CSocket and CSocketFile

Posted on 2000-03-07
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();
CWinThread *def = AfxBeginThread(ClientHandler,clientsocket,THREAD_PRIORITY_BELOW_NORMAL,CREATE_SUSPENDED);
and "ClientHandler" is as under
UINT ClientHandler(LPVOID pParam)

CString test = " hello server here";
      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 ?
Question by:daknight2000
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2

Author Comment

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

Accepted Solution

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)

CSocket tempSocket;





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




Author Comment

ID: 2607522
sorry i was busy i got late

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Expand data scrubbing tool 13 36
Whole sheet autoscrub still needed 19 54
Tab names are off by one 5 54
string initialization in java 11 122
Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
Introduction: Dialogs (2) modeless dialog and a worker thread.  Handling data shared between threads.  Recursive functions. Continuing from the tenth article about sudoku.   Last article we worked with a modal dialog to help maintain informat…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question