usbdiskid.pas

该软件是在DELPHI2007环境下开发的,是获取U盘的序列号的例子程序,已经使用过,非常好.

unit USBDiskID;

interface

uses
  Windows,SysUtils,Classes,Registry;
const
  DIGCF_PRESENT = $00000002;
  DIGCF_DEVICEINTERFACE = $00000010;
  ANYSIZE_ARRAY = 1;
  SetupAPI = 'SetupAPI.DLL';

type
  HDEVINFO = Pointer;
  ULONG_PTR = DWORD;

  PSPDevInfoData = ^TSPDevInfoData;
  SP_DEVINFO_DATA = packed record
    cbSize: DWORD;
    ClassGuid: TGUID;
    DevInst: DWORD;
    Reserved: ULONG_PTR;
  end;
{$EXTERNALSYM SP_DEVINFO_DATA}
  TSPDevInfoData = SP_DEVINFO_DATA;

  PSPDeviceInterfaceData = ^TSPDeviceInterfaceData;
  SP_DEVICE_INTERFACE_DATA = packed record
    cbSize: DWORD;
    InterfaceClassGuid: TGUID;
    Flags: DWORD;
    Reserved: ULONG_PTR;
  end;
{$EXTERNALSYM SP_DEVICE_INTERFACE_DATA}
  TSPDeviceInterfaceData = SP_DEVICE_INTERFACE_DATA;

  PSPDeviceInterfaceDetailDataA = ^TSPDeviceInterfaceDetailDataA;
  SP_DEVICE_INTERFACE_DETAIL_DATA_A = packed record
    cbSize: DWORD;
    DevicePath: array[0..ANYSIZE_ARRAY - 1] of AnsiChar;
  end;
{$EXTERNALSYM SP_DEVICE_INTERFACE_DETAIL_DATA_A}
  TSPDeviceInterfaceDetailDataA = SP_DEVICE_INTERFACE_DETAIL_DATA_A;
  
  function SetupDiGetClassDevsA(ClassGuid: PGUID; const Enumerator: PAnsiChar;
  hwndParent: HWND; Flags: DWORD): HDEVINFO; stdcall; external SetupAPI;

function SetupDiEnumDeviceInterfaces(DeviceInfoSet: HDEVINFO;
  DeviceInfoData: PSPDevInfoData; const InterfaceClassGuid: TGUID;
  MemberIndex: DWORD; var DeviceInterfaceData: TSPDeviceInterfaceData): BOOL; stdcall; external SetupAPI;
{$EXTERNALSYM SetupDiEnumDeviceInterfaces}

function SetupDiGetDeviceInterfaceDetailA(DeviceInfoSet: HDEVINFO;
  DeviceInterfaceData: PSPDeviceInterfaceData;
  DeviceInterfaceDetailData: PSPDeviceInterfaceDetailDataA;
  DeviceInterfaceDetailDataSize: DWORD; var RequiredSize: DWORD;
  Device: PSPDevInfoData): BOOL; stdcall; external SetupAPI;

function SetupDiDestroyDeviceInfoList(DeviceInfoSet: HDEVINFO): BOOL; stdcall; external SetupAPI;
function GetUSBDiskID(const DiskID: string; var PID: string): Boolean;
implementation

function GetUSBDiskID(const DiskID: string; var PID: string): Boolean;
var
  USBGuid: TGUID;
  USBHandle: HDEVINFO;
  Success: LongBool;
  Devn: Integer;
  DevData: TSPDevInfoData;
  DeviceInterfaceData: TSPDeviceInterfaceData;
  FunctionClassDeviceData: PSPDeviceInterfaceDetailDataA;
  BytesReturned: DWORD;
  Reg: TRegistry;
  RegData: array of Char;
  i, RegSize: Integer;
  Str, USBPath: string;
begin
  Result := false;
  Pid := '';
  Reg := TRegistry.Create;
  try
    Reg.RootKey := HKEY_LOCAL_MACHINE;
    Reg.OpenKey('SYSTEM\MountedDevices', false);
    RegSize := Reg.GetDataSize(Format('\DosDevices\%s', [DiskID]));
    SetLength(RegData, RegSize + 1);
    Reg.ReadBinaryData(Format('\DosDevices\%s', [DiskID]), RegData[0], RegSize + 1);
    for i := 0 to RegSize - 1 do
      if RegData[i] <> #0 then Str := Str + RegData[i];
    Str := Copy(Str, Pos('#RemovableMedia#', Str) + 16, Length(Str));
    Str := Copy(Str, 1, Pos('RM', Str) - 2);
    Str := UpperCase(Str);
    Reg.CloseKey;

    USBGuid := StringToGUID('{53f56307-b6bf-11d0-94f2-00a0c91efb8b}');
    USBHandle := SetupDiGetClassDevsA(@USBGuid, nil, 0, DIGCF_PRESENT or
      DIGCF_DEVICEINTERFACE);
    if USBHandle = Pointer(INVALID_HANDLE_VALUE) then Exit;
    Devn := 0;
    repeat
      DeviceInterfaceData.cbSize := SizeOf(TSPDeviceInterfaceData);
      Success := SetupDiEnumDeviceInterfaces(USBHandle, nil, USBGuid, Devn,
        DeviceInterfaceData);
      if Success then
      begin
        DevData.cbSize := SizeOf(DevData);
        BytesReturned := 0;
        SetupDiGetDeviceInterfaceDetailA(USBHandle, @DeviceInterfaceData, nil,
          0, BytesReturned, @DevData);
        if (BytesReturned <> 0) and (GetLastError = ERROR_INSUFFICIENT_BUFFER) then
        begin
          FunctionClassDeviceData := AllocMem(BytesReturned);
          FunctionClassDeviceData^.cbSize := SizeOf(TSPDeviceInterfaceDetailDataA);
          if SetupDiGetDeviceInterfaceDetailA(USBHandle, @DeviceInterfaceData,
            FunctionClassDeviceData, BytesReturned, BytesReturned, @DevData) then
          begin
            USBPath := StrPas(PChar(@FunctionClassDeviceData.DevicePath));
            if Reg.OpenKeyReadOnly(Format('SYSTEM\CurrentControlSet\Enum%s',
              [StringReplace(Copy(USBPath, 4, Pos('{', USBPath) - 5),
                '#', '\', [rfReplaceAll])])) then
              if UpperCase(Reg.ReadString('ParentIdPrefix')) = Str then
              begin
                Delete(USBPath, 1, Pos('#', USBPath));
                PID := Copy(USBPath, Pos('#', USBPath) + 1, Length(USBPath));
                PID := Copy(PID, 1, Pos('#{', PID) - 1);
                PID := UpperCase(StringReplace(PID, '&', '', [rfReplaceAll]));
                Result := True;
                Break;
              end;
            Reg.CloseKey;
            Inc(Devn);
          end;
          FreeMem(FunctionClassDeviceData);
        end;
      end;
    until not Success;
    SetupDiDestroyDeviceInfoList(USBHandle);
  finally
    Reg.Free;
  end;
end;

end.