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I need to port a screen capture utility to Linux.
I’m not familiar with Linux. On Windows, you can get the handle of a specific window or desktop and using BitBlt in Win32 API, you can copy the image and save it to a BMP file or even convert it to Jpeg format.
On Linux, as far as I know there are different desktop environments like KDE. Which should I target for development? Or which distribution? And also, which development environment do you suggest? I do programming in C/C++.
Using Xlib to talk to the X server works the same way regardless of your desktop environment. Retrieve a list of windows from the server, work out which one you want and hence its position and size, and use XGetImage to retrieve the image data.
IDEs are a matter of taste; there are many suggestions here.