DEVELOPING CUSTOM SERVERS in Visual Studio .NET

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Try changing the name of the server or setting an invalid version to get one of the error codes. There is no speci c command to unload a custom server. It should be unloaded when the connection is broken, that is, when you destroy the stream used to communicate with it. It will certainly be unloaded when the connection between the PC and the phone is broken. If you use a lot of resources in your custom server and you want to ensure that they are freed up, you should add a command to your own protocol to free them rather than rely on unloading the custom server.
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7.8 Communicating with a Custom Server
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Once we have the custom server loaded, we can communicate with it. We will see in later chapters, in particular s 10 to 13, that one of the major aspects of Connectivity programming at the lower level is concerned with putting data into packets to send to the phone and extracting data from packets received from the phone. We will develop some simple routines both on the PC and on the phone to handle the packing and unpacking, but this chapter will include only a minimum of data handling and I will concentrate on showing the other aspects of the communication. As the echocs custom server just echoes data, we will simply allow the user to enter any text desired, send it to the custom server and then read it back. To write the data to the phone, we receive text from the console, we write the length of the data, and then we write the data (remember that earlier I explained the protocol with the data length followed by the data).
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// Write 32-bit integer LSB first public void WriteInt32( int aValue, ref { aBuffer[aStartPos] = (byte) (aValue aBuffer[aStartPos+1] = (byte)((aValue aBuffer[aStartPos+2] = (byte)((aValue aBuffer[aStartPos+3] = (byte)((aValue }
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byte[] aBuffer, int aStartPos ) & & & & 0x000000ff); 0x0000ff00)>>8); 0x00ff0000)>>16); 0xff000000)>>24);
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... // establish connection to echocs ... System.Console.WriteLine("Enter text to be echoed"); string text = System.Console.ReadLine(); // Write message length int textLen = text.Length; message = new byte[4]; WriteInt32(textLen, ref message, 0); myStream.Write(message); // Write the data
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ASYNCHRONOUS COMMUNICATION
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message = new byte[textLen]; for(int i = 0 ; i < textLen ; i++) {message[i] = (byte)text[i];} myStream.Write(message);
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As you can see, the Write() method in C# uses the fact that the boxed arrays know how long they are. Please note that the message is not sent (at least it is not received by the custom server) until it is complete, based on the four-byte length. This means that you can write the message in a number of sections, as above, or put together a single buffer and send that. To read the data, we use the Read() method. We start by reading the four-byte message length and then we read the actual data. If your protocol is such that your packets are supposed to be of a xed size then you might think that you could read the whole message in one operation, but I suggest that you stick with reading it in two stages.
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retval = myStream.Read(message);(4, out oResponse); int msgLen = 0; if(retval == 4) { byte[] buff = (byte[])oResponse; msgLen = ReadInt32(ref buff, 0); System.Console.WriteLine("Message length is {0}", msgLen); } else { System.Console.WriteLine("Failed to read message length"); } if(msgLen > 0) { retval = myStream.Read(msgLen, out oResponse); if(retval == msgLen) { byte[] buff = (byte[])oResponse; for(int i = 0 ; i < msgLen ; i++) {System.Console.WriteLine("byte {0} = {1}", i, buff[i]);} } else { System.Console.WriteLine("Tried to read {0} but only read {1}", msgLen, retval); } }
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7.9 Asynchronous Communication
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In this example, we have a very simple control ow: we carry out a synchronous read directly after the synchronous write operation. This will work if the custom server responds promptly and there are not too
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