动态修改显示器分辨率

Windows提供给我们两个API函数，可以动态调整显示器的分辨率，他们是EnumDisplaySettings() 和ChangeDisplaySettings()，下面这个例子就是了

function DynamicResolution(X, Y: word): BOOL;
var
lpDevMode: TDeviceMode;
begin
Result := EnumDisplaySettings(nil, 0, lpDevMode);
if Result then
begin
lpDevMode.dmFields := DM_PELSWIDTH Or DM_PELSHEIGHT;
lpDevMode.dmPelsWidth := X;
lpDevMode.dmPelsHeight := Y;
Result := ChangeDisplaySettings(lpDevMode, 0) = DISP_CHANGE_SUCCESSFUL;
end
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
if DynamicResolution(640, 480) then
ShowMessage('Now is 640*480');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
if DynamicResolution(800, 600) then
ShowMessage('Now is 800*600');
end;