如需转载请标明出处：http://blog.csdn.net/itas109

这是一份优秀的类文件，好多的地方值得我们学习，具体在多线程，事件，自定义消息，类的封装方面等等。
Remon提供的串口类网址为： http://codeguru.earthweb.com/network/serialport.shtml，

其他贡献者：http://blog.csdn.net/liquanhai/article/details/6941574

代码下载：http://download.csdn.net/detail/itas109/6855323

代码托管：https://code.csdn.net/itas109/cserialport

源代码如下：

CSerialPort.h

/*
**  FILENAME            CSerialPort.h
**
**  PURPOSE             This class can read, write and watch one serial port.
**                      It sends messages to its owner when something happends on the port
**                      The class creates a thread for reading and writing so the main
**                      program is not blocked.
**
**  CREATION DATE       15-09-1997
**  LAST MODIFICATION   12-11-1997
**
**  AUTHOR              Remon Spekreijse
**
**
************************************************************************************
**  author: mrlong date:2007-12-25
**
**  改进
**    1) 增加ClosePort
**    2) 增加 writetoProt() 两个方法
**    3) 增加 SendData 与 RecvData 方法
**
************************************************************************************
**  author：liquanhai date:2011-11-04
**  改进
**    1）增加 ClosePort中交出控制权，防止死锁问题
**    2) 增加 ReceiveChar中防止线程死锁
***************************************************************************************
**  author: itas109  date:2014-01-10
**  Blog：blog.csdn.net/itas109
**
**  改进
**    1) 解决COM10以上端口无法显示的问题
**    2) 扩展可选择端口，最大值MaxSerialPortNum可以自定义
**    3) 添加QueryKey()和Hkey2ComboBox两个方法，用于自动查询当前有效的串口号。
**
*/#ifndef __SERIALPORT_H__
#define __SERIALPORT_H__#define WM_COMM_BREAK_DETECTED      WM_USER+1  // A break was detected on input.
#define WM_COMM_CTS_DETECTED        WM_USER+2  // The CTS (clear-to-send) signal changed state.
#define WM_COMM_DSR_DETECTED        WM_USER+3  // The DSR (data-set-ready) signal changed state.
#define WM_COMM_ERR_DETECTED        WM_USER+4  // A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY.
#define WM_COMM_RING_DETECTED       WM_USER+5  // A ring indicator was detected.
#define WM_COMM_RLSD_DETECTED       WM_USER+6  // The RLSD (receive-line-signal-detect) signal changed state.
#define WM_COMM_RXCHAR              WM_USER+7  // A character was received and placed in the input buffer.
#define WM_COMM_RXFLAG_DETECTED     WM_USER+8  // The event character was received and placed in the input buffer.
#define WM_COMM_TXEMPTY_DETECTED    WM_USER+9  // The last character in the output buffer was sent.  #define MaxSerialPortNum 20   ///有效的串口总个数，不是串口的号 //add by itas109 2014-01-09
class CSerialPort
{
public:// contruction and destructionCSerialPort();virtual      ~CSerialPort();// port initialisation///串口初始化BOOL       InitPort(CWnd* pPortOwner, //串口句柄UINT portnr = 1, //端口号UINT baud = 19200, //波特率char parity = 'N', //奇偶校验UINT databits = 8, //数据位UINT stopbits = 1, //停止位DWORD dwCommEvents = EV_RXCHAR, //消息类型UINT writebuffersize = 1024//写缓存);// start/stop comm watching///控制串口监视线程BOOL      StartMonitoring();//开始监听BOOL        RestartMonitoring();//重新监听BOOL      StopMonitoring();//停止监听DWORD        GetWriteBufferSize();///获取写缓冲大小DWORD        GetCommEvents();///获取事件DCB          GetDCB();///获取DCBCOMMTIMEOUTS GetCommTimeOuts();//BOOL         SetCommTimeOuts(COMMTIMEOUTS * lpTimeOuts);///写数据到串口void        WriteToPort(char* string);void      WriteToPort(char* string,int n);//add by mrlong 2007-12-25void      