封装得比较完整的串口类接口，支持同步、异步操作，具有工业强度，我在BC, BCB, VC, BCBX, GCC下编译通过.rar

/* 串口基础类库（WIN32） ver 0.2 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 copyright(c) 2004.8 llbird wushaojian@21cn.com */ #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 #define ON_COM_RECEIVE WM_USER + 618 // WPARAM 端口号 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; } //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 = dwByteSize; _DCB.Parity = dwParity; _DCB.StopBits = 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; DWORD dwError; if(::ClearCommError(_hCommHandle, &dwError, NULL) && dwError > 0) //清除错误 ::PurgeComm(_hCommHandle, PURGE_TXABORT | PURGE_TXCLEAR); va_list va; va_start(va, szFormat); _vsnprintf(szBuffer, dwBufferLength, szFormat, va); va_end(va); unsigned long uWriteLength = 0; if(!::WriteFile(_hCommHandle, szBuffer, dwBufferLength, &uWriteLength, &_WriteOverlapped)) if(::GetLastError() != ERROR_IO_PENDING) uWriteLength = 0; return uWriteLength; } //关闭串口 inline virtual void Close() { if(IsOpen()) { EndThread(); ::CloseHandle(_hCommHandle); _hCommHandle = INVALID_HANDLE_VALUE; } } //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 OVERLAPP