How to do a screen capture

A screenshot, screen capture, or screen dump is an image taken by the computer to record the visible items displayed on the monitor or another visual output device. Usually this is a digital image taken by the host operating system or software running on the computer device, but it can also be a capture made by a camera or a device intercepting the video output of the computer.

Screenshots, screen dumps, or screen captures can be used to demonstrate a program, a particular problem a user might be having or generally when computer output needs to be shown to others or archived.

Microsoft Windows

Pressing the Print Screen key captures a screenshot of the entire desktop area, and places it in the clipboard. Pressing the combination of Alt-Print Screen captures only the current active window. Screenshots captured this way do not include the mouse pointer. By default, Windows does not save the screenshot to an image file; the user is required to paste the image into a separate imaging program (such as Microsoft Paint which is built-in) for saving. Some programs, however, particularly multiplayer online games, will automatically save screenshots in a specified folder. As of Windows XP, it is no longer possible to take screenshots of full-screen DOS windows without other software.

The print screen button uses "keybd_event" API to capture screen.

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