多线程实现COM通信source code

      下面的源代码是大学时在一本书上抄录的,发现还是挺简单实用的,其用多线程实现COM口通信.CCom类为一对话框类,运行效果如附件,可正常实现COM口收发数据.

 

下面分别贴上其.h文件和.cpp文件

 

.h source code

 

#if !defined(AFX_COM_H__0BA6BAE9_704D_444A_BEF7_B10D828C08F5__INCLUDED_)#define AFX_COM_H__0BA6BAE9_704D_444A_BEF7_B10D828C08F5__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000// Com.h : header file//#define WM_USERUPDATE WM_USER+100UINT ReadProc(LPVOID param) ;/////////////////////////////////////////////////////////////////////////////// CCom dialogclass CCom : public CDialog{// Constructionpublic:CCom(CWnd* pParent = NULL); // standard constructor// Dialog Data//{{AFX_DATA(CCom)enum { IDD = IDD_conn };CStringm_sendData;CStringm_receiveData;//}}AFX_DATAvoid OnReceive();LONG OnUserUpdate(WPARAM wParam,LPARAM lParam);// Overrides// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CCom)protected:virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support//}}AFX_VIRTUAL// Implementationprotected: // Generated message map functions//{{AFX_MSG(CCom)virtual void OnOK();virtual void OnCancel();virtual BOOL OnInitDialog();afx_msg void OnChangere();afx_msg void OnSend();afx_msg void OnConfig();afx_msg void OnClear();//}}AFX_MSGDECLARE_MESSAGE_MAP()};//{{AFX_INSERT_LOCATION}}// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_COM_H__0BA6BAE9_704D_444A_BEF7_B10D828C08F5__INCLUDED_)

 

.cpp source code

 

 

