在Delphi中﹐有什么簡單的方法使圖片平鋪在窗口中﹐作為底紋?

Question

窗体上放一个Image控件,
Align属性设为alClient,
stretch属性设为true
Picture属性设为你想要的图片就可以了

Answer 1

  private
    FClientInstance,FPrevClientProc : TFarProc;
    procedure ClientWndProc(var Message: TMessage);
    { Private declarations }
  public
    { Public declarations }............
.....
procedure TForm1.FormCreate(Sender: TObject);
begin
  Width:=800;
  Height:=600;
  Top:=0;
  Left:=0;
//  if FileExists(G_ImagesPath+'image'+IntToStr(G_WallPaper)+'.bmp') then
//    ImageWallPaper.Picture.LoadFromFile(G_ImagesPath+'image'+IntToStr(G_WallPaper)+'.bmp');
  FClientInstance := MakeObjectInstance(ClientWndProc);
  FPrevClientProc := Pointer(GetWindowLong(ClientHandle, GWL_WNDPROC));
  SetWindowLong(ClientHandle, GWL_WNDPROC, LongInt(FClientInstance));
end;procedure TForm1.ClientWndProc(var Message: TMessage);
var
  MyDC : hDC;
  Ro, Co : Word;
begin
  with Message do
  case Msg of
  WM_ERASEBKGND:
  begin
    MyDC := TWMEraseBkGnd(Message).DC;
    for Ro := 0 to ClientHeight div Image1.Picture.Height do
      for Co := 0 to ClientWIDTH div Image1.Picture.Width do
        BitBlt(MyDC, Co*Image1.Picture.Width, Ro*Image1.Picture.Height,
        Image1.Picture.Width, Image1.Picture.Height,
        Image1.Picture.Bitmap.Canvas.Handle, 0, 0, SRCCOPY);
        Result := 1;
      end;
      else
        Result := CallWindowProc(FPrevClientProc, ClientHandle, Msg, wParam, lParam);
  end;
end;