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message loop

Started by idinkin May 7, 2004 at 1:34 PM 4 replies 1k views

Original Post

May 7, 2004 at 1:34 PM

while(!bDone)
	{
		if(PeekMessage(&msg,NULL,0,0,PM_NOREMOVE))
		{
			if(msg.message==WM_QUIT)
			{
				bDone=TRUE;
			}
			else
			{
				TranslateMessage(&msg);
				DispatchMessage(&msg);
			}
		}
		else
		{
			if(keys[VK_ESCAPE]) //<------- o_O
			{
				bDone=TRUE;
			}
			else
			{
				DrawScene();
				SwapBuffers(hDC);
			}
		}
	}

The problem is the program never gets to the pointed line. And when I start the application it uses 90% of my CPU... The only way not to get there is to have an infinite number of messages in the queue but why????

It does not matter what you will reach in your life, but the way you will reach it

Oluseyi

526

Oluseyi

May 7, 2004 at 2:10 PM

With PM_NOREMOVE you''ll be handling the same message - whichever is sent to the applications various message queues first - forever. With a NULL HWND parameter, there''s no need to test msg.message separately; use the return value of PeekMessage to determine when to exit the loop.

Obviously, because PeekMessage returns a non-zero value when there''s a message waiting, that portion of the loop will always get executed while the else clause never does.

As for using 99% of CPU, PeekMessage doesn''t block. Any insistently executing loop will max out CPU load.

idinkin

Author

idinkin

May 7, 2004 at 2:16 PM

Thanks, now it works...
But I have another problem - I have got very low fps...
I think 0.1 fps and I don't draw anything. Why?

It does not matter what you will reach in your life, but the way you will reach it

[edited by - idinkin on May 7, 2004 3:17:47 PM]

idinkin

Author

idinkin

May 8, 2004 at 12:21 AM

I tried running the glExtensionViewer tests and I have got 0 fps in each of them. I've seen only the first frames of those. NeHe tutorials are running the same. What might be the problem?

[edited by - idinkin on May 8, 2004 1:22:55 AM]

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