I don't think your reply, at Re^2: Using GD on MS Windows , follows either from your original post, nor from the excellent answer, above.

Just what is it that you want to achieve?
Guesses:

• Create an image to be saved as a .png file?
• Draw a graph, live and atop the windows desktop, from some (streaming?) input data?

If the former, you have the answer above, and came close with your adaptation of the original sample code (which could be edited to specify a file write, rather than output to STDPUT which must then be redirected. If the latter, you may which to ppm -s for the various Graph:: modules.