assertion fail

The following code when built (0 error, 0 warning) gives a message:
Debug Assertion failed! program C:\...\..exe, file: afxwin1.inl line:19

#include "stdafx.h"
#include <afxsock.h>
#include <afxwin.h>

in WinMain:
{
      CString serverName="mail.earthlink.net";
      UINT nPort=25;
       CSocket socket;
      AfxSocketInit();

      if(!socket.Create())return 1;
      if(!socket.Connect(serverName, nPort))return 1;
      return 0;
}

If I comment out the "create()" line, I don't get that message..

What's the problem?
samliamAsked:
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AlexFMConnect With a Mentor Commented:
Since you are using the MFC CSocket class, you should initialize MFC properly. You can learn this creating the console application with MFC support using Application Wizard.
Make the following changes:

#include "stdafx.h"
#include <afxsock.h>
#include <afxwin.h>

CWinApp theApp;       // add this line


int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    // Add these lines to WinMain start
    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    {
        return 1;
    }


    CString serverName="mail.earthlink.net";
    UINT nPort=25;
     CSocket socket;
    AfxSocketInit();

    if(!socket.Create())return 1;
    if(!socket.Connect(serverName, nPort))return 1;
    return 0;
}
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