SerialPort类
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做个记录自己看。
串口：USB-232（最好使用最新版的驱动）
SerialPort.h
#ifndef __SERIALPORT_H__ #define __SERIALPORT_H__ #define WM_COMM_BREAK_DETECTED WM_USER+1 #define WM_COMM_CTS_DETECTED WM_USER+2 #define WM_COMM_DSR_DETECTED WM_USER+3 #define WM_COMM_ERR_DETECTED WM_USER+4 #define WM_COMM_RING_DETECTED WM_USER+5 #define WM_COMM_RLSD_DETECTED WM_USER+6 #define WM_COMM_RXCHAR WM_USER+7 #define WM_COMM_RXFLAG_DETECTED WM_USER+8 #define WM_COMM_TXEMPTY_DETECTED WM_USER+9 class CSerialPort { public: void CloseComm();//2 // CSerialPort(); virtual ~CSerialPort(); // BOOL InitPort(CWnd* pPortOwner, UINT portnr, UINT baud, char parity, UINT databits, UINT stopsbits, DWORD dwCommEvents, UINT nBufferSize); // BOOL StartMonitoring(); BOOL RestartMonitoring(); BOOL StopMonitoring(); DWORD GetWriteBufferSize(); DWORD GetCommEvents(); DCB GetDCB(); void WriteToPort(char* string); protected: // void ProcessErrorMessage(char* ErrorText); static UINT CommThread(LPVOID pParam); static void ReceiveChar(CSerialPort* port, COMSTAT comstat); static void WriteChar(CSerialPort* port); // CWinThread* m_Thread; // CRITICAL_SECTION m_csCommunicationSync; BOOL m_bThreadAlive; // HANDLE m_hShutdownEvent; HANDLE m_hComm; HANDLE m_hWriteEvent; // HANDLE m_hEventArray[3]; // OVERLAPPED m_ov; COMMTIMEOUTS m_CommTimeouts; DCB m_dcb; // CWnd* m_pOwner; // UINT m_nPortNr; char* m_szWriteBuffer; DWORD m_dwCommEvents; DWORD m_nWriteBufferSize; }; #endif __SERIALPORT_H__ SerialPort.cpp
#include "stdafx.h" #include "SerialPort.h" #include <assert.h> CSerialPort::CSerialPort() { m_hComm = NULL; m_ov.Offset = 0; m_ov.OffsetHigh = 0; m_ov.hEvent = NULL; m_hWriteEvent = NULL; m_hShutdownEvent = NULL; m_szWriteBuffer = NULL; m_bThreadAlive = FALSE; } // // // CSerialPort::~CSerialPort() { do { SetEvent(m_hShutdownEvent); } while (m_bThreadAlive); TRACE("Thread ended\n"); delete[] m_szWriteBuffer; } // // // BOOL CSerialPort::InitPort(CWnd* pPortOwner, // UINT portnr, // UINT baud, // char parity, // UINT databits, // UINT stopbits, // DWORD dwCommEvents, // UINT writebuffersize) // { assert(portnr > 0 && portnr <= 256); assert(pPortOwner != NULL); unsigned int t = 0; // if (m_bThreadAlive) { MSG message; while (m_bThreadAlive) { if (::PeekMessage(&message, m_pOwner->m_hWnd, 0, 0, PM_REMOVE)) { ::TranslateMessage(&message); ::DispatchMessage(&message); } SetEvent(m_hShutdownEvent); } TRACE("Thread ended\n"); } // if (m_ov.hEvent != NULL) ResetEvent(m_ov.hEvent); m_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); if (m_hWriteEvent != NULL) ResetEvent(m_hWriteEvent); m_hWriteEvent = CreateEvent(NULL, TRUE, FALSE, NULL); if (m_hShutdownEvent != NULL) ResetEvent(m_hShutdownEvent); m_hShutdownEvent = CreateEvent(NULL, TRUE, FALSE, NULL); // m_hEventArray[0] = m_hShutdownEvent; // m_hEventArray[1] = m_ov.hEvent; m_hEventArray[2] = m_hWriteEvent; // InitializeCriticalSection(&m_csCommunicationSync); // m_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]; // EnterCriticalSection(&m_csCommunicationSync); // if (m_hComm != NULL) { CloseHandle(m_hComm); m_hComm = NULL; } // // if (portnr<10) { sprintf(szPort, "COM%d", portnr); } else { sprintf(szPort, "\\\\.