串口基础类库（WIN32）ver 0.3 增加的流控制和监测， 增加了监测的项目

/*
串口基础类库（WIN32） ver 0.3

编译器 ： BC++ 5; C++ BUILDER 4, 5, 6, X; VC++ 5, 6; VC.NET;  GCC;

使用:

定义
cnComm MyComm1(false, 0);//第1个参数为是否启动监视线程， 第2个参数为阻塞（0）/异步方式（默认）
cnComm MyComm2;//默认启动监视线程， 异步
cnComm MyComm3(true);//监视线程， 阻塞

打开
MyComm1.Open(1);//1-1024  2k支持1024串口
MyComm1.Open(1, 1200);
MyComm1.Open(1, 9600);
MyComm1.Open(1, "9600,8,n,1");//可使用标准的设置字符串
MyComm1.SetBufferSize(1200, 4800)//设置缓冲区大小,可不用设置
MyComm1.SetState("9600,8,n,1")//修改波特率等

读写

MyComm1.Read(buf, 1000);
MyComm1.Write(buf, 200);

窗口句柄
MyComm1.SetWnd(hWnd);

线程控制下面都有注明就不说了
相应的处理都有对应的处理函数见ThreadFunc;
处理函数均为虚函数,为的是继承扩展;

引脚号 作用 方向
1 DCD　数据载波检测 输入
2 RXD　接收数据 输入
3 TXD　发送数据 输出
4 DTR　数据终端准备就绪 输出
5 SG　信号地  
6 DSR　数据设备准备就绪 输入
7 RTS　请求发送 输出
8 CTS　清除发送 输入
9 RI　振铃指示 输入

copyright(c) 2004.8 llbird [email protected]
*/

#ifndef _CN_COMM_H_
#define _CN_COMM_H_

#pragma warning(disable: 4530)
#pragma warning(disable: 4786)
#pragma warning(disable: 4800)

#include <assert.h>
#include <stdio.h>
#include <windows.h>

//当接受到数据送到窗口的消息 WPARAM 均为串口的端口号
#define ON_COM_RECEIVE WM_USER + 618   
#define ON_COM_CTS     WM_USER + 619 //LPARAM 1 为 有效， 0 为无效
#define ON_COM_DSR     WM_USER + 621 //LPARAM 1 为 有效， 0 为无效
#define ON_COM_RING    WM_USER + 623
#define ON_COM_RLSD    WM_USER + 624
#define ON_COM_BREAK   WM_USER + 625
#define ON_COM_TXEMPTY WM_USER + 626

class cnComm  
{
public:
 cnComm(bool fAutoBeginThread = true, DWORD dwIOMode = FILE_FLAG_OVERLAPPED)
  : _dwIOMode(dwIOMode), _fAutoBeginThread(fAutoBeginThread)
 {
  Init(); 
 }
 virtual ~cnComm()
 {
  Close(); 
  UnInit();
 }
 //打开串口 缺省 9600, 8, n, 1
 inline bool Open(DWORD dwPort)
 {
  return Open(dwPort, 9600);
 }
 //打开串口 缺省 baud_rate, 8, n, 1
 inline bool Open(DWORD dwPort, DWORD dwBaudRate)
 {
  if(dwPort < 1 || dwPort > 1024)
   return false;

  BindCommPort(dwPort);

  if(!OpenCommPort())
   return false;

  if(!SetupPort())
   return false;

  return SetState(dwBaudRate);
 }
 //打开串口, 使用类似"9600, 8, n, 1"的设置字符串设置串口
 inline bool Open(DWORD dwPort, char *szSetStr)
 {
  if(dwPort < 1 || dwPort > 1024)
   return false;

  BindCommPort(dwPort);

  if(!OpenCommPort())
   return false;

  if(!SetupPort())
   return false;

  return SetState(szSetStr);
 }
 //判断串口是或打开
 inline bool IsOpen()
 {
  return _hCommHandle != INVALID_HANDLE_VALUE;
 }

 /*--------------------------------------------------------------------------------------------------*/

