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Author Topic: Why screen updates don't occur using some external Windows Controls and DLL  (Read 589 times)

PxPlus

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Windows handles screen repainting as a low priority task. Paint requests always are sent to the end of the queue and even then the request to draw/paint the screen is only done when the application itself asks for the next message from the event/message queue.

Generally the Windows version of PVXPlus will refresh the screen whenever it goes to user input, a Wait is issued, or 1000 instructions (whichever comes first).

If you are calling external DLLs they may not have a message/event processing loop to service Paint requests thus your screen may not get repainted.

As a general rule of thumb we suggest that you issue a dummy WAIT 0 prior to calling a DLL which will at least help by forcing the system to process all paint requests its screen prior the DLL call. 
« Last Edit: June 15, 2018, 06:23:37 PM by PxPlus »