求救：监听线程时出现如下错误

Question

Unhandled exception at 0x004edda7 in imsi_tool.exe: 0xC0000005: Access violation reading location 0x000004dc.DWORD ThreadFunction(LPVOID pParam)//线程函数
{
   DWORD dwEvtMask ,dwResult;
   tOverLaped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);//创建一个事件
   
   while(IsFun)
   {
      //等待窗口事件
      WaitCommEvent(((Cimsi_toolDlg*)AfxGetMainWnd())->h_Com,&dwEvtMask, &tOverLaped);
      //如果事件没有信号,延时0.1秒
      dwResult = WaitForSingleObject(tOverLaped.hEvent, 100);      if(dwResult == WAIT_OBJECT_0) //事件对象有信号
      {
         if(dwEvtMask == EV_RXCHAR) //接收到数据
         {
            if(IsStop)//发送停止
            {
               IsStop = FALSE;
               //发送消息,由消息处理函数接收数据
               ::PostMessage(AfxGetMainWnd()->m_hWnd, CM_RECEIVE, 0,(LPARAM)EV_RXCHAR);
            } 
         } 
      }
   }
   
   return 0;
}经调试时死在WaitCommEvent(((Cimsi_toolDlg*)AfxGetMainWnd())->h_Com,&dwEvtMask, &tOverLaped);
这行

Answer 1

AfxGetMainWnd())->h_Com  是否有效

Answer 2

h_Com = CreateFile(strCom, GENERIC_READ|GENERIC_WRITE, 0,NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
 
   if (h_Com==INVALID_HANDLE_VALUE)
   { 
   AfxMessageBox(_T("端口打开失败."));
   return;
   }这个打开端口是可以的

Answer 3

WaitCommEvent(((Cimsi_toolDlg*)AfxGetMainWnd())->h_Com,&dwEvtMask, &tOverLaped);
这句有问题在线程中一般不这样用AfxGetMainWnd()
通过 pParam传个Cimsi_toolDlg* 指针

Answer 4

DWORD param;
   hThread = CreateThread((LPSECURITY_ATTRIBUTES)NULL, 0, (LPTHREAD_START_ROUTINE)ThreadFunction,&param,0, &dwThreadID);
   if (hThread == INVALID_HANDLE_VALUE)
   {
      AfxMessageBox(_T("线程创建失败"));
      return;
   }如何加啊？

Answer 5

DWORD param;
Cimsi_toolDlg* pDlg = XXXX;
param = (LPVOID) pDlg;
hThread = CreateThread((LPSECURITY_ATTRIBUTES)NULL, 0, (LPTHREAD_START_ROUTINE)ThreadFunction,&param,0, &dwThreadID);线程中解开
DWORD ThreadFunction(LPVOID pParam)//线程函数
{
     Cimsi_toolDlg* pDlg = （Cimsi_toolDlg*）pParam;
}

Answer 6

谢谢Jarrylogin，已修正如下：hThread = CreateThread((LPSECURITY_ATTRIBUTES)NULL, 0, (LPTHREAD_START_ROUTINE)ThreadFunction,this,0, &dwThreadID);
   if (hThread == INVALID_HANDLE_VALUE)
   {
      AfxMessageBox(_T("线程创建失败"));
      return;
   }
DWORD ThreadFunction(LPVOID pParam)//线程函数
{
   DWORD dwEvtMask ,dwResult;
   Cimsi_toolDlg* pDlg = (Cimsi_toolDlg*)pParam;   tOverLaped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);//创建一个事件
   
   while(1)
   {
      //等待窗口事件
      WaitCommEvent(pDlg->h_Com,&dwEvtMask, &tOverLaped);
      //如果事件没有信号,延时0.1秒
      dwResult = WaitForSingleObject(tOverLaped.hEvent, 100);      if(dwResult == WAIT_OBJECT_0) //事件对象有信号
      {
         if(dwEvtMask == EV_RXCHAR) //接收到数据
         {
            if(IsStop)//发送停止
            {
               IsStop = FALSE;
               //发送消息,由消息处理函数接收数据
               ::PostMessage(AfxGetMainWnd()->m_hWnd, CM_RECEIVE, 0,(LPARAM)EV_RXCHAR);
            } 
         } 
      }
   }
   
   return 0;
}