File sending problem in chat server

[click2ranjan]

Hi friend i am new in network programming and trying to develop a chat messenger. for this most of the portion has completed but still i have some problem with file sending to anothe user,
files like .zip,.jpeg ,though the file is transfer through socket and well accepted by the user ,but i cant understand where is the mistake i have done , only text file i can transfer to another user,or it also readable ,even word file i cant read.
if any one have the solution of this problem please help me....


Thank you in advance...
Ranjan

[Frinavale]

Hi friend i am new in network programming and trying to develop a chat messenger. for this most of the portion has completed but still i have some problem with file sending to anothe user,
files like .zip,.jpeg ,though the file is transfer through socket and well accepted by the user ,but i cant understand where is the mistake i have done , only text file i can transfer to another user,or it also readable ,even word file i cant read.
if any one have the solution of this problem please help me....


Thank you in advance...
Ranjan

Are you getting any errors?

Could you please post your code that you're using to transfer the files so that we can see what your doing?

-Frinny

[click2ranjan]

added

 tags

[QUOTE=Frinavale]Are you getting any errors?

Could you please post your code that you're using to transfer the files so that we can see what your doing?

-Frinny[/QUOTE]

yes,I am getting error "file is not in correct format",file is transfered correctly but the file recieved by the user shows "file is not in correct format"

here is the code from client side 
[code=cpp]
///File to byte 
 FILE = System.IO.Path.GetFileName(filename);
            StaticData.filedata = null;
               
                System.IO.FileStream fs = new System.IO.FileStream(filename, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                StaticData.filedata = new Byte[fs.Length];
                fs.Read(StaticData.filedata, 0, StaticData.filedata.Length);
                fs.Close();

//clientside File sending code
private void SendMsg(string text)
        {
            Filesend = false;
            if (StaticData.filedata != null)
            {
                if (StaticData.filedata.Length > 10 && StaticData.filedata.Length <= 25000000)
                {

                    Filesend = true;
                }
                else
                {
                    MessageBox.Show("Selected File is too large to send ");
                    Filesend = false;
                }
            }
            string encryp = SSTCryptographer.Encrypt(text, SetKey());
            //string decryp = SSTCryptographer.Decrypt(encryp, SetKey());
            byte[] concatestr;
            try
            {
               
                if (m_clientSocket.Connected)
                {

                    byte[] stringtobyte = System.Text.Encoding.ASCII.GetBytes(encryp);
                    byte[] tmprt = System.Text.Encoding.ASCII.GetBytes("CHARLEE");


                    if (Filesend)
                        {
                            concatestr = new byte[stringtobyte.Length + StaticData.filedata.Length+ tmprt.Length];                           
                            System.Buffer.BlockCopy(stringtobyte, 0, concatestr, 0, stringtobyte.Length);
                            int vbdat = stringtobyte.Length + StaticData.filedata.Length;
                            System.Buffer.BlockCopy(StaticData.filedata, 0, concatestr, stringtobyte.Length, StaticData.filedata.Length);
                            System.Buffer.BlockCopy(tmprt, 0, concatestr, vbdat, tmprt.Length);
                            //System.Buffer.BlockCopy(StaticData.filedata, 0, concatestr, 0, StaticData.filedata.Length);
                            m_clientSocket.BeginSend(concatestr, 0, concatestr.Length, SocketFlags.None, SendCallBack, null);

                        }
                        else
                        {
                            concatestr = new byte[stringtobyte.Length];
                            System.Buffer.BlockCopy(stringtobyte, 0, concatestr, 0, stringtobyte.Length);
                            //System.Buffer.BlockCopy(StaticData.filedata, 0, concatestr, 0, StaticData.filedata.Length);
                            m_clientSocket.BeginSend(concatestr, 0, concatestr.Length, SocketFlags.None, SendCallBack, null);

                        }
                    
                   

                   
                    string msg = text;
                    Filesend = false;
                    //concatestr = ;
                    //m_clientSocket.BeginSend(concatestr, 0, concatestr.Length, SocketFlags.None, SendCallBack, null);
                    //StaticData.filedata = null;
                    // New code to send strings
                    //NetworkStream networkStream = new NetworkStream(m_clientSocket);
                    //System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(networkStream);
                    //streamWriter.WriteLine(stringtobyte);
                    //streamWriter.Flush();
                }
              
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }

        }


//client side file recieving code

 int ptr1=szData.IndexOf('@',0);                   
                    StaticData.Formrecieve = true;
                    StaticData.FormAccept = true;
                    //extract mailto name
                    //rest
                    string[] filestring = szData.Split('|');
                   // StaticData.filesize = 0;
                    //int up = theSockId.dataBuffer.GetUpperBound(0);
                    //StaticData.Formrecieve = Convert.ToBoolean(filestring[2]);
                    StaticData.FileName = filestring[1];
                    Int32 filelength = Convert.ToInt32(filestring[2]);
                    //StaticData.filesize = Convert.ToInt32(filestring[3]);
                   
                    string strndata = filestring[0];
                    filestring = strndata.Split('*');
                    strndata = filestring[1];
                    filestring = strndata.Split('^');
                    strndata = filestring[0];
                    filestring = strndata.Split(';');
                    StaticData.recieve_user = filestring[1];
                    StaticData.send_user = filestring[0];
                    Byte[] dataBuffer1234 = new Byte[filelength];
                    System.Buffer.BlockCopy(theSockId.dataBuffer, ptr1+1, dataBuffer1234, 0, filelength);
                    //System.Buffer.BlockCopy(StaticData.filedata, 0, concatestr, stringtobyte.Length, StaticData.filedata.Length);
                    StaticData.filedata = new Byte[filelength];
                    System.Buffer.BlockCopy(dataBuffer1234, 0, StaticData.filedata, 0, dataBuffer1234.Length);
                    FileAcceptance = true;
//File saving

 file.Write(StaticData.filedata, 0, StaticData.filedata.Length);
                file.Flush();
                file.Close();

[Plater]

Converting the bytes for the file to a string (for encryption?) will cause the file to become scrambled. Certain bytes will be stripped away in the process.
If you wish to send binary files, you will need to keep them as byte[] and not do any string conversion on them.

If you want an example of this, try using an FTP program and send a picture file in "text" mode and not "binary" mode and watch what happens.