Your program doesn't crash, it hangs. It hangs because ReadToEnd() waits for an EOF which doesn't get sent by the server until the connection is closed.
Question
I try to create simple mail client. Now I can receive list of messages from mail box:
// create an instance of TcpClient
TcpClient tcpclient = new TcpClient();
// HOST NAME POP SERVER and gmail uses port number 995 for POP
tcpclient.Connect("pop.gmail.com", 995);
// This is Secure Stream // opened the connection between client and POP Server
System.Net.Security.SslStream sslstream = new SslStream(tcpclient.GetStream());
// authenticate as client
sslstream.AuthenticateAsClient("pop.gmail.com");
//bool flag = sslstream.IsAuthenticated; // check flag
// Asssigned the writer to stream
StreamWriter sw = new StreamWriter(sslstream);
// Assigned reader to stream
StreamReader reader = new StreamReader(sslstream);
// refer POP rfc command, there very few around 6-9 command
sw.Write("USER my_login@gmail.com\r\n");
// sent to server
sw.Flush();
sw.Write("PASS my_pass\r\n");
sw.Flush();
// this will retrive your first email
sw.Write("LIST\r\n");
sw.Flush();
// close the connection
sw.WriteLine("QUIT\r\n");
sw.Flush();
richTextBox2.Text = reader.ReadToEnd();
sw.Close();
reader.Close();
tcpclient.Close();
I don't uderstand why it is possible to read from stream only after sending command QUIT
? If I try to read stream to end or all lines from stream before sending message QUIT
my program crashes. Can anyone help me?
Thank you very much!
Solution
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