Kbase P88915: Windows are Transparent Until Moved
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/16/2008 |
|
Status: Unverified
FACT(s) (Environment):
OpenEdge 10.x
SYMPTOM(s):
Window initially appears as transparent
The edge of the window is correctly drawn but the frame and widgets are not shown
If the window is then moved the display is correct
CAUSE:
Using the LockWindowUpdate API in the application but with the wrong definition:
PROCEDURE LockWindowUpdate EXTERNAL "USER32.DLL":
DEFINE INPUT PARAMETER intWindowHwnd AS SHORT NO-UNDO. /* incorrect data type */
DEFINE RETURN PARAMETER intResult AS LONG NO-UNDO.
END PROCEDURE.
FIX:
Ensure the API has the correct data types, for this API it should be:
PROCEDURE LockWindowUpdate EXTERNAL "USER32.DLL":
DEFINE INPUT PARAMETER intWindowHwnd AS LONG NO-UNDO.
DEFINE RETURN PARAMETER intResult AS LONG NO-UNDO.
END PROCEDURE.