Extend SMS Messaging to the Desktop Using Windows : Page 2

Creating the SMS Sender Windows Mobile Application
First, you'll create the Windows Mobile application that sends the messages. Using Visual Studio 2008, create a new Smart Device project (select the Windows Mobile Professional template and the .NET CF 3.5) and name it SMSSender.

SMSSender application does not really need a user interface; hence you don't need to populate the default Form1 with any controls.

Add a reference to the following DLLs:

• Microsoft.WindowsMobile.PocketOutlook
• Microsoft.WindowsMobile.Status

Switch to the code-behind of Form1 and import the following namespaces:

using System;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Text;
using Microsoft.WindowsMobile.PocketOutlook;
Define the following constants and objects:
    public partial class Form1 : Form
    {
        const string DESKTOP_IP_ADDRESS = "169.254.2.2";
        const int portNo = 3456;
        const int DATA_SIZE = 1024;
        byte[] data = new byte[DATA_SIZE];
        Socket desktop;

To communicate with the desktop Windows application, you'll use a Socket object in the .NET Compact Framework.

Define the SendSMSMessage() function so that you can send a SMS message from within the Windows Mobile device:

private void SendSMSMessage(string message)
        {
            string[] msg = message.Split('|');
            SmsMessage sms = new SmsMessage()
            {
                Body = msg[1]
            };
            sms.To.Add(new Recipient(msg[0]));
            sms.Send();

            //---inform the desktop---
            SendMessage("Message sent!");
        }

The SendSMSMessge() function takes in a single string parameter containing the recipient phone number and the message body. These two fields are separated by a pipe character (|).

The SendMessage() function sends a message back to the desktop application through the socket connection. It is defined as follows:

        //---send data to the desktop---
        private void SendMessage(string message)
        {
            byte[] data =
              Encoding.ASCII.GetBytes(message);
            desktop.Send(data);
        }

Define the ConnectDesktop() function so that you can establish a connection with the desktop application:

private void ConnectDesktop()
        {
            //---IP address and port no. of the desktop---
            IPAddress desktop_Address =
                IPAddress.Parse(DESKTOP_IP_ADDRESS);
            IPEndPoint endPoint = new IPEndPoint(desktop_Address, portNo);

            //---connect to the desktop---
            desktop = new Socket(endPoint.AddressFamily,
               SocketType.Stream, ProtocolType.Tcp);
            desktop.Connect(endPoint);

            //---read incoming data from the desktop---
            IAsyncResult ar = desktop.BeginReceive(
               data, 0, DATA_SIZE, SocketFlags.None,
               ReceiveMessage, null);
        }

The ReceiveMessage() function listens for incoming messages from the desktop application. When a message is received, it is sent to the SendSMSMessage() function, so that a message can be sent (see Listing 1).

Finally, when Form1 loads, you can make a connection to the desktop application:

        private void Form1_Load(object sender, EventArgs e)
        {
            ConnectDesktop();
        }

That's all for the SMSSender application.

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