Originally posted by Disch

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the WM_KEYDOWN repeat rate is one of the user preferences set in Windows (the speed can be changed in one of the control panels), so no, you're program can't (or at least shouldn't) try to change the speed at which WM_KEYDOWN messages are sent.

The obvious solution here sounds to me like you should just not process WM_KEYDOWN messages if your program is too far behind. This could be done by doing some checks in your message pump:

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MSG msg;
int ok_to_sleep;
while( program_open )
{
ok_to_sleep = 1;
while( PeekMessage( your_wnd, &msg, 0, 0, PM_REMOVE) )
{
TranslateMessage(&msg);
DispatchMessage(&msg);
ok_to_sleep = 0;
}

program_busy = 0; // queue is clear, program is no longer busy

if(ok_to_sleep)
Sleep(1);
}


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Then in your ChangePipeSets function or whatever.. just do a check to see if the program is busy before continuing:

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void ChangePipeSets()
{
if(program_busy) return; //abort, program is too busy

program_busy = 1; //this will make the program busy

// do the rest of the work here
}


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