriting the file
# pass in 'a' for appending to the file

fileWrite = open(fileName,'w')

# write here a content of .nk file
fileWrite.write('Hello, NUKE! ...blah, blah, blah...') 
fileWrite.close()

You'll get fileName.nk file on your Desktop.

For non-batch conversion use the code like this:

from pymel.core import *

fileName = fileDialog2()
print fileName[0]
fileWrite = open(fileName[0],'w')

# write here a content of .nk file
fileWrite.write('Hello, NUKE') 
fileWrite.close()
print open(fileName[0],'r').read()

In opened dialog box just type fileName with .nk extension. And you'll get .nk ASCII file.