WriteToPort(LPCTSTR string);//add by mrlong 2007-12-25void      WriteToPort(LPCTSTR string,int n);//add by mrlong 2007-12-2void        WriteToPort(BYTE* Buffer, int n);// add by mrlongvoid        ClosePort();//关闭串口 // add by mrlong 2007-12-25BOOL        RecvData(LPTSTR lpszData, const int nSize);//串口发送函数 by mrlong 2008-2-15void        SendData(LPCTSTR lpszData, const int nLength);//串口接收函数 by mrlong 2008-2-15void QueryKey(HKEY hKey);///查询注册表的串口号，将值存于数组中void Hkey2ComboBox(CComboBox& m_PortNO);///将QueryKey查询到的串口号添加到CComboBox控件中protected:// protected memberfunctionsvoid     ProcessErrorMessage(char* ErrorText);///错误处理static UINT CommThread(LPVOID pParam);///线程函数static void    ReceiveChar(CSerialPort* port, COMSTAT comstat);///接收字符static void  WriteChar(CSerialPort* port);///写字符// threadCWinThread*         m_Thread;///thread监视线程BOOL                m_bIsSuspened;///thread监视线程是否挂起// synchronisation objectsCRITICAL_SECTION m_csCommunicationSync;///临界资源BOOL               m_bThreadAlive;///监视线程运行标志// handlesHANDLE              m_hWriteEvent;HANDLE                m_hComm;///串口句柄HANDLE               m_hShutdownEvent;// Event array. // One element is used for each event. There are two event handles for each port.// A Write event and a receive character event which is located in the overlapped structure (m_ov.hEvent).// There is a general shutdown when the port is closed.///事件数组，包括一个写事件，接收事件，关闭事件///一个元素用于一个事件。有两个事件线程处理端口。///写事件和接收字符事件位于overlapped结构体（m_ov.hEvent）中///当端口关闭时，有一个通用的关闭。HANDLE             m_hEventArray[3];// structuresOVERLAPPED            m_ov;///异步I/OCOMMTIMEOUTS       m_CommTimeouts;///超时设置DCB                   m_dcb;///设备控制块// owner windowCWnd*              m_pOwner;// miscUINT                m_nPortNr;char*             m_szWriteBuffer;///写缓冲区DWORD                m_dwCommEvents;DWORD                m_nWriteBufferSize;///写缓冲大小int m_nWriteSize; //写入字节数 //add by mrlong 2007-12-25
};#endif __SERIALPORT_H__

CSerialPort.cpp

/*
**  FILENAME            CSerialPort.cpp
**
**  PURPOSE             This class can read, write and watch one serial port.
**                      It sends messages to its owner when something happends on the port
**                      The class creates a thread for reading and writing so the main
**                      program is not blocked.
**
**  CREATION DATE       15-09-1997
**  LAST MODIFICATION   12-11-1997
**
**  AUTHOR              Remon Spekreijse
**
**
*/#include "stdafx.h"
#include "SerialPort.h"#include <assert.h>int m_nComArray[20];
//
// Constructor
//
CSerialPort::CSerialPort()///构造函数
{m_hComm = NULL;// initialize overlapped structure members to zero///初始化异步结构体m_ov.Offset = 0;m_ov.OffsetHigh = 0;// create eventsm_ov.hEvent = NULL;m_hWriteEvent = NULL;m_hShutdownEvent = NULL;m_szWriteBuffer = NULL;m_bThreadAlive = FALSE;m_nWriteSize=1;///m_bIsSuspened = FALSE;///
}//
// Delete dynamic memory
//
CSerialPort::~CSerialPort()///析构函数
{do{SetEvent(m_hShutdownEvent);} while (m_bThreadAlive);// if the port is still opened: close it if (m_hComm != NULL){CloseHandle(m_hComm);m_hComm = NULL;}// Close Handles  if(m_hShutdownEvent!=NULL)CloseHandle( m_hShutdownEvent); if(m_ov.hEvent!=NULL)CloseHandle( m_ov.hEvent ); if(m_hWriteEvent!=NULL)CloseHandle( m_hWriteEvent ); TRACE("Thread ended\n");delete [] m_szWriteBuffer;
}//
// Initialize the port. This can be port 1 to MaxSerialPortNum.
