[C++知识库]实时检测串口连接状态

废话不多说，在此记录一个实时检测串口链接状态的操作。

struct SerialPortInfo
{
	std::string portName;
	std::string description;
};

std::string wstringToString(const std::wstring& wstr)
{

	if (wstr.empty())
	{
		return std::string();
	}

	int size = WideCharToMultiByte(CP_ACP, 0, &wstr[0], (int)wstr.size(), NULL, 0, NULL, NULL);
	std::string ret = std::string(size, 0);
	WideCharToMultiByte(CP_ACP, 0, &wstr[0], (int)wstr.size(), &ret[0], size, NULL, NULL); // CP_UTF8

	return ret;
}

bool enumDetailsSerialPorts(vector<SerialPortInfo>& portInfoList)
{
	bool bRet = false;
	std::string strPortName;
	HANDLE m_handle;
	TCHAR portName[2048] = { 0 };
	SerialPortInfo m_serialPortInfo;

	for (int i = 1; i <= 255; i++)
	{
		bRet = false;

		_sntprintf(portName, sizeof(portName), _T("COM%d"), i);

		m_handle = CreateFile(portName, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);

		if (m_handle == INVALID_HANDLE_VALUE)
		{
			if (ERROR_ACCESS_DENIED == GetLastError())
			{
				bRet = true;
			}
		}
		else
		{
			bRet = true;
		}

		if (bRet)
		{
#ifdef UNICODE
			strPortName = wstringToString(portName);
#else
			strPortName = std::string(portName);
#endif
			m_serialPortInfo.portName = strPortName;
			portInfoList.push_back(m_serialPortInfo);
		}

		CloseHandle(m_handle);
	}

	return bRet;
}


int main() {	
	vector<SerialPortInfo> spInfo;
	enumDetailsSerialPorts(spInfo);
	for (int i = 0; i < spInfo.size(); i++)
	{
		std::cout << i << " - " << spInfo[i].portName << " " << spInfo[i].description << std::endl;
	}
	return 0;
	
}

上面是核心函数，剩下的仅需要写一个线程去实时调用该函数即可，或者在qt中设置一个定时器，做一个实时扫描工作。