 //获得串口句炳
 inline HANDLE GetHandle()
 {
  return _hCommHandle;
 }
 //获得串口句炳
 operator HANDLE()
 {
  return _hCommHandle;
 }
 //设置串口参数：波特率，停止位，等 支持设置字符串 "9600, 8, n, 1"
 bool SetState(char *szSetStr) 
 {
  if(IsOpen())
  {
   if(!::GetCommState(_hCommHandle, &_DCB))
    return false;
   if(!::BuildCommDCB(szSetStr, &_DCB))
    return false;
   return ::SetCommState(_hCommHandle, &_DCB) == TRUE;
  }
  return false;
 }
 //设置串口参数：波特率，停止位
 bool SetState(DWORD dwBaudRate, DWORD dwByteSize = 8, DWORD dwParity = NOPARITY, DWORD dwStopBits = ONESTOPBIT)
 {
  if(IsOpen())
  {
   if(!::GetCommState(_hCommHandle, &_DCB))
    return false;
   _DCB.BaudRate = dwBaudRate;
      _DCB.ByteSize = (unsigned char)dwByteSize;
      _DCB.Parity   = (unsigned char)dwParity;
   _DCB.StopBits = (unsigned char)dwStopBits;
   return ::SetCommState(_hCommHandle, &_DCB) == TRUE;
  }
  return false;
 }
 //设置串口的I/O缓冲区大小
 bool SetBufferSize(DWORD dwInputSize, DWORD dwOutputSize)
 {
  if(IsOpen())
   return ::SetupComm(_hCommHandle, dwInputSize, dwOutputSize);
  return false; 
 }

 /*--------------------------------------------------------------------------------------------------*/

 //读取串口 dwBufferLength - 1 个字符到 szBuffer 返回实际读到的字符数
 DWORD Read(char *szBuffer, DWORD dwBufferLength, DWORD dwWaitTime = 20)
 {
  if(!IsOpen())
   return 0;

  szBuffer[0] = '\0';

  COMSTAT  Stat;
  DWORD dwError;

  if(::ClearCommError(_hCommHandle, &dwError, &Stat) && dwError > 0) //清除错误
  {
   ::PurgeComm(_hCommHandle, PURGE_RXABORT | PURGE_RXCLEAR); /*清除输入缓冲区*/
   return 0;
  }

  if(!Stat.cbInQue)// 缓冲区无数据
   return 0;

  unsigned long uReadLength = 0;

  dwBufferLength = dwBufferLength - 1 > Stat.cbInQue ? Stat.cbInQue : dwBufferLength - 1;

  if(!::ReadFile(_hCommHandle, szBuffer, dwBufferLength, &uReadLength, &_ReadOverlapped)) //2000 下 ReadFile 始终返回 True
  {
   if(::GetLastError() == ERROR_IO_PENDING) // 结束异步I/O
   {
    WaitForSingleObject(_ReadOverlapped.hEvent, dwWaitTime); //等待20ms
    if(!::GetOverlappedResult(_hCommHandle, &_ReadOverlapped, &uReadLength, false))
    {
     if(::GetLastError() != ERROR_IO_INCOMPLETE)//其他错误
       uReadLength = 0;
    }
   }
   else
    uReadLength = 0;
  }
   
  szBuffer[uReadLength] = '\0';
  return uReadLength;
 }

 /*--------------------------------------------------------------------------------------------------*/

 //写串口 szBuffer
 DWORD Write(char *szBuffer, DWORD dwBufferLength)
 {
  if(!IsOpen())
   return 0;
  
  DWORD dwError;

  if(::ClearCommError(_hCommHandle, &dwError, NULL) && dwError > 0) //清除错误
   ::PurgeComm(_hCommHandle, PURGE_TXABORT | PURGE_TXCLEAR); 

  unsigned long uWriteLength = 0;

  if(!::WriteFile(_hCommHandle, szBuffer, dwBufferLength, &uWriteLength, &_WriteOverlapped))
   if(::GetLastError() != ERROR_IO_PENDING)
    uWriteLength = 0;

  return uWriteLength;
 }
 //写串口 szBuffer
 inline DWORD Write(char *szBuffer)
 {
  assert(szBuffer);

  return Write(szBuffer, strlen(szBuffer));
 }
 //强制同步写
 inline DWORD WriteSync(char *szBuffer, DWORD dwBufferLength)
 {
  if(!IsOpen())
   return 0;
  
