シリアルポートをフレンドリ名で列挙

Enumerate serial ports with friendly name

{ Setup APIs }
type
  { HDEVINFO }
  HDEVINFO = THandle;
  {$EXTERNALSYM HDEVINFO}

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

const
  { Flags for SetupDiGetClassDevs }
  DIGCF_DEFAULT         = $00000001;
  {$EXTERNALSYM DIGCF_DEFAULT}
  DIGCF_PRESENT         = $00000002;
  {$EXTERNALSYM DIGCF_PRESENT}
  DIGCF_ALLCLASSES      = $00000004;
  {$EXTERNALSYM DIGCF_ALLCLASSES}
  DIGCF_PROFILE         = $00000008;
  {$EXTERNALSYM DIGCF_PROFILE}
  DIGCF_DEVICEINTERFACE = $00000010;
  {$EXTERNALSYM DIGCF_DEVICEINTERFACE}

  { Property for SetupDiGetDeviceRegistryProperty }
  SPDRP_DEVICEDESC      = $00000000;
  {$EXTERNALSYM SPDRP_DEVICEDESC}
  SPDRP_FRIENDLYNAME    = $0000000C;
  {$EXTERNALSYM SPDRP_FRIENDLYNAME}

  { Scope for SetupDiOpenDevRegKey }
  DICS_FLAG_GLOBAL      = $00000001;
  {$EXTERNALSYM DICS_FLAG_GLOBAL}

  { KeyType for SetupDiOpenDevRegKey }
  DIREG_DEV             = $00000001;
  {$EXTERNALSYM DIREG_DEV}

{ SetupDiClassGuidsFromName }
function SetupDiClassGuidsFromName(const ClassName: PChar;
                                   ClassGuidList: PGUID;
                                   ClassGuidListSize: DWORD;
                                   var RequiredSize: DWORD): BOOL; stdcall;
  external 'SetupApi.dll' name
{$IFDEF UNICODE}
  'SetupDiClassGuidsFromNameW';
{$ELSE}
  'SetupDiClassGuidsFromNameA';
{$ENDIF}
{$EXTERNALSYM SetupDiClassGuidsFromName}

{ SetupDiGetClassDevs }
function SetupDiGetClassDevs(ClassGuid: PGUID;
                             const Enumerator: PChar;
                             hwndParent: HWND;
                             Flags: DWORD): HDEVINFO; stdcall;
  external 'SetupApi.dll' name
{$IFDEF UNICODE}
  'SetupDiGetClassDevsW';
{$ELSE}
  'SetupDiGetClassDevsA';
{$ENDIF}
{$EXTERNALSYM SetupDiGetClassDevs}

{ SetupDiDestroyDeviceInfoList }
function SetupDiDestroyDeviceInfoList(DeviceInfoSet: HDEVINFO): BOOL; stdcall;
  external 'SetupApi.dll' name 'SetupDiDestroyDeviceInfoList';
{$EXTERNALSYM SetupDiDestroyDeviceInfoList}

{ SetupDiEnumDeviceInfo }
function SetupDiEnumDeviceInfo(DeviceInfoSet: HDEVINFO;
                               MemberIndex: DWORD;
                               var DeviceInfoData: SP_DEVINFO_DATA): BOOL; stdcall;
  external 'SetupApi.dll' name 'SetupDiEnumDeviceInfo';
{$EXTERNALSYM SetupDiEnumDeviceInfo}

{ SetupDiGetDeviceRegistryProperty }
function SetupDiGetDeviceRegistryProperty(DeviceInfoSet: HDEVINFO;
                                          const DeviceInfoData: SP_DEVINFO_DATA;
                                          Prop: DWORD;
                                          PropertyRegDataType: PDWORD;
                                          PropertyBuffer: Pointer;
                                          PropertyBufferSize: DWORD;
                                          var RequiredSize: DWORD): BOOL; stdcall;
  external 'SetupApi.dll' name
{$IFDEF UNICODE}
  'SetupDiGetDeviceRegistryPropertyW';
{$ELSE}
  'SetupDiGetDeviceRegistryPropertyA';
{$ENDIF}
{$EXTERNALSYM SetupDiGetDeviceRegistryProperty}

{ SetupDiOpenDevRegKey }
function SetupDiOpenDevRegKey(DeviceInfoSet: HDEVINFO;
                              var DeviceInfoData: SP_DEVINFO_DATA;
                              Scope: DWORD;
                              HwProfile: DWORD;
                              KeyType: DWORD;
                              samDesired: REGSAM): HKEY; stdcall;
  external 'SetupApi.dll' name 'SetupDiOpenDevRegKey';
{$EXTERNALSYM SetupDiOpenDevRegKey}

function EnumSerialCommWithFriendlyName(const S: TStrings): Integer;
var
  Guid: TGUID;
  Size: DWORD;
  hDevInf: HDEVINFO;
  Index: DWORD;
  DevInfoData: SP_DEVINFO_DATA;
  S1: String;
  hRegKey: HKEY;
  S2: String;
  RegType: DWORD;
  PortNo: Integer;
begin

  Result := 0;

  Size := 0;
  if SetupDiClassGuidsFromName('Ports',@Guid,1,Size) = False then
  begin
    RaiseLastOSError;
  end;

  hDevInf := SetupDiGetClassDevs(@Guid,nil,0,DIGCF_PRESENT);
  if hDevInf = INVALID_HANDLE_VALUE then
  begin
    RaiseLastOSError;
  end;

  try
    Index := 0;
    while True do
    begin
      FillChar(DevInfoData,SizeOf(DevInfoData),0);
      DevInfoData.cbSize := SizeOf(DevInfoData);
      if SetupDiEnumDeviceInfo(hDevInf,Index,DevInfoData) = False then
      begin
        Break;
      end;

      SetupDiGetDeviceRegistryProperty(hDevInf,DevInfoData,SPDRP_FRIENDLYNAME,
                                       nil,nil,0,Size);
      SetLength(S1,(Size + SizeOf(Char)) div SizeOf(Char));

      if SetupDiGetDeviceRegistryProperty(hDevInf,DevInfoData,SPDRP_FRIENDLYNAME,
                                          nil,PChar(S1),Size,Size) = True then
      begin
        SetLength(S1,StrLen(PChar(S1)));
        hRegKey := SetupDiOpenDevRegKey(hDevInf,DevInfoData,DICS_FLAG_GLOBAL,0,DIREG_DEV,KEY_READ);
        if hRegKey <> INVALID_HANDLE_VALUE then
        begin
          try
            if RegQueryInfoKey(hRegKey,nil,nil,nil,nil,nil,nil,nil,nil,
                               @Size,nil,nil) = ERROR_SUCCESS then
            begin
              SetLength(S2,(Size + SizeOf(Char)) div SizeOf(Char));
              if (RegQueryValueEx(hRegKey,'PortName',nil,@RegType,Pointer(PChar(S2)),
                                  @Size) = ERROR_SUCCESS) and
                 (RegType = REG_SZ) then
              begin
                SetLength(S2,StrLen(PChar(S2)));
                if CompareText(Copy(S2,1,3),'COM') = 0 then
                begin
                  if TryStrToInt(Copy(S2,4,Length(S2)),PortNo) = True then
                  begin
                    S.AddObject(S1,Pointer(PortNo));
                    if Result < PortNo then
                    begin
                      Result := PortNo;
                    end;
                  end;
                end;
              end;
            end;

          finally
            RegCloseKey(hRegKey);
          end;
        end;
      end;

      Index := Index + 1;
    end;

  finally
    SetupDiDestroyDeviceInfoList(hDevInf);
  end;

end;