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;
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;