Re: this->EndDialog hangs with thread

From:
"Scott Kraemer" <skraemer8@cox.net>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 29 Aug 2007 02:06:38 -0700
Message-ID:
<ursGyvh6HHA.1188@TK2MSFTNGP04.phx.gbl>
I changed my code and had a client test it. He still gets a hang on close
and only used the IRC thread.

The only thing I reference inside my thread now is :
 CTest1Dlg *dlg=(CTest1Dlg*) AfxGetApp()->GetMainWnd();

Is this bad to do as well?

which I use for getting the Socket Information that I declared in the
header.
 send(dlg->clisock,User,User.GetLength(),0); //these send irc connect
information to irc server
 send(dlg->clisock,Nick,Nick.GetLength(),0);
 send(dlg->clisock,Join,Join.GetLength(),0);

And I do some receives as well.

 while(s!=SOCKET_ERROR && dlg->ee!=0)
 {

  if (ioctlsocket(s, FIONREAD, &arg) != 0) {
    inputline = ReceiveLine(dlg->clisock); //ReceiveLine is a custom
function I wrote that gets a line of text from input
  }

//switch/case results of inputline
}

All of my output to dialog controls are done through messages:

Inside my CTest1DLG class

Message Map:

 ON_MESSAGE(UWM_ADDSTRING, &CTest1Dlg::OnAddChatString)
 ON_MESSAGE(UWM_ADDUSER, &CTest1Dlg::OnAddChatUser)
 ON_MESSAGE(UWM_DELUSER, &CTest1Dlg::OnDelChatUser)
 ON_MESSAGE(UWM_UPDATESTATS, &CTest1Dlg::OnUpdateStats)

LRESULT CTest1Dlg::OnAddChatString(WPARAM, LPARAM lParam)
    {
     CString * s = (CString *)lParam;
  m_chat.AppendText(*s);
     delete s;
     return 0;
    }
LRESULT CTest1Dlg::OnAddChatUser(WPARAM, LPARAM lParam)
    {
     CString * s = (CString *)lParam;
  m_users.AddString(*s);
     delete s;
     return 0;
    }
LRESULT CTest1Dlg::OnDelChatUser(WPARAM, LPARAM lParam)
    {
     CString * s = (CString *)lParam;
  int nIndex = 0;
  nIndex=m_users.FindStringExact(nIndex, *s);
  m_users.DeleteString(nIndex);
     delete s;
     return 0;
    }

LRESULT CTest1Dlg::OnUpdateStats(WPARAM, LPARAM lParam)
    {
    //too much code to list
    return 0;

}

void AddChatText(CString & name)
    {
     CString * s = new CString(name);
  HWND hWnd=AfxGetApp()->m_pMainWnd->m_hWnd;
 ::PostMessage(hWnd,UWM_ADDSTRING, 0, (LPARAM)s);
    }
void AddChatUser(CString & name)
    {
     CString * s = new CString(name);
  HWND hWnd=AfxGetApp()->m_pMainWnd->m_hWnd;
 ::PostMessage(hWnd,UWM_ADDUSER, 0, (LPARAM)s);
    }
void DelChatUser(CString & name)
    {
     CString * s = new CString(name);
  HWND hWnd=AfxGetApp()->m_pMainWnd->m_hWnd;
 ::PostMessage(hWnd,UWM_DELUSER, 0, (LPARAM)s);
    }
void UpdateStats(CString & name)
    {
     CString * s = new CString(name);
  HWND hWnd=AfxGetApp()->m_pMainWnd->m_hWnd;
 ::PostMessage(hWnd,UWM_UPDATESTATS, 0, (LPARAM)s);
    }

my header file for CTest1DLG: (sniplet)

protected:
 afx_msg LRESULT OnAddChatString(WPARAM, LPARAM);
 afx_msg LRESULT OnAddChatUser(WPARAM, LPARAM lParam);
 afx_msg LRESULT OnDelChatUser(WPARAM, LPARAM lParam);
 afx_msg LRESULT OnUpdateStats(WPARAM, LPARAM lParam);
.....
 friend void AddChatText(CString & name);
 friend void DelChatUser(CString & name);
 friend void AddChatUser(CString & name);
 friend void UpdateStats(CString & name);

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message
news:%23TMj%23zf6HHA.5844@TK2MSFTNGP02.phx.gbl...

"Scott Kraemer" <skraemer8@cox.net> wrote in message
news:uD9hLkf6HHA.4436@TK2MSFTNGP03.phx.gbl...

Okay I sorta have the same problem as Alex posted above. I just wanted
some insight as to see if I am doing this right or wrong. For some
clients it works and some it hangs while closing the main dialog.

My Main dialog starts creates a global socket so I can use it in other
threads declared in main dlg header ( SOCKET clisock; sockaddr_in cli;)

I then start my IRC thread in the InitDialog
ircThread = AfxBeginThread(ircthread, 0);

my ircthread function updates dialog boxes on my main dialog by setting
something as this:

CTest1Dlg *dlg=(CTest1Dlg*) AfxGetApp()->GetMainWnd();
dlg->m_chat.AppendText(chatmsg);


That is a clear violation of MFC rules. Do not access the GUI from a
secondary thread.

Have you tried your code in a debug build? MFC normally will assert when
you violate this fundamental MFC rule. For the proper workaround see FAQ
11 & 12 here: http://vcfaq.mvps.org/mfc/index.htm

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