///初始化串口。只能是1-MaxSerialPortNum
//
BOOL CSerialPort::InitPort(CWnd* pPortOwner,    // the owner (CWnd) of the port (receives message)UINT  portnr,     // portnumber (1..MaxSerialPortNum)UINT  baud,          // baudratechar  parity,        // parity UINT  databits,       // databits UINT  stopbits,     // stopbits DWORD dwCommEvents, // EV_RXCHAR, EV_CTS etcUINT  writebuffersize)  // size to the writebuffer
{assert(portnr > 0 && portnr < MaxSerialPortNum+1);///add by itas109 2014-01-09assert(pPortOwner != NULL);// if the thread is alive: Kill///如果线程存在，则关掉进程if (m_bThreadAlive){do{SetEvent(m_hShutdownEvent);} while (m_bThreadAlive);TRACE("Thread ended\n");}// create eventsif (m_ov.hEvent != NULL)ResetEvent(m_ov.hEvent);elsem_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);if (m_hWriteEvent != NULL)ResetEvent(m_hWriteEvent);elsem_hWriteEvent = CreateEvent(NULL, TRUE, FALSE, NULL);if (m_hShutdownEvent != NULL)ResetEvent(m_hShutdownEvent);elsem_hShutdownEvent = CreateEvent(NULL, TRUE, FALSE, NULL);// initialize the event objects///事件数组初始化，设定优先级别m_hEventArray[0] = m_hShutdownEvent;   // highest prioritym_hEventArray[1] = m_ov.hEvent;m_hEventArray[2] = m_hWriteEvent;// initialize critical section///初始化临界资源InitializeCriticalSection(&m_csCommunicationSync);// set buffersize for writing and save the ownerm_pOwner = pPortOwner;if (m_szWriteBuffer != NULL)delete [] m_szWriteBuffer;m_szWriteBuffer = new char[writebuffersize];m_nPortNr = portnr;m_nWriteBufferSize = writebuffersize;m_dwCommEvents = dwCommEvents;BOOL bResult = FALSE;char *szPort = new char[50];char *szBaud = new char[50];/*多个线程操作相同的数据时，一般是需要按顺序访问的，否则会引导数据错乱，无法控制数据，变成随机变量。为解决这个问题，就需要引入互斥变量，让每个线程都按顺序地访问变量。这样就需要使用EnterCriticalSection和LeaveCriticalSection函数。*/// now it critical!///进入临界区EnterCriticalSection(&m_csCommunicationSync);// if the port is already opened: close it///串口已打开就关掉if (m_hComm != NULL){CloseHandle(m_hComm);m_hComm = NULL;}// prepare port strings///串口参数sprintf(szPort, "\\\\.\\COM%d", portnr);///可以显示COM10以上端口//add by itas109 2014-01-09sprintf(szBaud, "baud=%d parity=%c data=%d stop=%d", baud, parity, databits, stopbits);// get a handle to the port/*通信程序在CreateFile处指定串口设备及相关的操作属性，再返回一个句柄，该句柄将被用于后续的通信操作，并贯穿整个通信过程串口打开后，其属性被设置为默认值，根据具体需要，通过调用GetCommState(hComm,&&dcb)读取当前串口设备控制块DCB设置，修改后通过SetCommState(hComm,&&dcb)将其写入。运用ReadFile()与WriteFile()这两个API函数实现串口读写操作，若为异步通信方式，两函数中最后一个参数为指向OVERLAPPED结构的非空指针，在读写函数返回值为FALSE的情况下，调用GetLastError()函数，返回值为ERROR_IO_PENDING，表明I/O操作悬挂，即操作转入后台继续执行。此时，可以用WaitForSingleObject()来等待结束信号并设置最长等待时间*/m_hComm = CreateFile(szPort,                       // communication port string (COMX)GENERIC_READ | GENERIC_WRITE,    // read/write types0,                               // comm devices must be opened with exclusive accessNULL,                           // no security attributesOPEN_EXISTING,                 // comm devices must use OPEN_EXISTINGFILE_FLAG_OVERLAPPED,         // Async I/O0);                         // template must be 0 for comm devices///创建失败if (m_hComm == INVALID_HANDLE_VALUE){// port not founddelete [] szPort;delete [] szBaud;return FALSE;}// set the timeout values///设置超时m_CommTimeouts.ReadIntervalTimeout = 1000;m_CommTimeouts.ReadTotalTimeoutMultiplier = 1000;m_CommTimeouts.ReadTotalTimeoutConstant = 1000;m_CommTimeouts.WriteTotalTimeoutMultiplier = 1000;m_CommTimeouts.WriteTotalTimeoutConstant = 1000;// configure///配置///分别调用Windows API设置串口参数if (SetCommTimeouts(m_hComm, &m_CommTimeouts))///设置超时{/*若对端口数据的响应时间要求较严格，可采用事件驱动方式。事件驱动方式通过设置事件通知，当所希望的事件发生时，Windows发出该事件已发生的通知，这与DOS环境下的中断方式很相似。Windows定义了9种串口通信事件，较常用的有以下三种：EV_RXCHAR:接收到一个字节，并放入输入缓冲区；EV_TXEMPTY:输出缓冲区中的最后一个字符，发送出去；EV_RXFLAG:接收到事件字符(DCB结构中EvtChar成员)，放入输入缓冲区在用SetCommMask()指定了有用的事件后，应用程序可调用WaitCommEvent()来等待事件的发生。