如何获取系统当前的分辨率

Question

如何获取系统当前的分辨率

Answer 1

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;

Answer 2

GetSystemMetrics(SM_CXSCREEN);  分辩率宽
GetSystemMetrics(SM_CXSCREEN);  分辩率高

Answer 3

var
Screen: TScreen;
begin
  showmessage('分辨率为：'+inttostr(Screen.Width)+'×'+inttostr(Screen.Height))
end;

Answer 4

GetSystemMetrics(SM_CXSCREEN);  分辩率宽
GetSystemMetrics(SM_CYSCREEN);  分辩率高
楼上的认真点了！！！！

Answer 5

最简单还是用Screen。
delphi中本来就提供了一个默认Screen: TScreen，不用声明。
如可以在formcreate中写： 
 showmessage(Format('x:%d,y:%d',[Screen.Width,Screen.Height]));

Answer 6

//Return values for ChangeDisplaySettings
// DISP_CHANGE_SUCCESSFUL          = 0;
//  DISP_CHANGE_RESTART             = 1;
//  DISP_CHANGE_FAILED              = -1;
//  DISP_CHANGE_BADMODE             = -2;
//  DISP_CHANGE_NOTUPDATED          = -3;
//  DISP_CHANGE_BADFLAGS            = -4;
//  DISP_CHANGE_BADPARAM            = -5;//改变刷新率
function ChangeDisplayFrequency(dwFrequency:DWORD): LongInt;
var
  DeviceMode: TDeviceMode;
begin
  EnumDisplaySettings(nil,Cardinal(-1), DeviceMode);
  DeviceMode.dmDisplayFrequency := dwFrequency;
  Result := ChangeDisplaySettings(DeviceMode,CDS_UPDATEREGISTRY);
end;//得到刷新率
function GetDisplayFrequency: DWORD;
var
 DeviceMode: TDeviceMode;
begin
  EnumDisplaySettings(nil, Cardinal(-1), DeviceMode);
  Result := DeviceMode.dmDisplayFrequency;
end;//改变系统分辨率
function Resolution(X,Y:DWORD):LongInt;
var
DevMode:TDeviceMode;
begin
  if EnumDisplaySettings(nil,0,DevMode) then
   begin
    DevMode.dmFields:=DM_PELSWIDTH Or DM_PELSHEIGHT;
    DevMode.dmPelsWidth:=X;
    DevMode.dmPelsHeight:=Y;
    Result:=ChangeDisplaySettings(DevMode,0);
  end
  else //非法的失败
    Result := -1;
end;