  DWORD dwError;

  if(::ClearCommError(_hCommHandle, &dwError, NULL) && dwError > 0) //清除错误
   ::PurgeComm(_hCommHandle, PURGE_TXABORT | PURGE_TXCLEAR); 

  unsigned long uWriteLength = 0;

  if(!::WriteFile(_hCommHandle, szBuffer, dwBufferLength, &uWriteLength, NULL))
   if(::GetLastError() != ERROR_IO_PENDING)
    uWriteLength = 0;

  return uWriteLength;
 }
 //写串口 szBuffer 可以输出格式字符串
 DWORD Write(char *szBuffer, DWORD dwBufferLength, char * szFormat, ...)
 {
  if(!IsOpen())
   return 0;
  
  va_list va;
  va_start(va, szFormat);
  _vsnprintf(szBuffer, dwBufferLength, szFormat, va);
  va_end(va);

  return Write(szBuffer);
 }
 //写串口 szBuffer 可以输出格式字符串
 DWORD Write(char *szBuffer, char * szFormat, ...)
 {
  if(!IsOpen())
   return 0;
  
  va_list va;
  va_start(va, szFormat);
  vsprintf(szBuffer, szFormat, va);
  va_end(va);

  return Write(szBuffer);
 }
 /*--------------------------------------------------------------------------------------------------*/
 //关闭串口
 inline virtual void Close()
 {
  if(IsOpen())  
  {
   EndThread();
   ::CloseHandle(_hCommHandle);

   _hCommHandle = INVALID_HANDLE_VALUE;
  }
 }

 /*---------------------------------------------流控制函数---------------------------------------------*/

 //设置串口的DTR信号 true高电平/有效 false低电平 数据终端准备 引脚(9)4  引脚(25)20
 bool SetDTR(bool OnOrOff)
 {
  return IsOpen() ? EscapeCommFunction(_hCommHandle, OnOrOff ? SETDTR : CLRDTR) : false;
 }
 //设置串口的RTS信号 true高电平 false低电平 引脚(9)4  引脚(25)20
 bool SetRTS(bool OnOrOff)
 {
  return IsOpen() ? EscapeCommFunction(_hCommHandle, OnOrOff ? SETRTS : CLRRTS) : false;
 }
 //设置串口的字符传输状态 true终止传输 false恢复传输
 bool SetBreak(bool OnOrOff)
 {
  return IsOpen() ? EscapeCommFunction(_hCommHandle, OnOrOff ? SETBREAK : CLRBREAK) : false;
 }
 
 /*-------------------------------------------辅助线程函数-----------------------------------------------*/

 //设定发送通知, 接受字符最小值
 inline void SetNotifyNum(int iNum)
 {
  _dwNotifyNum = iNum;
 }
 //送消息的窗口句柄
 inline void SetWnd(HWND hWnd)
 {
  _hNotifyWnd = hWnd;
 }
 //辅助线程控制 建监视线程
 bool BeginThread()
 {
  if(!IsThreadRunning())
  {
   _fRunFlag = true;
   _hThreadHandle = NULL;

   DWORD id;

   _hThreadHandle = ::CreateThread(NULL, 0, CommThreadProc, this, 0, &id); //兼容98 故使用&ID

   return (_hThreadHandle != NULL); //辅助线程
  }
  return false;
 }
 //线程是否运行
 inline bool IsThreadRunning()
 {
  return _hThreadHandle != NULL;
 }
 //获得线程句柄
 inline HANDLE GetThread()
 {
  return _hThreadHandle;
 }
 //暂停监视线程
 inline bool SuspendThread()
 {
  return IsThreadRunning() ? ::SuspendThread(_hThreadHandle) != 0xFFFFFFFF : false;
 }
 //恢复监视线程
 inline bool ResumeThread()
 {
  return IsThreadRunning() ? ::ResumeThread(_hThreadHandle) != 0xFFFFFFFF : false;
 }
 //终止线程
 bool EndThread(DWORD dwWaitTime = 100)
 {
  if(IsThreadRunning())
  {
   _fRunFlag = false;
   ::SetCommMask(_hCommHandle, 0);
   ::SetEvent(_WaitOverlapped.hEvent);
   if(::WaitForSingleObject(_hThreadHandle, dwWaitTime) != WAIT_OBJECT_0)
    if(!::TerminateThread(_hThreadHandle, 0))
     return false;

   ::CloseHandle(_hThreadHandle);
   ::ResetEvent(_WaitOverlapped.hEvent);

