Delphi实现截屏存盘的方法

procedure TForm1.ScreenCap(LeftPos,TopPos,RightPos,BottomPos:integer);var RectWidth,RectHeight:integer; SourceDC,DestDC,Bhandle:integer; Bitmap:TBitmap; MyJpeg: TJpegImage; Stream:TMemoryStream;begin MyJpeg:= TJpegImage.Create; RectWidth:=RightPos-LeftPos; RectHeight:=BottomPos-TopPos; SourceDC:=CreateDC('DISPLAY','','',nil); DestDC:=CreateCompatibleDC(SourceDC); Bhandle:=CreateCompatibleBitmap(SourceDC, RectWidth,RectHeight); SelectObject(DestDC,Bhandle); BitBlt(DestDC,0,0,RectWidth,RectHeight,SourceDC, LeftPos,TopPos,SRCCOPY); Bitmap:=TBitmap.Create; Bitmap.Handle:=BHandle; Stream := TMemoryStream.Create; Bitmap.SaveToStream(Stream); Stream.Free; try  MyJpeg.Assign(Bitmap);  MyJpeg.CompressionQuality:=70;  MyJpeg.Compress;  MyJpeg.SaveToFile('C:MyJPEGImage.JPG'); finally  MyJpeg.Free;  Bitmap.Free;  DeleteDC(DestDC);  ReleaseDC(Bhandle,SourceDC); end;end;