Quick Screen Capture in MFC?

I've got a screen capture method that captures the screen and saves to a BMP but it seems slow. That is to say, it works fine for the first 2 screen capture events but for the next 2 it doesn't capture the updates, but rather captures the same previous image.

Does anybody have a handy-dandy real fast screen capture to BMP method?

Thanks in advance!

I just wanted to follow up.

This isn't my posting, but this is exactly the same problem that I'm having:
http://stackoverflow.com/questions/4...235308#7235308

It appears that the code isn't slow, it's a matter of 'thread synchronization'.

Specifically, my code looks like this:

Invalidate(true);
CaptureScreen(ScreenCounter);

And the screen capture is happening before the screen is 'rebuilt' from the Invalidate.

How do I ensure that that CaptureScreen is called only after Invalidate(true) is finished?

Thanks!

How do you know when Invalidate(true) is done? (yeah, I know, the screen has been updated).

The problem that I'm having is this code:

Invalidate(true);
CaptureScreen(ScreenCounter);

Unfortunately, the screen capture is happening BEFORE the screen has been updated. Is there some way that I can force a 'wait' until Invalidate(true) is done?

Why are you starting duplicate threads?

Invalidate(TRUE);
UpdateWindow();
CaptureScreen(ScreenCounter);

Thanks! That worked a charm!

Sorry about the duplicate threads. My first thread was about a screen capture, and the second was more specific.

Again, sorry about the duplicate threads.

Really appreciate the help.

Try to call UpdateWindow after your Invalidate.

[ merged threads ]

Quote:

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Originally Posted by zetar

I just wanted to follow up.

This isn't my posting, but this is exactly the same problem that I'm having:
http://stackoverflow.com/questions/4...235308#7235308

It appears that the code isn't slow, it's a matter of 'thread synchronization'.

Specifically, my code looks like this:

Invalidate(true);
CaptureScreen(ScreenCounter);

And the screen capture is happening before the screen is 'rebuilt' from the Invalidate.

How do I ensure that that CaptureScreen is called only after Invalidate(true) is finished?

Thanks!

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but it seems don't work when the surface show in overlay.