SetCommMask(hComm,0)可使WaitCommEvent()中止*/if (SetCommMask(m_hComm, dwCommEvents))///设置通信事件{if (GetCommState(m_hComm, &m_dcb))///获取当前DCB参数{m_dcb.EvtChar = 'q';///设置字件字符m_dcb.fRtsControl = RTS_CONTROL_ENABLE;       // set RTS bit high!if (BuildCommDCB(szBaud, &m_dcb))///填写DCB结构{if (SetCommState(m_hComm, &m_dcb))///配置DCB; // normal operation... continueelseProcessErrorMessage("SetCommState()");}elseProcessErrorMessage("BuildCommDCB()");}elseProcessErrorMessage("GetCommState()");}elseProcessErrorMessage("SetCommMask()");}elseProcessErrorMessage("SetCommTimeouts()");delete [] szPort;delete [] szBaud;// flush the port///终止读写并清空接收和发送PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);// release critical section///释放临界资源LeaveCriticalSection(&m_csCommunicationSync);TRACE("Initialisation for communicationport %d completed.\nUse Startmonitor to communicate.\n", portnr);return TRUE;
}//
//  The CommThread Function.
///线程函数
///监视线程的大致流程：
///检查串口-->进入循环{WaitCommEvent(不阻塞询问)询问事件-->如果有事件来到-->到相应处理(关闭\读\写)}
//
UINT CSerialPort::CommThread(LPVOID pParam)
{// Cast the void pointer passed to the thread back to// a pointer of CSerialPort class///CSerialPort类的指针CSerialPort *port = (CSerialPort*)pParam;// Set the status variable in the dialog class to// TRUE to indicate the thread is running.///TRUE表示线程正在运行port->m_bThreadAlive = TRUE;   // Misc. variablesDWORD BytesTransfered = 0; DWORD Event = 0;DWORD CommEvent = 0;DWORD dwError = 0;COMSTAT comstat;BOOL  bResult = TRUE;// Clear comm buffers at startup///开始时清除串口缓冲if (port->m_hComm)      // check if the port is openedPurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);// begin forever loop.  This loop will run as long as the thread is alive.///只要线程存在就不断读取数据for (;;) { // Make a call to WaitCommEvent().  This call will return immediatly// because our port was created as an async port (FILE_FLAG_OVERLAPPED// and an m_OverlappedStructerlapped structure specified).  This call will cause the // m_OverlappedStructerlapped element m_OverlappedStruct.hEvent, which is part of the m_hEventArray to // be placed in a non-signeled state if there are no bytes available to be read,// or to a signeled state if there are bytes available.  If this event handle // is set to the non-signeled state, it will be set to signeled when a // character arrives at the port.// we do this for each port!/*WaitCommEvent函数第3个参数1pOverlapped可以是一个OVERLAPPED结构的变量指针，也可以是NULL，当用NULL时，表示该函数是同步的，否则表示该函数是异步的。调用WaitCommEvent时，如果异步操作不能立即完成，会立即返回FALSE，系统在WaitCommEvent返回前将OVERLAPPED结构成员hEvent设为无信号状态，等到产生通信事件时，系统将其置有信号*/bResult = WaitCommEvent(port->m_hComm, &Event, &port->m_ov);///表示该函数是异步的if (!bResult)  { // If WaitCommEvent() returns FALSE, process the last error to determin// the reason..///如果WaitCommEvent返回Error为FALSE，则查询错误信息switch (dwError = GetLastError()) { case ERROR_IO_PENDING:   ///正常情况，没有字符可读{ // This is a normal return value if there are no bytes// to read at the port.// Do nothing and continuebreak;}case 87:///系统错误{// Under Windows NT, this value is returned for some reason.// I have not investigated why, but it is also a valid reply// Also do nothing and continue.break;}default:///发生其他错误，其中有串口读写中断开串口连接的错误{// All other error codes indicate a serious error has// occured.  Process this error.port->ProcessErrorMessage("WaitCommEvent()");break;}}}else ///WaitCommEvent()能正确返回{// If WaitCommEvent() returns TRUE, check to be sure there are// actually bytes in the buffer to read.  //// If you are reading more than one byte at a time from the buffer // (which this program does not do) you will have the situation occur // where the first byte to arrive will cause the WaitForMultipleObjects() // function to stop waiting.  The WaitForMultipleObjects() function // resets the event handle in m_OverlappedStruct.hEvent to the non-signelead state// as it returns.  //// If in the time between the reset of this event and the call to // ReadFile() more bytes arrive, the m_OverlappedStruct.hEvent handle will be set again// to the signeled state. When the call to ReadFile() occurs, it will // read all of the bytes from the buffer, and the program will// loop back around to WaitCommEvent().