From my application's code, I need to know if my app is the active app of
the system at that moment (that is, the app that has the "focus"). I browsed
the Win32 API documentation, but didn't find a function that returned the
active app.
Does anyone know how can I achieve this?

Thanks in advance,

Leonardo Bosi
Proximity Soft
Buenos Aires, Argentina
--------------------------------------------

http://www.*-*-*.com/

Try the GetForegroundWindow() API.

Declare Function GetForegroundWindow Lib "user32" Alias "GetForegroundWindow" ()
As Long

You can check if your app is active like this:

If MyForm.hWnd = GetForegroundWindow() then
    'App is active
  Else
    'Some other app is active
End if

Also, you can subclass your window and process the WM_ACTIVATEAPP message to
find when your app is being activated or deactivated.

Regards,
               Stoil

You could use the GetForegroundWindow api and compare the returned handle
with your form's handle.  Also you may need to use the GetParent api on the
returned handle (not sure), if the returned handle is a child window, then
compare the window's handle with your form's handle.

Bill