Grabbing Screen Shots from FLTK 1.1.1 window

I have a FLTK window with contains widgets and a OpenGL window. I currently can create tga screen shots of the OpenGL window using glReadPixels, however i now want to include the surrounding FLTK GUI window in the screen shot, is there something similar to glReadPixels for use with FLTK windows?

ps i can just use printscreen or similar, as im making a mpeg demo of my program so need several screen shots per second

ta

Neil W

Sorry correction

i can’t just use print screen