// // At this point you will be in the situation where m_OverlappedStruct.hEvent is set,// but there are no bytes available to read.  If you proceed and call// ReadFile(), it will return immediatly due to the async port setup, but// GetOverlappedResults() will not return until the next character arrives.//// It is not desirable for the GetOverlappedResults() function to be in // this state.  The thread shutdown event (event 0) and the WriteFile()// event (Event2) will not work if the thread is blocked by GetOverlappedResults().//// The solution to this is to check the buffer with a call to ClearCommError().// This call will reset the event handle, and if there are no bytes to read// we can loop back through WaitCommEvent() again, then proceed.// If there are really bytes to read, do nothing and proceed.bResult = ClearCommError(port->m_hComm, &dwError, &comstat);if (comstat.cbInQue == 0)continue;} // end if bResult///主等待函数，会阻塞线程// Main wait function.  This function will normally block the thread// until one of nine events occur that require action.///等待3个事件：关断/读/写，有一个事件发生就返回Event = WaitForMultipleObjects(3, ///3个事件port->m_hEventArray, ///事件数组FALSE, ///有一个事件发生就返回INFINITE);///超时时间switch (Event){case 0:{// Shutdown event.  This is event zero so it will be// the higest priority and be serviced first.///关断事件，关闭串口CloseHandle(port->m_hComm);port->m_hComm=NULL;port->m_bThreadAlive = FALSE;// Kill this thread.  break is not needed, but makes me feel better.AfxEndThread(100);break;}case 1:    /// read event将定义的各种消息发送出去{memset(&comstat, 0, sizeof(COMSTAT)); GetCommMask(port->m_hComm, &CommEvent);if (CommEvent & EV_RXCHAR)//接收到字符，并置于输入缓冲区中// Receive character event from port.ReceiveChar(port, comstat);if (CommEvent & EV_CTS)//CTS信号状态发生变化::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_CTS_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);if (CommEvent & EV_BREAK)//输入中发生中断              ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_BREAK_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);if (CommEvent & EV_ERR)//发生线路状态错误，线路状态错误包括CE_FRAME,CE_OVERRUN和CE_RXPARITY                   ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_ERR_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);             if (CommEvent & EV_RING)//检测到振铃指示                   ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RING_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);                if (CommEvent & EV_RXFLAG)//接收到事件字符，并置于输入缓冲区中                    ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RXFLAG_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);break;}  case 2: /// write event发送数据{// Write character event from portWriteChar(port);break;}default:{AfxMessageBox("接收有问题!");break;}} // end switch} // close forever loopreturn 0;
}//
// start comm watching
///开启监视线程
//
BOOL CSerialPort::StartMonitoring()
{if (!(m_Thread = AfxBeginThread(CommThread, this)))return FALSE;TRACE("Thread started\n");m_bIsSuspened = false;return TRUE;
}//
// Restart the comm thread
///复位监视线程
//
BOOL CSerialPort::RestartMonitoring()
{TRACE("Thread resumed\n");m_bIsSuspened = false;m_Thread->ResumeThread();return TRUE;
}//
// Suspend the comm thread
///挂起监视线程
//
BOOL CSerialPort::StopMonitoring()
{TRACE("Thread suspended\n");m_bIsSuspened = true;m_Thread->SuspendThread(); return TRUE;
}//
// If there is a error, give the right message
///如果有错误，给出提示
//
void CSerialPort::ProcessErrorMessage(char* ErrorText)
{char *Temp = new char[200];LPVOID lpMsgBuf;FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,NULL,GetLastError(),MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language(LPTSTR) &lpMsgBuf,0,NULL );sprintf(Temp, "WARNING:  %s Failed with the following error: \n%s\nPort: %d\n", (char*)ErrorText, lpMsgBuf, m_nPortNr); MessageBox(NULL, Temp, "Application Error", MB_ICONSTOP);LocalFree(lpMsgBuf);delete [] Temp;return;///
}//
// Write a character.
