get unicode buffer bytes in c# returns '??????'

Question

I have a function that gets data from buffer and converts them to string as you can see :

public string GetParameters(byte[] buf)
{
    string result = System.Text.UnicodeEncoding.Unicode.GetString(buf);
    return result;
}

Another application sends a Farsi string to buffer and my application should get this data, but my application's function returns this:

㨲께裙듘�����¯

Why ?

How can i receive buffer data : I define this :

public byte[] dataBuffer = new byte[4000];

I have this function :

 public void WaitForData(System.Net.Sockets.Socket soc)
        {
            try
            {
                if (pfnWorkerCallBack == null)
                {
                    // Specify the call back function which is to be 
                    // invoked when there is any write activity by the 
                    // connected client
                    pfnWorkerCallBack = new AsyncCallback(OnDataReceived);
                }
                SocketPacket theSocPkt = new SocketPacket();
                theSocPkt.m_currentSocket = soc;
                // Start receiving any data written by the connected client
                // asynchronously
                soc.BeginReceive(theSocPkt.dataBuffer, 0,
                                   theSocPkt.dataBuffer.Length,
                                   SocketFlags.None,
                                   pfnWorkerCallBack,
                                   theSocPkt);
            }
            catch (Exception qqq)
            {

            }

        }

And another one :

 public void OnDataReceived(IAsyncResult asyn)
        {
            try
            {
                SocketPacket socketData = (SocketPacket)asyn.AsyncState;

                int iRx = 0;
                // Complete the BeginReceive() asynchronous call by EndReceive() method
                // which will return the number of characters written to the stream 
                // by the client
                iRx = socketData.m_currentSocket.EndReceive(asyn);
                string res = GetParameters(socketData.dataBuffer);
}

Exactly 4k bytes is a suspiciously round number. You need to decode only the part of the buffer that has the data in. — Charles Mager, Oct 12 '16 at 09:00
better to show how you get buffer to find root of the problem — M.kazem Akhgary, Oct 12 '16 at 09:14
This looks like UTF8 data : byte[] input = {50, 58, 216, 174, 217, 136, 216, 180, 32, 216, 162, 217, 133,216,175}; string output = Encoding.UTF8.GetString(input); — jdweng, Oct 12 '16 at 09:22

score 2 · Accepted Answer · edited May 23 '17 at 12:06

2

Try to use UTF-8:

string result = System.Text.UnicodeEncoding.UTF8.GetString(buf);

That looks like Farsi to me. (But I don't speak Farsi.)

The differences between Unicode and UTF-8 are mentioned here: UTF-8 vs. Unicode

Essentially the length of a character makes the difference.

edited May 23 '17 at 12:06

Community

1
1

answered Oct 12 '16 at 09:25

haindl

3,111
2
25
31

It says just خوش آمدید in farsi that it mean welcome in english :) – Ehsan Akbar Oct 12 '16 at 09:29
1

@EhsanAkbar Glad I could help you. :-) – haindl Oct 12 '16 at 09:35

score -2 · Answer 2 · answered Oct 12 '16 at 09:08

-2

string myDecodedString = Encoding.GetEncoding("1256").GetString(buf)

answered Oct 12 '16 at 09:08

raidensan

1,099
13
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{"'1256' is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.\r\nParameter name: name"} – Ehsan Akbar Oct 12 '16 at 09:11

get unicode buffer bytes in c# returns '??????'

2 Answers2