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Thread: Error “Attempted to access an unnamed file past its end.” when data receive over sock

  1. #1
    Join Date
    Jun 2018
    Posts
    1

    Error “Attempted to access an unnamed file past its end.” when data receive over sock

    I have an MFC server which is listening on a port all the time. Now my requirement is to send data over the socket(using TCP/IP) to this server from a client written in python 3.6.

    The python client sends the bytes, but once I receive data at the server end, the exception is thrown "Attempted to access an unnamed file past its end."

    //Server code snippet
    Code:
    void CClientSocket::ReceiveMsg(CMsg* pMsg)
    {
        pMsg->Serialize(*m_pArchiveIn);
    }
    
    void CMsg::Serialize(CArchive& ar)
    {
        if (ar.IsStoring())
        {
            ar << (WORD)bClose;
            ar << m_strText;
        }
        else
        {
            WORD wd;
            ar >> wd;
            bClose = (BOOL)wd;
            ar >> m_strText;
        }
        m_msgList.Serialize(ar);
    }
    //Client code
    Code:
    '''
        Simple socket client
    '''
    
    import socket
    import sys
    
    def testme():
        PlayerHost = "127.0.0.1"
        PlayerPort = 501
        try:
            print ("Connecting --- to server" + PlayerHost)
            playerSoc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            playerSoc.connect((PlayerHost,PlayerPort))
        except e:
                print ("Connectiong error")
                print(e)
    
        try:
            dataSendCommand = '$Command Command 0 100';
            print ('---Before encode Command' + dataSendCommand);
            #print ('After encode command' + dataSendCommand.encode());
            nbytes  = playerSoc.send(dataSendCommand);
            print(nbytes);
            playerSoc.close();
    
        except e:
            print ("Some issue")
    
    
    testme()
    exit(0)
    I am not much aware of how to MFC sockets are working with CArchive and what exactly happens in there. Also, if I send message from C++ client, it works fine. Any help on how to send data from python to MFC C++ server which is compatible so that receive is successful is what I want know. Your help appreciated.

    I have the following in MFC C++ which I want to replicate in python but I am not sure on the datatype to be used.
    Code:
    USES_CONVERSION;
           char buf[1024];
           int nBufLen1;
    
           CString sendBuffer("$MyCommand Hi");
           //int nBufLen1 = sendBuffer.GetLength();
           buf[0] = 0;
           buf[1] = 0;
           WORD len = sendBuffer.GetLength() * 2;
           nBufLen1 = len + 5;  // length of message
    
           buf[2] = (BYTE)len;
           char *pStr = T2A(sendBuffer);
           strncpy(&buf[3],pStr,len);    // actual string to send
    
           buf[len + 3] = 0;
           buf[len + 4] = 0;
    
    
           if(sock.Send (&buf,nBufLen1) != nBufLen1)
           {
                  OutputDebugString(L"Socket Send Failed");
                  return FALSE;
           }
    Can anyone help me with the datatype ?

    Since I am new to python here is what i tried

    Code:
    bufArr2 = ["0" , "0" , "26" , "$MyCommand Hi" , "0" , "0"]
    print(bufArr2[3]);
    nbytes  = playerSoc.send(bufArr2.encode()); //Error
    I received error "descriptor 'encode' requires a 'str' object but received a 'list'"

    Not sure on how to send the list as bytes. Also, not sure if there is something else that I can use instead of list.

    Megha

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
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    Location
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    Re: Error “Attempted to access an unnamed file past its end.” when data receive over

    Victor Nijegorodov

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