///写数据
//
void CSerialPort::WriteChar(CSerialPort* port)
{BOOL bWrite = TRUE;BOOL bResult = TRUE;DWORD BytesSent = 0;ResetEvent(port->m_hWriteEvent);///复位写事件句柄// Gain ownership of the critical sectionEnterCriticalSection(&port->m_csCommunicationSync);if (bWrite){// Initailize variablesport->m_ov.Offset = 0;port->m_ov.OffsetHigh = 0;// Clear bufferPurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);///串口写入bResult = WriteFile(port->m_hComm,                           // Handle to COMM Portport->m_szWriteBuffer,                 // Pointer to message buffer in calling finction
//                          strlen((char*)port->m_szWriteBuffer),    // Length of message to sendport->m_nWriteSize,  // Length of message to send // add by mrlong&BytesSent,                                // Where to store the number of bytes sent&port->m_ov);                          // Overlapped structure// deal with any error codesif (!bResult)  {DWORD dwError = GetLastError();switch (dwError){case ERROR_IO_PENDING:{// continue to GetOverlappedResults()BytesSent = 0;bWrite = FALSE;break;}default:{// all other error codesport->ProcessErrorMessage("WriteFile()");break;///}}} else{LeaveCriticalSection(&port->m_csCommunicationSync);}} // end if(bWrite)if (!bWrite){bWrite = TRUE;bResult = GetOverlappedResult(port->m_hComm,   // Handle to COMM port &port->m_ov,      // Overlapped structure&BytesSent,      // Stores number of bytes sentTRUE);            // Wait flagLeaveCriticalSection(&port->m_csCommunicationSync);// deal with the error code //if (!bResult)  ///注释掉了，为什么？{//port->ProcessErrorMessage("GetOverlappedResults() in WriteFile()");}   } // end if (!bWrite)//Verify that the data size send equals what we tried to sendif (BytesSent != port->m_nWriteSize)  // Length of message to send){TRACE("WARNING: WriteFile() error.. Bytes Sent: %d; Message Length: %d\n", BytesSent, strlen((char*)port->m_szWriteBuffer));}
//  ::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_TXEMPTY_DETECTED, (WPARAM) RXBuff, (LPARAM) port->m_nPortNr);
//  ::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_TXEMPTY_DETECTED,0,(LPARAM) port->m_nPortNr);
}//
// Character received. Inform the owner
///读数据
//
void CSerialPort::ReceiveChar(CSerialPort* port, COMSTAT comstat)
{BOOL  bRead = TRUE; BOOL  bResult = TRUE;DWORD dwError = 0;DWORD BytesRead = 0;unsigned char RXBuff;for (;;) { //add by liquanhai  防止死锁   2011-11-06if(WaitForSingleObject(port->m_hShutdownEvent,0) == WAIT_OBJECT_0)return;// Gain ownership of the comm port critical section.// This process guarantees no other part of this program // is using the port object. EnterCriticalSection(&port->m_csCommunicationSync);// ClearCommError() will update the COMSTAT structure and// clear any other errors.///更新COMSTATbResult = ClearCommError(port->m_hComm, &dwError, &comstat);LeaveCriticalSection(&port->m_csCommunicationSync);// start forever loop.  I use this type of loop because I// do not know at runtime how many loops this will have to// run. My solution is to start a forever loop and to// break out of it when I have processed all of the// data available.  Be careful with this approach and// be sure your loop will exit.// My reasons for this are not as clear in this sample // as it is in my production code, but I have found this // solutiion to be the most efficient way to do this.///所有字符均被读出，中断循环if (comstat.cbInQue == 0){// break out when all bytes have been readbreak;}EnterCriticalSection(&port->m_csCommunicationSync);if (bRead){///串口读出，读出缓冲区中字节bResult = ReadFile(port->m_hComm,       // Handle to COMM port &RXBuff,             // RX Buffer Pointer1,                  // Read one byte&BytesRead,         // Stores number of bytes read&port->m_ov);      // pointer to the m_ov structure// deal with the error code ///若返回错误，错误处理if (!bResult)  { switch (dwError = GetLastError()) { case ERROR_IO_PENDING:    { // asynchronous i/o is still in progress // Proceed on to GetOverlappedResults();///异步IO仍在进行bRead = FALSE;break;}default:{// Another error has occured.  