unit Unit1;

interface

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, Vcl.ExtCtrls;

type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    Timer1: TTimer;

    Edit1: TEdit;

    Memo1: TMemo;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure FormClose(Sender: TObject; var Action: TCloseAction);

    procedure FormCreate(Sender: TObject);

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

const

  EDD_GET_DEVICE_INTERFACE_NAME = 1;

  ENUM_REGISTRY_SETTINGS = DWORD(-2);

procedure TForm1.Button1Click(Sender: TObject);

var

  Display: TDisplayDevice;

  DevMode: TDevMode;

begin

  Display.cb := SizeOf(TDisplayDevice);

  EnumDisplayDevices(nil, 1,Display, EDD_GET_DEVICE_INTERFACE_NAME);

  ZeroMemory(@DevMode, SizeOf(TDevMode));

  DevMode.dmSize := SizeOf(TDevMode);

  DevMode.dmBitsPerPel := 32;

  DevMode.dmFields := DM_BITSPERPEL or DM_PELSWIDTH or DM_PELSHEIGHT or DM_DISPLAYFREQUENCY or DM_DISPLAYFLAGS or DM_POSITION;

  ChangeDisplaySettingsEx(pwidechar(@Display.DeviceName[0]),DevMode, 0, CDS_UPDATEREGISTRY or CDS_NORESET, nil);

  ChangeDisplaySettingsEx(nil, PDevMode(nil)^, 0, 0, nil);

end;

procedure TForm1.Button2Click(Sender: TObject);

var

  Display: TDisplayDevice;

  DevMode: TDevMode;

begin

  Display.cb := SizeOf(TDisplayDevice);

  EnumDisplayDevices(nil, 1 ,Display, EDD_GET_DEVICE_INTERFACE_NAME);

  EnumDisplaySettings(pwidechar(@Display.DeviceName[0]),ENUM_REGISTRY_SETTINGS, DevMode);

  DevMode.dmFields := DM_BITSPERPEL or DM_PELSWIDTH or DM_PELSHEIGHT or DM_DISPLAYFREQUENCY or DM_DISPLAYFLAGS or DM_POSITION;

  ChangeDisplaySettingsEx(pwidechar(@Display.DeviceName[0]),DevMode, 0, CDS_UPDATEREGISTRY or CDS_NORESET, nil);

  ChangeDisplaySettingsEx(nil, PDevMode(nil)^, 0, 0, nil);

end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);

begin

Button2.Click;

end;

procedure TForm1.FormCreate(Sender: TObject);

var

  Display: TDisplayDevice;

  DevMode: TDevMode;

begin

//获取显卡信息

  Display.cb := SizeOf(TDisplayDevice);

  EnumDisplayDevices(nil, 1,Display, EDD_GET_DEVICE_INTERFACE_NAME);

  Memo1.Lines.Add(pwidechar(@Display.DeviceString[0]));

  Memo1.Lines.Add(pwidechar(@Display.DeviceName[0]));

  Memo1.Lines.Add(pwidechar(@Display.DeviceKey[0]));

end;

end.