how to use gdk_image_get(..)?

This one drives me crazy!!!   =:-(

|I don't know what is wrong about that:

window1 is a GtkWindow and has been realized by

1.  GdkImage *image;

3.  image=gdk_image_get(window1->window,0,0,100,100);

Always failed on step 3, show error message:
    Gdk-ERROR **: BadMatch (invalid parameter attributes)
      serial 127 error_code 8 request_code 73 minor_code 0

I wonder why???
If somebody knows, please tell me ASAP!!, thanks!!!

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