Taking a screen shot of a window using Delphi code is rather easy.

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Taking a screen shot of a window using Delphi code is rather easy.
A screen shot (screen capture) is a copy of the screen's contents that
can be saved as a graphics file or displayed in a graphics "aware" control, for
example TImage.

In most cases you will want to take a screen shot of the active window or the
Windows Desktop.

What if you need to do a screen capture of all the running applications -
most of them will be inactive and not visible to the user?

WindowSnap - Inactive Window Screen Capture

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Delphi
Screen Capture Windows

Windows XP also introduces
the new printing API, PrintWindow. This API enables the caller to snapshot a
visual copy of a window into a device context.

Drop a TImage (named "Image1") on a form and use the following code:

The actual WindowSnap function is defined as:

uses Windows; //if not already used function WindowSnap(windowHandle: HWND; bmp: TBitmap): boolean; var r: TRect; user32DLLHandle: THandle; printWindowAPI: function(sourceHandle: HWND; destinationHandle: HDC; nFlags: UINT): BOOL; stdcall; begin result := False; user32DLLHandle := GetModuleHandle(user32) ; if user32DLLHandle <> 0 then begin @printWindowAPI := GetProcAddress(user32DLLHandle, 'PrintWindow') ; if @printWindowAPI <> nil then begin GetWindowRect(windowHandle, r) ; bmp.Width := r.Right - r.Left; bmp.Height := r.Bottom - r.Top; bmp.Canvas.Lock; try result := printWindowAPI(windowHandle, bmp.Canvas.Handle, 0) ; finally bmp.Canvas.Unlock; end; end; end; end; (*WindowSnap*)