Process this error.port->ProcessErrorMessage("ReadFile()");break;//return;///防止读写数据时，串口非正常断开导致死循环一直执行。add by itas109 2014-01-09 与上面liquanhai添加防死锁的代码差不多} }}else///ReadFile返回TRUE{// ReadFile() returned complete. It is not necessary to call GetOverlappedResults()bRead = TRUE;}}  // close if (bRead)///异步IO操作仍在进行，需要调用GetOverlappedResult查询if (!bRead){bRead = TRUE;bResult = GetOverlappedResult(port->m_hComm,   // Handle to COMM port &port->m_ov,      // Overlapped structure&BytesRead,      // Stores number of bytes readTRUE);            // Wait flag// deal with the error code if (!bResult)  {port->ProcessErrorMessage("GetOverlappedResults() in ReadFile()");}    }  // close if (!bRead)LeaveCriticalSection(&port->m_csCommunicationSync);// notify parent that a byte was received::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_RXCHAR, (WPARAM) RXBuff, (LPARAM) port->m_nPortNr);} // end forever loop}//
// Write a string to the port
//
void CSerialPort::WriteToPort(char* string)
{       assert(m_hComm != 0);memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));strcpy(m_szWriteBuffer, string);m_nWriteSize=strlen(string);// set event for writeSetEvent(m_hWriteEvent);
}void CSerialPort::WriteToPort(char* string,int n)
{       assert(m_hComm != 0);memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
//  memset(m_szWriteBuffer, 0, n);
//  strncpy(m_szWriteBuffer, string, n);memcpy(m_szWriteBuffer, string, n);m_nWriteSize=n;// set event for writeSetEvent(m_hWriteEvent);
}void CSerialPort::WriteToPort(LPCTSTR string,int n)
{       assert(m_hComm != 0);memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));memcpy(m_szWriteBuffer, string, n);m_nWriteSize = n;// set event for writeSetEvent(m_hWriteEvent);
}void CSerialPort::WriteToPort(LPCTSTR string)
{       assert(m_hComm != 0);memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));strcpy(m_szWriteBuffer, string);m_nWriteSize=strlen(string);// set event for writeSetEvent(m_hWriteEvent);
}void CSerialPort::WriteToPort(BYTE* Buffer, int n)
{assert(m_hComm != 0);memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));int i;for(i=0; i<n; i++){m_szWriteBuffer[i] = Buffer[i];}m_nWriteSize=n;// set event for writeSetEvent(m_hWriteEvent);
}//
// Return the device control block
//
DCB CSerialPort::GetDCB()
{return m_dcb;
}//
// Return the communication event masks
//
DWORD CSerialPort::GetCommEvents()
{return m_dwCommEvents;
}//
// Return the output buffer size
//
DWORD CSerialPort::GetWriteBufferSize()
{return m_nWriteBufferSize;
}void CSerialPort::ClosePort()
{if(m_bIsSuspened){RestartMonitoring();}if (m_bThreadAlive){MSG message;while (m_bThreadAlive){//add by liquanhai  防止死锁  2011-11-06if(::PeekMessage(&message, m_pOwner->m_hWnd, 0, 0, PM_REMOVE)){::TranslateMessage(&message);::DispatchMessage(&message);}SetEvent(m_hShutdownEvent);}TRACE("Thread ended\n");}if(m_szWriteBuffer != NULL){delete [] m_szWriteBuffer;m_szWriteBuffer = NULL;}if(m_hComm){CloseHandle(m_hComm);m_hComm = NULL;}// Close Handles  if(m_hShutdownEvent!=NULL)ResetEvent(m_hShutdownEvent);if(m_ov.hEvent!=NULL)ResetEvent(m_ov.hEvent);if(m_hWriteEvent!=NULL)ResetEvent(m_hWriteEvent);
}void CSerialPort::SendData(LPCTSTR lpszData, const int nLength)
{assert(m_hComm != 0);memset(m_szWriteBuffer, 0, nLength);strcpy(m_szWriteBuffer, lpszData);m_nWriteSize=nLength;// set event for writeSetEvent(m_hWriteEvent);
}BOOL CSerialPort::RecvData(LPTSTR lpszData, const int nSize)
