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Graphical User Interface

I'm in a loop and my app is not responding. What do I do? by hilfy
Posted: 3 Mar 04

You're processing data in a loop and you expect to have any of the following happen:

- Response to a mouse-click (on a button or elsewhere).
- Draw something on the screen.
- Change a label.
- Change a mouse pointer.

But the program won't respond or do any of the above.(There may be other actions as well...)

Add the line:


to your program, somewhere in the loop.  This will give Windows a chance to process any messages for your application.

However, this can/will also slow processing in your loop.  If speed is an issue, you can also include a counter and only call ProcessMessages every so many iterations through the loop.  Something like this (i is an Integer variable):

If i = 100 then
  i := 1;

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