Socket Programming??

This is a discussion on Socket Programming?? within the Networking/Device Communication forums, part of the General Programming Boards category; Hi folks, I'm triying to send message form the client to the server in BCB 6.0 but when I send ...

  1. #1
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    May 2004
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    2

    Socket Programming??

    Hi folks,
    I'm triying to send message form the client to the server in BCB 6.0 but when I send the message I got immediately "Error receiving" I couldn't find where is the wrong..
    Any answer will appreciate..

    My code look like this
    --- client ---
    Code:
        bool __fastcall SendBuffer(TCustomWinSocket *Socket, void *Buffer, int 
    Length) 
        { 
            int Sent = 0; 
            int Total_Sent = 0; 
            BYTE *Buf = (LPBYTE)Buffer; 
    
            while( Total_Sent < Length ) 
            { 
                Sent = Socket->SendBuf(&Buf[Total_Sent], Length - Total_Sent); 
                if( Sent <= 0 ) 
                { 
                    if( WSAGetLastError() == WSAEWOULDBLOCK ) 
                        continue; 
                    return false; 
                } 
                Total_Sent += Sent; 
            } 
            return true; 
        } 
    
        //... 
    
        AnsiString text = Edit1->Text; 
        int length = text.Length(); 
    
        bool ok = SendBuffer(Form1->ClientSocket1->Socket, &length, 
    sizeof(int)); 
        if( ok ) 
            ok = SendBuffer(Form1->ClientSocket1->Socket, text.c_str(), length); 
        if( !ok ) 
            ShowMessage("Error"); 
    
    
        --- server --- 
    
        bool __fastcall ReadBuffer(TCustomWinSocket *Socket, void *Buffer, int 
    Length) 
        { 
            int Read = 0; 
            int Total_Read = 0; 
            BYTE *Buf = (LPBYTE)Buffer; 
    
            while( Total_Read < Length ) 
            { 
                Read = Socket->ReceiveBuf(&Buf[Total_Read], Length - 
    Total_Read); 
                if( Read <= 0 ) 
                { 
                    if( WSAGetLastError() == WSAEWOULDBLOCK ) 
                        continue; 
                    return false; 
                } 
                Total_Read += Read; 
            } 
            return true; 
        } 
    
        //... 
    
        AnsiString buffer; 
        int length = 0; 
    
        bool ok = ReadBuffer(Socket, &length, sizeof(int)); 
        if( ok ) 
        { 
            buffer.SetLength(length); 
            ok = ReadBuffer(Socket, buffer.c_str(), length); 
        } 
        if( !ok ) 
            ShowMessage("Error receiving");
    Thanks in Advance
    BigSky_(*
    Last edited by Salem; 05-08-2004 at 03:18 PM. Reason: Code tagging

  2. #2
    Carnivore ('-'v) Hunter2's Avatar
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    I might look at the code after you put it in code tags.
    [ code ] ... [/ code ] (without the spaces).
    Just Google It. √

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  3. #3
    and the hat of wrongness Salem's Avatar
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    if( WSAGetLastError() == WSAEWOULDBLOCK )
    continue;
    return false;
    Instead of just returning false, why not print out the value returned by WSAGetLastError(), so you have more information to hand

    > ok = ReadBuffer(Socket, buffer.c_str(), length)
    As far as I know, these c_str() things are supposed to be constant, so its not correct to go writing into them.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  4. #4
    Registered User
    Join Date
    May 2004
    Posts
    2
    Well,
    In fact this code works but when exactly message received after that I get

    > if( !ok )
    > ShowMessage("Error receiving");
    I couldn't understand if code works Why I am receiving this error...


    BigSky_(*

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