{////接收数据//assert(m_hComm!=0);memset(lpszData,0,nSize);DWORD mylen  = 0;DWORD mylen2 = 0;while (mylen < nSize) {if(!ReadFile(m_hComm,lpszData,nSize,&mylen2,NULL)) return FALSE;mylen += mylen2;   }return TRUE;
}COMMTIMEOUTS CSerialPort:: GetCommTimeOuts()
{return m_CommTimeouts;
}BOOL CSerialPort::SetCommTimeOuts(COMMTIMEOUTS *lpTimeOuts)
{SetCommTimeouts(m_hComm, lpTimeOuts);//设置超时 return true;
}
/*
void CSerialPort::ClosePort()
{do{SetEvent(m_hShutdownEvent);} while (m_bThreadAlive);// if the port is still opened: close it if (m_hComm != NULL){CloseHandle(m_hComm);m_hComm = NULL;}// Close Handles  if(m_hShutdownEvent!=NULL)CloseHandle( m_hShutdownEvent); if(m_ov.hEvent!=NULL)CloseHandle( m_ov.hEvent ); if(m_hWriteEvent!=NULL)CloseHandle( m_hWriteEvent ); TRACE("Thread ended\n");delete [] m_szWriteBuffer;
}
*///
///查询注册表的串口号，将值存于数组中
///本代码参考于mingojiang的获取串口逻辑名代码
//
void CSerialPort::QueryKey(HKEY hKey)
{ #define MAX_KEY_LENGTH 255#define MAX_VALUE_NAME 16383//  TCHAR    achKey[MAX_KEY_LENGTH];   // buffer for subkey name//  DWORD    cbName;                   // size of name string TCHAR    achClass[MAX_PATH] = TEXT("");  // buffer for class name DWORD    cchClassName = MAX_PATH;  // size of class string DWORD    cSubKeys=0;               // number of subkeys DWORD    cbMaxSubKey;              // longest subkey size DWORD    cchMaxClass;              // longest class string DWORD    cValues;              // number of values for key DWORD    cchMaxValue;          // longest value name DWORD    cbMaxValueData;       // longest value data DWORD    cbSecurityDescriptor; // size of security descriptor FILETIME ftLastWriteTime;      // last write time DWORD i, retCode; TCHAR  achValue[MAX_VALUE_NAME]; DWORD cchValue = MAX_VALUE_NAME; // Get the class name and the value count. retCode = RegQueryInfoKey(hKey,                    // key handle achClass,                // buffer for class name &cchClassName,           // size of class string NULL,                    // reserved &cSubKeys,               // number of subkeys &cbMaxSubKey,            // longest subkey size &cchMaxClass,            // longest class string &cValues,                // number of values for this key &cchMaxValue,            // longest value name &cbMaxValueData,         // longest value data &cbSecurityDescriptor,   // security descriptor &ftLastWriteTime);       // last write time for (i=0;i<20;i++)///存放串口号的数组初始化{m_nComArray[i] = -1;}// Enumerate the key values. if (cValues > 0) {for (i=0, retCode=ERROR_SUCCESS; i<cValues; i++) { cchValue = MAX_VALUE_NAME;  achValue[0] = '\0'; if (ERROR_SUCCESS == RegEnumValue(hKey, i, achValue, &cchValue, NULL, NULL, NULL, NULL))  { CString szName(achValue);if (-1 != szName.Find(_T("Serial")) || -1 != szName.Find(_T("VCom")) ){BYTE strDSName[10]; memset(strDSName, 0, 10);DWORD nValueType = 0, nBuffLen = 10;if (ERROR_SUCCESS == RegQueryValueEx(hKey, (LPCTSTR)achValue, NULL, &nValueType, strDSName, &nBuffLen)){int nIndex = -1;while(++nIndex < MaxSerialPortNum){if (-1 == m_nComArray[nIndex]) {m_nComArray[nIndex] = atoi((char*)(strDSName + 3));break;}}}}} }}else{AfxMessageBox(_T("本机没有串口....."));}}void CSerialPort::Hkey2ComboBox(CComboBox& m_PortNO)
{HKEY hTestKey;bool Flag = FALSE;///仅是XP系统的注册表位置，其他系统根据实际情况做修改if(ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("HARDWARE\\DEVICEMAP\\SERIALCOMM"), 0, KEY_READ, &hTestKey) ){QueryKey(hTestKey);}RegCloseKey(hTestKey);int i = 0;m_PortNO.ResetContent();///刷新时，清空下拉列表内容while(i < MaxSerialPortNum && -1 != m_nComArray[i]){CString szCom; szCom.Format(_T("COM%d"), m_nComArray[i]);m_PortNO.InsertString(i, szCom.GetBuffer(5));++i;Flag = TRUE;if (Flag)///把第一个发现的串口设为下拉列表的默认值m_PortNO.SetCurSel(0);}}