   _hThreadHandle = NULL;

   return true;
  }
  return false;
 }

protected:

 volatile DWORD _dwPort;  //串口号
 volatile HANDLE _hCommHandle;//串口句柄
 char _szCommStr[20];

 DCB _DCB;     //波特率，停止位，等
 COMMTIMEOUTS _CO;     //超时结构

 DWORD _dwIOMode; // 0 同步  默认 FILE_FLAG_OVERLAPPED 重叠I/O 异步
 OVERLAPPED _ReadOverlapped, _WriteOverlapped; // 重叠I/O

 //线程用
 volatile HANDLE _hThreadHandle; //辅助线程
 volatile HWND _hNotifyWnd; // 通知窗口
 volatile DWORD _dwNotifyNum;//接受多少字节(>_dwNotifyNum)发送通知消息
 volatile bool _fRunFlag; //线程运行循环标志
 bool _fAutoBeginThread;//Open() 自动 BeginThread();
 OVERLAPPED _WaitOverlapped; //WaitCommEvent use

 void Init() //初始化
 {
  memset(_szCommStr, 0, 20);
  memset(&_DCB, 0, sizeof(_DCB));
  _DCB.DCBlength = sizeof(_DCB);
  _hCommHandle = INVALID_HANDLE_VALUE;

  memset(&_ReadOverlapped, 0, sizeof(_ReadOverlapped));
  memset(&_WriteOverlapped, 0, sizeof(_WriteOverlapped));

  _ReadOverlapped.hEvent = ::CreateEvent(NULL, true, false, NULL);
  assert(_ReadOverlapped.hEvent != INVALID_HANDLE_VALUE);
  
  _WriteOverlapped.hEvent = ::CreateEvent(NULL, true, false, NULL);
  assert(_WriteOverlapped.hEvent != INVALID_HANDLE_VALUE);

  _dwNotifyNum = 0;
  _hNotifyWnd = NULL;
  _hThreadHandle = NULL;

  memset(&_WaitOverlapped, 0, sizeof(_WaitOverlapped));
  _WaitOverlapped.hEvent = ::CreateEvent(NULL, true, false, NULL);
  assert(_WaitOverlapped.hEvent != INVALID_HANDLE_VALUE); 
 }  
 void UnInit()
 {
  if(_ReadOverlapped.hEvent != INVALID_HANDLE_VALUE)
   CloseHandle(_ReadOverlapped.hEvent);

  if(_WriteOverlapped.hEvent != INVALID_HANDLE_VALUE)
   CloseHandle(_WriteOverlapped.hEvent);

  if(_WaitOverlapped.hEvent != INVALID_HANDLE_VALUE)
   CloseHandle(_WaitOverlapped.hEvent);
 }
 //绑定串口
 inline void BindCommPort(DWORD dwPort)
 {
  assert(dwPort >= 1 && dwPort <= 1024);

  char p[5];

  _dwPort = dwPort;
  strcpy(_szCommStr, "\\\\.\\COM"); 
  ltoa(_dwPort, p, 10);
  strcat(_szCommStr, p);
 }
 //打开串口
 virtual bool OpenCommPort()
 {
  if(IsOpen())
   Close();

  _hCommHandle = ::CreateFile(
   _szCommStr,
   GENERIC_READ | GENERIC_WRITE,
   0,
   NULL,
   OPEN_EXISTING,
   FILE_ATTRIBUTE_NORMAL | _dwIOMode, 
   NULL
   );

  if(_fAutoBeginThread)
  {
   if(IsOpen() && BeginThread())
    return true;
   else
   {
    Close(); //创建线程失败
    return false;
   }
  }
  return IsOpen();//检测串口是否成功打开
 }
 //设置串口
 virtual bool SetupPort()
 {
  if(!IsOpen())
   return false;

  //设置推荐缓冲区
  if(!::SetupComm(_hCommHandle, 4096, 4096))
   return false; 

  //设置超时时间
  if(!::GetCommTimeouts(_hCommHandle, &_CO))
   return false;
  _CO.ReadIntervalTimeout = 0xFFFFFFFF;
  _CO.ReadTotalTimeoutMultiplier = 0;
  _CO.ReadTotalTimeoutConstant = 0;
  _CO.WriteTotalTimeoutMultiplier = 0;
  _CO.WriteTotalTimeoutConstant = 2000;
  if(!::SetCommTimeouts(_hCommHandle, &_CO))
   return false; 

