With GDI+ image class (file #18584):

If Not "gpImage" $ Set("Procedure")
	Set Procedure To gpImage Additive
EndIf

gdip = CreateObject("gpInit")
img = CreateObject("gpImage")
img.Capture(ThisForm.hWnd)
img.SaveAsBMP("form.bmp")

>Hi Everybody,
>
>I want to capture the content of a form in a bitmap file. How may I do that?
>
>Thank you,
>Ali