使用CreateFile API 枚举串口

void EnumSerialPort()
{
  for(INT iPort=1; iPort<32; iPort++)
  {
    TCHAR szPortName[64];
    _stprintf_s(szPortName, _T("\\\\.\\COM%d"), iPort);
    
    HANDLE hComPort = CreateFile(szPortName,
      GENERIC_READ | GENERIC_WRITE,
      0,
      NULL,
      OPEN_EXISTING,
      0,
      NULL);
    BOOL bDone = FALSE;
    if(hComPort != INVALID_HANDLE_VALUE)
    {
      CloseHandle(hComPort);
      bDone = 1;
    }
    else if(GetLastError() != ERROR_FILE_NOT_FOUND)
    {
      bDone = 2;
    }
    
    if(bDone)
    {
      TRACE(_T("COM%d%s\n"), iPort, 
        bDone==2? _T("(In using)"):_T(""));
    }
  }
}

//调试输出

COM1
COM7
COM8(In using)