\\COM%d", portnr); } sprintf(szBaud, "baud=%d parity=%c data=%d stop=%d", baud, parity, databits, stopbits); // m_hComm = CreateFile(szPort, // GENERIC_READ | GENERIC_WRITE, // 0, // NULL, // OPEN_EXISTING, // FILE_FLAG_OVERLAPPED, // 0); // if (m_hComm == INVALID_HANDLE_VALUE) { // delete[] szPort; delete[] szBaud; return FALSE; } // m_CommTimeouts.ReadIntervalTimeout = 1000; m_CommTimeouts.ReadTotalTimeoutMultiplier = 1000; m_CommTimeouts.ReadTotalTimeoutConstant = 1000; m_CommTimeouts.WriteTotalTimeoutMultiplier = 1000; m_CommTimeouts.WriteTotalTimeoutConstant = 1000; // if (SetCommTimeouts(m_hComm, &m_CommTimeouts)) { if (SetCommMask(m_hComm, dwCommEvents)) { if (GetCommState(m_hComm, &m_dcb)) { m_dcb.fRtsControl = RTS_CONTROL_ENABLE; // if (BuildCommDCB(szBaud, &m_dcb)) { m_dcb.XonLim = 2048; m_dcb.XoffLim = 2048; if (SetCommState(m_hComm, &m_dcb)) ; // else ProcessErrorMessage("SetCommState()"); } else ProcessErrorMessage("BuildCommDCB()"); } else ProcessErrorMessage("GetCommState()"); } else ProcessErrorMessage("SetCommMask()"); } else ProcessErrorMessage("SetCommTimeouts()"); delete[] szPort; delete[] szBaud; // PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT); // LeaveCriticalSection(&m_csCommunicationSync); TRACE("Initialisation for communicationport %d completed.\nUse Startmonitor to communicate.\n", portnr); return TRUE; } // // // UINT CSerialPort::CommThread(LPVOID pParam) { // // CSerialPort *port = (CSerialPort*)pParam; // // port->m_bThreadAlive = TRUE; // DWORD BytesTransfered = 0; DWORD Event = 0; DWORD CommEvent = 0; DWORD dwError = 0; static COMSTAT comstat; BOOL bResult = TRUE; // if (port->m_hComm) // PurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT); // for (;;) { bResult = WaitCommEvent(port->m_hComm, &Event, &port->m_ov); if (!bResult) { // // switch (dwError = GetLastError()) { case ERROR_IO_PENDING: { // // // break; } case 87: { // // // break; } default: { // // port->ProcessErrorMessage("WaitCommEvent()"); break; } } } else { bResult = ClearCommError(port->m_hComm, &dwError, &comstat); if (comstat.cbInQue == 0) continue; } // // // Event = WaitForMultipleObjects(3, port->m_hEventArray, FALSE, INFINITE); switch (Event) { case 0: { // // port->m_bThreadAlive = FALSE; // AfxEndThread(100); break; } case 1: // { GetCommMask(port->m_hComm, &CommEvent); if (CommEvent & EV_CTS) ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_CTS_DETECTED, (WPARAM)0, (LPARAM)port->m_nPortNr); if (CommEvent & EV_RXFLAG) ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RXFLAG_DETECTED, (WPARAM)0, (LPARAM)port->m_nPortNr); if (CommEvent & EV_BREAK) ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_BREAK_DETECTED, (WPARAM)0, (LPARAM)port->m_nPortNr); if (CommEvent & EV_ERR) ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_ERR_DETECTED, (WPARAM)0, (LPARAM)port->m_nPortNr); if (CommEvent & EV_RING) ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RING_DETECTED, (WPARAM)0, (LPARAM)port->m_nPortNr); if (CommEvent & EV_RXCHAR) // ReceiveChar(port, comstat); break; } case 2: // { // WriteChar(port); break; } } // } // return 0; } // // // BOOL CSerialPort::StartMonitoring() { if (!