Can't get screen capture to work

advanced
#1

I’m trying to take a screenshot within openframeworks but I can’t seem to get anything to work. I have the following code:

  
  
ofImage screenImg;  
	screenImg.allocate(ofGetScreenWidth(), ofGetScreenHeight(), OF_IMAGE_COLOR);  
	screenImg.grabScreen(0,0,800,600);  
	screenImg.saveImage("screenshot.png");

There is a drop in framerate when the above code is executed but it doesn’t seem to save a file?

This is on snow leopard with OF 6.1 and xcode.

#2

I can draw back the screenImg object fine so the problem must be with the saveImage function, I can’t see any errors printed to the console when I run it though.

#3

Bump still having this problem.

#4

Hi, i also tried to capture an image from OF’s background, and i just used these two lines:

ofImage savedBg;

savedBg.grabScreen(0,0,1024,ofGetScreenHeight());
savedBg.saveImage(“screenshot.png”);

however i’m just catching the BG by drawing things like beziers… hope this info helps you.

#5

Hello again. Recently I found these two functions in the openframeworks page: ofSaveScreen(String filename) and ofSaveFrame(). I haven’t used them yet, however I think they might work well.

Here’s the documentation: http://www.openframeworks.cc/documentation?detail=ofUtils#ofGetElapsedTimeMillis, you can use CTRL+F to find them, or just scroll.

#6

As long as the screen capture code is outside of the draw() function it will work.

#7

There also seems to be an example now for this, openFrameworks/examples/graphics/imageSaverExample