如何控制分辩率（在线）

Question

如何控制分辩率的大小。如当前为1024*768 改为800*600？？

Answer 1

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;

Answer 2

function ChangeDisplay(WResolution, HResolution, Depth: DWORD) : Boolean;
var
  i: Integer;
  DevMode: TDevMode;
begin
  Result := False;
  i:=0;
  while EnumDisplaySettings(nil,i,DevMode) do begin
    with DevMode do begin
      if (dmPelsWidth = WResolution) and
         (dmPelsHeight = HResolution) and
         (dmBitsPerPel = Depth) then
        if ChangeDisplaySettings(DevMode,CDS_UPDATEREGISTRY) =
          DISP_CHANGE_SUCCESSFUL then begin
          Result := True;
          Break;
        end;
      Inc(i);
    end;
  end;
end;