>Somehow, GDI functions doesn't work in VFP. I have tried very basic
>functions like ARC,ELLIPSE etc., but couldn't got the results.
>It typically behaves like function returns .T. means it executes successfully but doesn't display the desired results on the screen.
>
>I have used this with other languages like PB and VB and runs smoothly.
>
>Anybody have idea , what could be the reason ?
>
>Thanks,
>Kaumir

I bad speak in English, but will try to explain.

GDI functions works in VFP, but you can't see results.
_Screen object has a child window where VFP display result of commands ( as ?, ?? etc.) You don't see result of paint on a screen when use a handle of a display device context retrieved by calling function GetDC() or GetDCEx() with using window handle of _Screen (main VFP window).

- First you should use function FindWindow() or GetActiveWindow() to retrieve handle of Main VFP window.

- Then it is necessary to retrieve handle of Child window you should use function ChildWindowFromPoint().

- Then, to retrieve handle of a display device context you should use function GetDC().

Sample:

declare long GetActiveWindow in win32api
declare long ChildWindowFromPoint in win32api long, long, long
declare long GetDC in win32api long
declare long ReleaseDC in win32api long, long

nhMainWindow = GetActiveWindow()
nhChildWindow = ChildWindowFromPoint( nhMainWindow, 100, 100)
nhChildDC = GetDC( nhChildWindow)
...
Now you may painting and drawing.
...
lnResult = ReleaseDC( nhChildWindow, nhChildDC)
* After painting with a common device context, the ReleaseDC function must be
* called to release the device context.

Warning:
VFP don't give without its knowledge to draw on _Screen.
So, if you anything display on the _Screen ( using of screen output commands or functions, such as ?, ?? etc.), results of functions WIN32API disappears.


Alexander Grigorjev.