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CSocket and CSocketFile

Posted on 2000-03-07
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Last Modified: 2013-11-20
I am trying to make  a simple client server application using CSocket and CSocketFile.
I have coded 2 thread functions, one listens for clients requests, while after moving beyond Accept()... first thread funtion "ServerStarter" is supposed to spin the other thread whoise function is "ClientHandler".
Code is as under
UINT ServerStarter(LPVOID pParam)
{CClientSocket*      clientsocket = new CClientSocket();
CListenSocket*      listensocket = new CListenSocket();
.
.
listensocket->Accept(*clientsocket);
CWinThread *def = AfxBeginThread(ClientHandler,clientsocket,THREAD_PRIORITY_BELOW_NORMAL,CREATE_SUSPENDED);
def->ResumeThread();
}
and "ClientHandler" is as under
UINT ClientHandler(LPVOID pParam)
{
((CClientSocket*)pParam)->init();

CString test = " hello server here";
*(((CClientSocket*)pParam)->in)<<test;
((CClientSocket*)pParam)->in->Flush();      
      return 0;
}

while init() is as under

void CClientSocket::init()
{

pSocketFile = new CSocketFile(this);
in = new CArchive(pSocketFile,CArchive::store);
out= new CArchive(pSocketFile,CArchive::load);

}

now programme give an "Assert_Valid" when it goes inside the init on the line
in = ........
to me, it seems that that socket is appearing an unvalid one to it. But if I dont start the thread "ClientHandler" and try to send to the data to client from first thread "ServerHandler" every things goes ok.
what could be the reason ?
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Comment
Question by:daknight2000
  • 2
3 Comments
 

Author Comment

by:daknight2000
ID: 2593942
I have also tried making "clientsocket" as a global variable  but it didnt help.
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Accepted Solution

by:
ShaunWilde earned 100 total points
ID: 2594627
You should only use CSockets etc in a CWinThread (UI thread) type thread as the CWinThread contains all the initialization required to manage CSockets.

so in your OnAccept of your listener socket you would (pseudo code)

CListenSocket::OnAccept(...)
{
CSocket tempSocket;

Accept(&tempSocket);

CSocketThread*pThread=(CSocketThread*)AfxBeginThread(RUNTIME_CLASS(CSocketThread),...,CREATE_SUSPENDED);

pThread->tempHandle=tempSocket.Detach();

pThread->ResumeThread();
}

then you would attach your socket to your thread in the initinstance
class CSocketThread:public CWinThread
{
SOCKET tempHandle;
CClientSocket m_socket; // derived from CSocket

}

CSocketThread::InitInstance()
{
m_socket.Attach(tempHandle);
m_socket.Init();
}

0
 

Author Comment

by:daknight2000
ID: 2607522
thanx..
sorry i was busy ...so i got late
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