Capture window by {xwd}

cap_win.py

#!/usr/bin/env python


import os
import sys


def main(wid):
    arg_dict = {'wid': wid}
    CMD_XWD = 'xwd -id %(wid)d -out %(wid)d.xwd' % arg_dict
    CMD_CONVERT = 'convert %(wid)d.xwd %(wid)d.png' % arg_dict
    os.system('xwininfo -id %d' % wid)
    
    print CMD_XWD
    os.system(CMD_XWD)
    print CMD_CONVERT
    os.system(CMD_CONVERT)
    
if __name__ == '__main__':
    main(int(sys.argv[1]))