cserialport类源代码

cserialport类是用于在计算机与串行端口之间进行数据通信的一个类。以下是该类的源代码：

class CSerialPort {
public:
    CSerialPort();
    ~CSerialPort();

    BOOL OpenPort(int portNum, int baudRate);
    void ClosePort();

    BOOL WriteData(const unsigned char* pData, int dataSize);
    BOOL ReadData(unsigned char* pData, int bufferSize, int& bytesRead);

private:
    HANDLE m_hSerialPort;
    BOOL m_isOpen;
};

CSerialPort::CSerialPort()
{
    m_hSerialPort = NULL;
    m_isOpen = FALSE;
}

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

BOOL CSerialPort::OpenPort(int portNum, int baudRate)
{
    if (m_isOpen)
        return FALSE;

    char portName[10];
    sprintf(portName, "COM%d", portNum);

    m_hSerialPort = CreateFile(portName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (m_hSerialPort == INVALID_HANDLE_VALUE)
        return FALSE;

    DCB dcb;
    memset(&dcb, 0, sizeof(DCB));

    dcb.DCBlength = sizeof(DCB);
    dcb.BaudRate = baudRate;
    dcb.ByteSize = 8;
    dcb.Parity = NOPARITY;
    dcb.StopBits = ONESTOPBIT;

    if (!SetCommState(m_hSerialPort, &dcb))
        return FALSE;

    m_isOpen = TRUE;

    return TRUE;
}

void CSerialPort::ClosePort()
{
    if (m_isOpen)
    {
        CloseHandle(m_hSerialPort);
        m_isOpen = FALSE;
    }
}

BOOL CSerialPort::WriteData(const unsigned char* pData, int dataSize)
{
    if (!m_isOpen)
        return FALSE;

    DWORD bytesWritten;
    if (!WriteFile(m_hSerialPort, pData, dataSize, &bytesWritten, NULL))
        return FALSE;

    return TRUE;
}

BOOL CSerialPort::ReadData(unsigned char* pData, int bufferSize, int& bytesRead)
{
    if (!m_isOpen)
        return FALSE;

    DWORD bytesToRead;
    if (!PeekNamedPipe(m_hSerialPort, NULL, 0, NULL, &bytesToRead, NULL))
        return FALSE;

    if (bytesToRead > 0)
    {
        if (!ReadFile(m_hSerialPort, pData, bufferSize, (LPDWORD)&bytesRead, NULL))
            return FALSE;

        return TRUE;
    }

    bytesRead = 0;
    return TRUE;
}

以上是CSerialPort类的源代码。此类提供了打开和关闭串行端口的功能，并可以通过WriteData和ReadData函数分别写入和读取数据。OpenPort函数用于打开指定端口号和波特率的串行端口。ClosePort函数用于关闭串行端口。WriteData函数用于向串行端口写入数据，并返回是否写入成功。ReadData函数用于从串行端口读取数据，并返回是否读取成功，并将读取的字节数存储在bytesRead参数中。