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)