Получение изображения экрана

Code:

unit ScrnCap;

interface

uses

WinTypes, WinProcs, Forms, Classes, Graphics, Controls;

{ Копирует прямоугольную область экрана }

function CaptureScreenRect(ARect : TRect) : TBitmap;

{ Копирование всего экрана }

function CaptureScreen : TBitmap;

{ Копирование клиентской области формы или элемента }

function CaptureClientImage(Control : TControl) : TBitmap;

{ Копирование всей формы элемента }

function CaptureControlImage(Control : TControl) : TBitmap;

implementation

function GetSystemPalette : HPalette;

var

PaletteSize : integer;

LogSize : integer;

LogPalette : PLogPalette;

DC : HDC;

Focus : HWND;

begin

result:=0;

Focus:=GetFocus;

DC:=GetDC(Focus);

try

   PaletteSize:=GetDeviceCaps(DC, SIZEPALETTE);

   LogSize:=SizeOf(TLogPalette)+(PaletteSize-1)*SizeOf(TPaletteEntry);

   GetMem(LogPalette, LogSize);

   try

     with LogPalette^ do

     begin

       palVersion:=$0300;

       palNumEntries:=PaletteSize;

       GetSystemPaletteEntries(DC, 0, PaletteSize, palPalEntry);

     end;

     result:=CreatePalette(LogPalette^);

   finally

     FreeMem(LogPalette, LogSize);

   end;

finally

   ReleaseDC(Focus, DC);

end;

end;

function CaptureScreenRect(ARect : TRect) : TBitmap;

var

ScreenDC : HDC;

begin

Result:=TBitmap.Create;

with result, ARect do

begin

   Width:=Right-Left;

   Height:=Bottom-Top;

   ScreenDC:=GetDC(0);

   try

     BitBlt(Canvas.Handle, 0,0,Width,Height,ScreenDC, Left, Top, SRCCOPY );

   finally

     ReleaseDC(0, ScreenDC);

   end;

   Palette:=GetSystemPalette;

end;

end;

function CaptureScreen : TBitmap;

begin

with Screen do

   Result:=CaptureScreenRect(Rect(0,0,Width,Height));

end;

function CaptureClientImage(Control : TControl) : TBitmap;

begin

with Control, Control.ClientOrigin do

   result:=CaptureScreenRect(Bounds(X,Y,ClientWidth,ClientHeight));

end;

function CaptureControlImage(Control : TControl) : TBitmap;

begin

with Control do

   if Parent=nil then

     result:=CaptureScreenRect(Bounds(Left,Top,Width,Height))

   else

     with Parent.ClientToScreen(Point(Left, Top)) do

       result:=CaptureScreenRect(Bounds(X,Y,Width,Height));

end;

end.