mfc串口通信收发数据代码

以下是一个简单的 MFC 串口通信收发数据的示例代码：

// 在头文件中定义一个 CSerialPort 类，该类用于串口通信
class CSerialPort
{
public:
    CSerialPort();
    ~CSerialPort();

    bool OpenPort(int portNumber, DWORD baudRate);
    void ClosePort();
    bool IsOpen();
    bool WriteData(const char* data, DWORD dataSize);
    bool ReadData(char* buffer, DWORD bufferSize);

private:
    HANDLE m_hComm;
};

// 在源文件中实现 CSerialPort 类的成员函数

CSerialPort::CSerialPort()
{
    m_hComm = NULL;
}

CSerialPort::~CSerialPort()
{
    ClosePort();
}

bool CSerialPort::OpenPort(int portNumber, DWORD baudRate)
{
    CString portName;
    portName.Format(_T("COM%d"), portNumber);

    m_hComm = CreateFile(portName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (m_hComm == INVALID_HANDLE_VALUE)
    {
        return false;
    }

    DCB dcb;
    memset(&dcb, 0, sizeof(DCB));
    dcb.DCBlength = sizeof(DCB);

    if (!GetCommState(m_hComm, &dcb))
    {
        CloseHandle(m_hComm);
        return false;
    }

    dcb.BaudRate = baudRate;
    dcb.ByteSize = 8;
    dcb.Parity = NOPARITY;
    dcb.StopBits = ONESTOPBIT;

    if (!SetCommState(m_hComm, &dcb))
    {
        CloseHandle(m_hComm);
        return false;
    }

    COMMTIMEOUTS timeouts;
    timeouts.ReadIntervalTimeout = MAXDWORD;
    timeouts.ReadTotalTimeoutMultiplier = 0;
    timeouts.ReadTotalTimeoutConstant = 0;
    timeouts.WriteTotalTimeoutMultiplier = 0;
    timeouts.WriteTotalTimeoutConstant = 0;

    if (!SetCommTimeouts(m_hComm, &timeouts))
    {
        CloseHandle(m_hComm);
        return false;
    }

    return true;
}

void CSerialPort::ClosePort()
{
    if (m_hComm != NULL && m_hComm != INVALID_HANDLE_VALUE)
    {
        CloseHandle(m_hComm);
        m_hComm = NULL;
    }
}

bool CSerialPort::IsOpen()
{
    return (m_hComm != NULL && m_hComm != INVALID_HANDLE_VALUE);
}

bool CSerialPort::WriteData(const char* data, DWORD dataSize)
{
    DWORD bytesWritten;

    if (!WriteFile(m_hComm, data, dataSize, &bytesWritten, NULL))
    {
        return false;
    }

    return (bytesWritten == dataSize);
}

bool CSerialPort::ReadData(char* buffer, DWORD bufferSize)
{
    DWORD bytesRead;

    if (!ReadFile(m_hComm, buffer, bufferSize, &bytesRead, NULL))
    {
        return false;
    }

    return (bytesRead > 0);
}

使用示例：

CSerialPort serialPort;

// 打开串口 COM1，波特率为 9600
if (serialPort.OpenPort(1, 9600))
{
    // 发送数据
    const char* sendData = "Hello";
    serialPort.WriteData(sendData, strlen(sendData));

    // 接收数据
    char receiveBuffer[256];
    if (serialPort.ReadData(receiveBuffer, sizeof(receiveBuffer)))
    {
        // 处理接收到的数据
        CString receivedData(receiveBuffer);
        // ...
    }

    // 关闭串口
    serialPort.ClosePort();
}

请注意，这只是一个简单的示例代码，实际项目中可能需要根据需求进行更多的错误处理和状态检查。