Dynamic Output File Naming - Screen Capture

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Hello, I have a loop for some image processing and at the end of the each loop, I have to take a screenshot of Matlab. (for my case, imwrite or saveas functions are not applicable for me, that's why I have to use screen capture.)

For this, I've found the following Java-based code;

http://www.mathworks.com/matlabcentral/fileexchange/11363-screencapture

robo = java.awt.Robot;
t = java.awt.Toolkit.getDefaultToolkit();
rectangle = java.awt.Rectangle(t.getScreenSize());
image = robo.createScreenCapture(rectangle);
filehandle = java.io.File('screencapture.jpg');
javax.imageio.ImageIO.write(image,'jpg',filehandle);
imageview('screencapture.jpg');

I have a basic loop of i.e. 'for i=1:N' and I need to create output files with the "i" name of the loop i.e. for 1st loop, output name should be "1.jpg", second "2.jpg"... etc.

I will be very faithful if you can guide me on this. Thank you very much in advance.