  //清空串口缓冲区
  if(!::PurgeComm(_hCommHandle, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR ))
   return false; 

  return true;
 } 

 /*---------------------------------------线程监视处理-----------------------------------------------------*/

 //线程收到消息自动调用, 如窗口句柄有效, 送出消息, 包含窗口编号
 virtual void OnReceive()//EV_RXCHAR
 {
  if(_hNotifyWnd)
   ::PostMessage(_hNotifyWnd, ON_COM_RECEIVE, WPARAM(_dwPort), LPARAM(0));
 }
 //获得串口的DSR信号处理
 virtual void OnDSR()
 {
  if(_hNotifyWnd)
  {
   DWORD Status;
   if(GetCommModemStatus(_hCommHandle, &Status))
    ::PostMessage(_hNotifyWnd, ON_COM_DSR, WPARAM(_dwPort), LPARAM( (Status & MS_DSR_ON) ? 1 : 0));
  }
 }
 //获得串口的CTS信号处理
 virtual void OnCTS()
 {
  if(_hNotifyWnd)
  {
   DWORD Status;
   if(GetCommModemStatus(_hCommHandle, &Status))
    ::PostMessage(_hNotifyWnd, ON_COM_CTS, WPARAM(_dwPort), LPARAM( (Status & MS_CTS_ON) ? 1 : 0));
  }
 }
 //获得串口字符传输状态终止传输处理
 virtual void OnBreak()
 {
  if(_hNotifyWnd)
   ::PostMessage(_hNotifyWnd, ON_COM_BREAK , WPARAM(_dwPort), LPARAM(0));
 }
 //获得串口输出完毕信号处理
 virtual void OnTXEmpty()
 {
  if(_hNotifyWnd)
   ::PostMessage(_hNotifyWnd, ON_COM_TXEMPTY, WPARAM(_dwPort), LPARAM(0));
 }
 //错误处理
 virtual void OnError()
 {
  COMSTAT Stat;
  DWORD dwError;
  ::ClearCommError(_hCommHandle, &dwError, NULL);
 }
 //振玲处理
 virtual void OnRing()
 {
  if(_hNotifyWnd)
   ::PostMessage(_hNotifyWnd, ON_COM_RING, WPARAM(_dwPort), LPARAM(0));
 }
 //RLSD信号处理
 virtual void OnRLSD()
 {
  if(_hNotifyWnd)
   ::PostMessage(_hNotifyWnd, ON_COM_RLSD, WPARAM(_dwPort), LPARAM(0));
 }

 //可扩展的线程工作函数
 virtual void ThreadFunc()
 {
  if(!::SetCommMask(_hCommHandle, EV_RXCHAR | EV_ERR | EV_CTS | EV_DSR | EV_BREAK | EV_TXEMPTY | EV_RING | EV_RLSD))
   MessageBox(NULL, "设置监视事件失败, 线程工作无效", "cnComm Class", MB_OK);

  COMSTAT Stat;
  DWORD dwError;

  for(DWORD dwLength, dwMask = 0; _fRunFlag && IsOpen(); dwMask = 0)
  {
   if(!::WaitCommEvent(_hCommHandle, &dwMask, &_WaitOverlapped))
   {
    if(::GetLastError() == ERROR_IO_PENDING)//用于异步
     ::GetOverlappedResult(_hCommHandle, &_WaitOverlapped, &dwLength, TRUE);
    else
     continue;
   }

   switch(dwMask)
   {
   case EV_RXCHAR :
    ::ClearCommError(_hCommHandle, &dwError, &Stat);
    if(Stat.cbInQue > _dwNotifyNum)
     OnReceive();
    break;

   case EV_TXEMPTY :
    OnTXEmpty();
    break;

   case EV_CTS :
    OnCTS();
    break;

   case EV_DSR :
    OnDSR();
    break;
   
   case EV_RING :
    OnRing();
    break;

   case EV_RLSD :
    OnRLSD();
    break;

   case EV_BREAK:
    OnBreak();
    break;

   case EV_ERR :
    OnError();
    break;
   
   }//case
        }//for
 }
 
private:
 //监视线程
 static DWORD WINAPI CommThreadProc(LPVOID lpPara)
 {
  cnComm *pComm = (cnComm *)lpPara;
  pComm->ThreadFunc();
  return 0;
 }
};

#endif //_CN_COMM_H_

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