Delphi控件继承类

发布网友发布时间：2022-05-02 22:10

共2个回答

热心网友时间：2022-06-27 18:46

主要调用Tbitmap,TCanvas就可以了代码如下procere TForm1.snapscreen(a,b,c,d:Integer);
var
bmpscreen:Tbitmap;
jpegscreen:Tjpegimage;
FullscreenCanvas:TCanvas;
dc:HDC;
sourceRect, destRect: TRect;
begin
try
dc:=getdc(0);
fullscreencanvas:=Tcanvas.Create;
fullscreencanvas.Handle:=dc;
bmpscreen:=Tbitmap.create;
bmpscreen.Width :=c-a;
bmpscreen.Height :=d-b;
sourcerect:=rect(0,0,c-a ,d-b );
destrect:= rect(a,b,c,d);
bmpscreen.Canvas.CopyRect(sourcerect,fullscreenCanvas,destrect);
jpegscreen:=Tjpegimage.Create ;
jpegscreen.Assign (bmpscreen);
jpegscreen.CompressionQuality:=100;
jpegscreen.SaveToFile(ExtractFilePath(ParamStr(0))+'tmp.jpg');
FullscreenCanvas.Free;
bmpscreen.Free;
jpegscreen.Free ;
ReleaseDC(0, DC);
except
end;
end;

热心网友时间：2022-06-27 18:47

从TObject继承.