(m_Thread = AfxBeginThread(CommThread, this))) return FALSE; TRACE("Thread started\n"); return TRUE; } // // // BOOL CSerialPort::RestartMonitoring() { TRACE("Thread resumed\n"); m_Thread->ResumeThread(); return TRUE; } // // // BOOL CSerialPort::StopMonitoring() { TRACE("Thread suspended\n"); m_Thread->SuspendThread(); return TRUE; } // // // 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), // (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; } // // // void CSerialPort::WriteChar(CSerialPort* port) { BOOL bWrite = TRUE; BOOL bResult = TRUE; DWORD BytesSent = 0; ResetEvent(port->m_hWriteEvent); // EnterCriticalSection(&port->m_csCommunicationSync); if (bWrite) { // port->m_ov.Offset = 0; port->m_ov.OffsetHigh = 0; // PurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT); bResult = WriteFile(port->m_hComm, // port->m_szWriteBuffer, // strlen((char*)port->m_szWriteBuffer), // &BytesSent, // &port->m_ov); // // if (!bResult) { DWORD dwError = GetLastError(); switch (dwError) { case ERROR_IO_PENDING: { // BytesSent = 0; bWrite = FALSE; break; } default: { // port->ProcessErrorMessage("WriteFile()"); } } } else { LeaveCriticalSection(&port->m_csCommunicationSync); } } // if (!bWrite) { bWrite = TRUE; bResult = GetOverlappedResult(port->m_hComm, // &port->m_ov, // &BytesSent, // TRUE); // LeaveCriticalSection(&port->m_csCommunicationSync); // if (!bResult) { port->ProcessErrorMessage("GetOverlappedResults() in WriteFile()"); } } // // if (BytesSent != strlen((char*)port->m_szWriteBuffer)) { TRACE("WARNING: WriteFile() error.. Bytes Sent: %d; Message Length: %d\n", BytesSent, strlen((char*)port->m_szWriteBuffer)); } } // // // void CSerialPort::ReceiveChar(CSerialPort* port, COMSTAT comstat) { BOOL bRead = TRUE; BOOL bResult = TRUE; DWORD dwError = 0; DWORD BytesRead = 0; unsigned char RXBuff; for (;;) { // // // EnterCriticalSection(&port->m_csCommunicationSync); // // bResult = ClearCommError(port->m_hComm, &dwError, &comstat); LeaveCriticalSection(&port->m_csCommunicationSync); if (comstat.cbInQue == 0) { // break; } EnterCriticalSection(&port->m_csCommunicationSync); if (bRead) { bResult = ReadFile(port->m_hComm, // &RXBuff, // 1, // &BytesRead, // &port->m_ov); // // if (!bResult) { switch (dwError = GetLastError()) { case ERROR_IO_PENDING: { // // bRead = FALSE; break; } default: { // port->ProcessErrorMessage("ReadFile()"); break; } } } else { // bRead = TRUE; } } // if (!bRead) { bRead = TRUE; bResult = GetOverlappedResult(port->m_hComm, // &port->m_ov, // &BytesRead, // TRUE); // // if (!bResult) { port->ProcessErrorMessage("GetOverlappedResults() in ReadFile()"); } } // LeaveCriticalSection(&port->m_csCommunicationSync); // ::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_RXCHAR, (WPARAM)RXBuff, (LPARAM)port->m_nPortNr); } // } // // // void CSerialPort::WriteToPort(char* string) { assert(m_hComm != 0); memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer)); strcpy(m_szWriteBuffer, string); // SetEvent(m_hWriteEvent); } // // // DCB CSerialPort::GetDCB() { return m_dcb; } // // // DWORD CSerialPort::GetCommEvents() { return m_dwCommEvents; } // // // DWORD CSerialPort::GetWriteBufferSize() { return m_nWriteBufferSize; } void CSerialPort::CloseComm() { CloseHandle(m_hComm); } 0 0
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