unit1.~pas

simple system devices enumeration

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Panel1: TPanel;
    rgDeviceType: TRadioGroup;
    Button2: TButton;
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

Uses SetupApi;

procedure TForm1.Button2Click(Sender: TObject);
var
  Guid : TGUID;
  PnPHandle: HDevInfo;
  DeviceInfoData : SP_DEVINFO_DATA;
  DeviceInterfaceData: SP_DEVICE_INTERFACE_DATA;
  i : Cardinal;
  Success: LongBool;
  DataT, buffersize: Cardinal;
  buffer : PByte;
Const
  DisplayGuid : TGUID = '{4d36e968-e325-11ce-bfc1-08002be10318}';
  HidGuid     : TGUID = '{745a17a0-74d3-11d0-b6fe-00a0c90f57da}';
  USBGuid     : TGUID = '{36FC9E60-C465-11CF-8056-444553540000}';
begin
 ListBox1.Clear;

 If rgDeviceType.ItemIndex = 0 then begin  // 埋