need help using thread and socket

hi
i have developed a server socket program which keeps on sending message. i have created a seperate thread using afxbeginthread(SendMsg,this) (this points to the CSocket derived class). im using carchive. the problem is when the thread tries to send messaage i get a debug assertion error.
i dont know what is the cause of the problem.

UINT SendMS(LPVOID lp)
{
CServerSock* pSock=(CServerSock*)lp;
do
{
pSock->SendStatus();// here i get error

Sleep(1000);
}while(pSock->m_pDlg->m_sta);
return 1;
}


void CServerSock::SendStatus()
{
m_pDlg->Serialize(*m_pArOut);
m_pArOut->Flush();

}

when i press retry i goes to base class

void CAsyncSocket::AssertValid() const
{
CObject::AssertValid();
ASSERT(m_hSocket == INVALID_SOCKET || CAsyncSocket::FromHandle(m_hSocket) != NULL);
}


outside the thread im able to send the message. i would be happy if u can help me with this problem
regards
aswin

Code:

---

CServerSock* pSock=(CServerSock*)lp;

---

do NOT pass pointers to MFC objects across threads! NEVER!
pass the m_hWnd's of the objects instead.
see this FAQ and this thread.

Post the code the calls the API to send messages. One solution is AfxGetMainWnd().

Kuphryn

The code in the thread will be running in a different 'scope' from the MFC object you created, and therefore the pointer is invalid.