VC++6.0封装串口通讯类

VC++6.0开发平台

XP,win7操作系统都能安装.

新建一个win32控制台程序

在类视图添加一个新类

类的名字为:SerialPort

双击类名,在头文件中添加 方法声明.

在SerialPort.h中添加代码:public: //设置串口号 void setPortName(const int port); //设置波特率 void setBaud( UINT baud ); //打开串口 BOOL InitPort( UINT portnr = 5, UINT baud = 9600, char parity = 'N', UINT databits = 8, UINT stopsbits = 1 ); //发送数据 int WriteToPort(  char *writeData,int WriteSize ); //读取数据 int ReceiveChar( char *readBuff, int ReadSize ); //关闭串口 void ClosePort();private: HANDLE m_hComm;   //串口句柄 COMMTIMEOUTS m_CommTimeouts;//超时时间 DCB m_dcb;//设置波特率 停止位 串口号码..... int m_port;  //串口号 UINT m_baud;  //波特率

切换到文件视图 在SerialPort.cpp中实现声明的方法:

在SerialPort.cpp中添加代码:SerialPort::SerialPort()  //构造函数中初始化{ m_hComm = NULL; m_port = 1; m_baud = 9600;}SerialPort::~SerialPort()//析构中释放{ if (m_hComm != NULL) { CloseHandle(m_hComm); m_hComm = NULL; }}void SerialPort::setPortName( const int port)//设置串口号{    m_port = port;}void SerialPort::setBaud( UINT baud )//设置波特率{ m_baud = baud;}void SerialPort::ClosePort()//关闭串口{ if (m_hComm != INVALID_HANDLE_VALUE) { CloseHandle(m_hComm); } m_hComm = INVALID_HANDLE_VALUE;}BOOL SerialPort::InitPort( UINT portnr, UINT baud, char parity, UINT databits, UINT stopsbits )//打开串口{ //assert(portnr > 0 && portnr < 50); char *szPort = new char[50]; char *szBaud = new char[50]; baud = m_baud; portnr = m_port; sprintf(szPort, 'COM%d', portnr); sprintf(szBaud, 'baud=%d parity=%c data=%d stop=%d', baud, parity, databits, stopsbits); if (m_hComm != NULL) { CloseHandle(m_hComm); m_hComm = NULL; } m_hComm = CreateFile(szPort, // communication port string (COMX) GENERIC_READ | GENERIC_WRITE, // read/write types NULL, // comm devices must be opened with exclusive access NULL, // no security attributes OPEN_EXISTING, // comm devices must use OPEN_EXISTING FILE_ATTRIBUTE_NORMAL, // Async I/O     NULL); // template must be 0 for comm devices if (m_hComm == INVALID_HANDLE_VALUE) { // port not found delete [] szPort; delete [] szBaud; return FALSE; } // set the timeout values memset(&m_CommTimeouts, 0, sizeof(m_CommTimeouts)); memset(&m_dcb, 0, sizeof(m_dcb)); m_CommTimeouts.ReadIntervalTimeout = 1000; m_CommTimeouts.ReadTotalTimeoutMultiplier = 1000; m_CommTimeouts.ReadTotalTimeoutConstant = 1000; m_CommTimeouts.WriteTotalTimeoutMultiplier = 1000; m_CommTimeouts.WriteTotalTimeoutConstant = 1000; // configure if (SetCommTimeouts(m_hComm, &m_CommTimeouts)) {    if (GetCommState(m_hComm, &m_dcb)) { if (BuildCommDCB(szBaud, &m_dcb)) { if (SetCommState(m_hComm, &m_dcb)) ; // normal operation... continue else return FALSE;//ProcessErrorMessage('SetCommState()'); } else return FALSE;//ProcessErrorMessage('BuildCommDCB()'); } else return FALSE;//ProcessErrorMessage('GetCommState()'); } else return FALSE;//ProcessErrorMessage('SetCommTimeouts()'); delete [] szPort; delete [] szBaud; // flush the port PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT); return TRUE;}int SerialPort::WriteToPort(  char *writeData, int WriteSize )//发送数据{ BOOL bResult = TRUE; DWORD BytesSent = 0; // Clear buffer PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT); bResult = WriteFile(m_hComm, writeData, WriteSize, &BytesSent, NULL); if (!bResult)   { DWORD dwError = GetLastError(); switch (dwError) { case ERROR_IO_PENDING: { // continue to GetOverlappedResults() BytesSent = 0; //bWrite = FALSE; return -1; break; } default: { // all other error codes //port->ProcessErrorMessage('WriteFile()'); //return -1; } } }  // end if(bWrite) //Verify that the data size send equals what we tried to send if (BytesSent != (DWORD)WriteSize) // Length of message to send) { //TRACE('WARNING: WriteFile() error.. Bytes Sent: %d; Message Length: %d\n', BytesSent, strlen((char*)port->m_szWriteBuffer)); return -1; } return BytesSent;}//----------------int SerialPort::ReceiveChar( char *readBuff, int ReadSize )//接收数据{ BOOL  bRead = TRUE;  BOOL  bResult = TRUE; DWORD dwError = 0; DWORD BytesRead = 0; bResult = ReadFile(m_hComm, readBuff, ReadSize, &BytesRead, NULL); if (!bResult)   {  switch (dwError = GetLastError())  {  case ERROR_IO_PENDING: {  // asynchronous i/o is still in progress  // Proceed on to GetOverlappedResults(); //bRead = FALSE; return -1; break; } default: { // Another error has occured.  Process this error. //port->ProcessErrorMessage('ReadFile()'); break; }  } } if (BytesRead != (DWORD)ReadSize) { PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR); return -1; } return BytesRead;}

第7步骤中的代码复制后没有排版,  先按ctrl+a全选   然后再按alt+F8  自动排版在stdafx.h中 引入头文件#include

以下是Demo.cpp中的代码#include 'stdafx.h'#include 'SerialPort.h'SerialPort m_serialPort = new SerialPort();int main(int argc, char* argv[]){ m_serialPort->setPortName(1); m_serialPort->setBaud(9600); m_serialPort->InitPort(); //一下是打印机的功能 char writeBuf[10]; writeBuf[0] = 0x0A; for(int i = 0; i < 5; i++)//循环发送  打印空的5行 { m_serialPort->WriteToPort(writeBuf,1); //发送打印换行 } printf('Hello World!\n'); return 0;}

这个类封装好后可以将 SerialPort.h 和SerialPort.cpp文件放带MFC中调用,也可以在Win32程序中调用.扩展功能,比如写一个热敏打印机的程序. 则添加一个HotPrinter类 继承这个类,这样管理起来比较方便.比如我自己的热敏打印机这样写的,我就不写具体步骤了.