How to take a screenshot of a specific monitor?

This procedure snaps a screenshot of a given monitor, and optionally includes the mouse cursor.

Bitmap: Any TBitmap which you want the screenshot written to
MonitorNum: Index of monitor (0 = main)
DrawCursor: Whether or not to draw mouse cursor
Quality: Pixel Format (pf24bit recommended)

[code Delphi]
procedure ScreenShot(var Bitmap: TBitmap; const MonitorNum: Integer;
const DrawCursor: Boolean; const Quality: TPixelFormat);
var
DC: HDC;
C: TCanvas;
R: TRect;
CursorInfo: TCursorInfo;
Icon: TIcon;
IconInfo: TIconInfo;
M: TMonitor;
CP: TPoint;
begin
M:= Screen.Monitors[MonitorNum];
DC:= GetDC(GetDesktopWindow);
try
C:= TCanvas.Create;
try
C.Handle:= DC;
R:= M.BoundsRect;
Bitmap.Width:= R.Width;
Bitmap.Height:= R.Height;
Bitmap.PixelFormat:= Quality;
Bitmap.Canvas.CopyRect(Rect(0,0,R.Width,R.Height), C, R);
finally
C.Free;
end;
finally
ReleaseDC(GetDesktopWindow, DC);
end;
if DrawCursor then begin
R:= Bitmap.Canvas.ClipRect;
Icon:= TIcon.Create;
try
CursorInfo.cbSize:= SizeOf(CursorInfo);
if GetCursorInfo(CursorInfo) then
if CursorInfo.Flags = CURSOR_SHOWING then
begin
Icon.Handle:= CopyIcon(CursorInfo.hCursor);
if GetIconInfo(Icon.Handle, IconInfo) then
begin
CP:= CursorInfo.ptScreenPos;
CP.X:= CP.X - M.Left;
CP.Y:= CP.Y - M.Top;
Bitmap.Canvas.Draw(
CP.X - Integer(IconInfo.xHotspot) - R.Left,
CP.Y - Integer(IconInfo.yHotspot) - R.Top,
Icon);
end;
end;
finally
Icon.Free;
end;
end;
end;
[/code]