// Com.cpp : implementation file//#include "stdafx.h"#include "Com.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endifDCB dcb; //编程配置串口结构HANDLE hCom1; //通信资源句柄DWORD dwError,dwEvtMask,dwEvent;BOOL fSuccess; //判断串口是否打开成功CString receiveData;OVERLAPPED o;COMMPROP CommProp; //串口信息结构，不可更改COMMTIMEOUTS timeouts; //定义超时设置结构COMSTAT cs;char input[1000];HWND hWndUpdate;int t=50;/////////////////////////////////////////////////////////////////////////////// CCom dialogCCom::CCom(CWnd* pParent /*=NULL*/): CDialog(CCom::IDD, pParent){//{{AFX_DATA_INIT(CCom)m_sendData = _T("");m_receiveData = _T("");//}}AFX_DATA_INIT}void CCom::DoDataExchange(CDataExchange* pDX){CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CCom)DDX_Text(pDX, IDC_se, m_sendData);DDX_Text(pDX, IDC_re, m_receiveData);//}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CCom, CDialog)//{{AFX_MSG_MAP(CCom)ON_EN_CHANGE(IDC_re, OnChangere)ON_BN_CLICKED(IDC_BUTTON1, OnSend)ON_BN_CLICKED(IDC_BUTTON3, OnConfig)ON_BN_CLICKED(IDC_BUTTON4, OnClear)//ON_MESSAGE(WM_USERUPDATE,OnUserUpdate)//}}AFX_MSG_MAPON_MESSAGE(WM_USERUPDATE,OnUserUpdate)END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CCom message handlersvoid CCom::OnOK() {// TODO: Add extra validation here}void CCom::OnCancel() { CloseHandle(hCom1);CDialog::OnCancel();}void CCom::OnReceive() {HWND hWndread=GetSafeHwnd();AfxBeginThread(ReadProc,hWndread,THREAD_PRIORITY_NORMAL);}BOOL CCom::OnInitDialog() {CDialog::OnInitDialog();//打开COM1口hCom1=CreateFile("COM1", //COM1口GENERIC_READ|GENERIC_WRITE, //访问类型可读写0, //独占串口NULL, //无安全属性OPEN_EXISTING, //打开已存在的串口FILE_FLAG_OVERLAPPED, //异步串口NULL); //模块句柄为空if(hCom1==INVALID_HANDLE_VALUE) //检测打开是否成功{MessageBox("打开串口错误！");return 1;}SetupComm(hCom1,1024,1024); //设置接收，发送缓冲区各1024字节//定义串口fSuccess=GetCommState(hCom1,&dcb); //获取DCB结构if(!fSuccess){MessageBox("获取DCB结构错误！");return 1;}dcb.BaudRate=9600; //定义9600波特率dcb.ByteSize=8; //定义串口的数据位数8dcb.Parity=NOPARITY; //无奇偶校验dcb.StopBits=ONESTOPBIT; //一位停止位fSuccess=SetCommState(hCom1,&dcb); //设置串口 if(!fSuccess) //检测串口DCB结构设置是否正确{ MessageBox("DCB结构设置错误！");return 1;}//超时设定GetCommTimeouts(hCom1,&timeouts);timeouts.ReadIntervalTimeout=MAXDWORD; //读区间超时设定timeouts.ReadTotalTimeoutConstant=1000;timeouts.WriteTotalTimeoutConstant=1000;SetCommTimeouts(hCom1,&timeouts);hWndUpdate=GetSafeHwnd();OnReceive(); //启动读线程return TRUE; // return TRUE unless you set the focus to a control// EXCEPTION: OCX Property Pages should return FALSE}/*UINT CommProc(LPVOID pParam){OVERLAPPED os;DWORD dwMask, dwTrans;COMSTAT ComStat;DWORD dwErrorFlags;CTermDoc *pDoc=(CTermDoc*)pParam;memset(&os, 0, sizeof(OVERLAPPED));os.hEvent=CreateEvent(NULL, TRUE, FALSE, NULL);if(os.hEvent==NULL){AfxMessageBox("无法创建事件对象!");return (UINT)-1;}while(pDoc->m_bConnected){ClearCommError(pDoc->m_hCom,&dwErrorFlags,&ComStat);if(ComStat.cbInQue){// 无限等待WM_COMMNOTIFY消息被处理完WaitForSingleObject(pDoc->m_hPostMsgEvent, INFINITE);ResetEvent(pDoc->m_hPostMsgEvent);// 通知视图PostMessage(pDoc->m_hTermWnd, WM_COMMNOTIFY, EV_RXCHAR, 0);continue;}dwMask=0;if(!WaitCommEvent(pDoc->m_hCom, &dwMask, &os)) // 重叠操作{if(GetLastError()==ERROR_IO_PENDING)// 无限等待重叠操作结果GetOverlappedResult(pDoc->m_hCom, &os, &dwTrans, TRUE);else{CloseHandle(os.hEvent);return (UINT)-1;}}}CloseHandle(os.hEvent);return 0;}*/ //another method for receive threadUINT ReadProc(LPVOID param){unsigned long nBytesRead;o.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);while(1){SetCommMask(hCom1,EV_RXCHAR);//设置通信检测事件if(WaitCommEvent(hCom1,&dwEvent,NULL))//检测通信事件{::Sleep(t); //等待t毫秒，以便数据能完全接收。//获取缓冲区字节数ClearCommError(hCom1,&dwError,&cs);if(cs.cbInQue){if(!ReadFile(hCom1,input,cs.cbInQue,&nBytesRead,&o))//读串口{AfxMessageBox("读串口失败！");return 0;}else //读串口成功{//把字符串转换为String型。receiveData=CString(input,nBytesRead);//告诉主线程，数据接收完毕，可以处理数据了。::PostMessage(hWndUpdate,WM_USERUPDATE,0,0);}ResetEvent(o.hEvent); //复位}}PurgeComm(hCom1,PURGE_RXCLEAR); //清输入缓冲区。}return 1;}void CCom::OnChangere() {// TODO: If this is a RICHEDIT control, the control will not// send this notification unless you override the CDialog::OnInitDialog()// function and call CRichEditCtrl().SetEventMask()// with the ENM_CHANGE flag ORed into the mask.// TODO: Add your control notification handler code here}void CCom::OnSend() {unsigned long nToWrite;UpdateData();PurgeComm(hCom1,PURGE_TXCLEAR);//清发送缓冲区PurgeComm(hCom1,PURGE_RXCLEAR);//清接收缓冲区WriteFile(hCom1,m_sendData,m_sendData.GetLength(),&nToWrite,&o); //写串口PurgeComm(hCom1,PURGE_TXCLEAR);//清发送缓冲区}void CCom::OnConfig() {COMMCONFIG cc;cc.dcb=dcb;if(!CommConfigDialog("com1",GetSafeHwnd(),&cc)) return;dcb=cc.dcb;SetCommState(hCom1,&dcb);}void CCom::OnClear() {m_receiveData="";UpdateData(FALSE);}LONG CCom::OnUserUpdate(WPARAM wParam,LPARAM lParam){//等待读线程完毕，或超出定时。m_receiveData+=receiveData;m_receiveData+="/r/n";// m_receive+=m_receiveData;UpdateData(FALSE);return 0;}