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8.1

Explain client-server control channel model

Asked by DrDamnit in .NET, Computer Servers, Microsoft Visual Basic.Net

I am working on a client - server model program for doing monitoring and transferring files back and forth between the server and the client(s).

I am having trouble wrapping my head around something, and need some *expert* opinions.

My idea is to send commands using XML over a control channel that tell the opposite end (whether it be server or client) what to do.

For instance, a login command from the client asking to log in would look like the first code snippet below.

My problem is, I dont' quite understand how to have a control channel that will differentiate between login, and file transfer connections.

Passing commands back and forth, it will always expect XML. That's fine, and I can handle that.

How do I tell the server (or client) to get ready to accept a binary file transfer?

What's the cleanest way? I obviously will have to connect back to the server again, but how will the server know what to expect that's different?

I appreciate any advice you can give. 
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==============LOGIN======================
<service>
<command>
<Login>
 <Username>joemsith</Username>
 <Password>supersecretpassword</Password>
 </Login>
</command>
</service>
==============FILE TRANSFER==============
<service>
     <command>
          filetransfer
     </command>
     <payload>
          <file>
               <name>giantfile.zip</name>
               <size>73468513</size>
         </file>
     </payload>
</service>
[+][-]09/19/09 08:19 PM, ID: 25375770Accepted Solution

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Zones: .NET, Computer Servers, Microsoft Visual Basic.Net
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Solution Provided By: ToddBeaulieu
Participating Experts: 1
Solution Grade: A
 
[+][-]09/19/09 08:12 PM, ID: 25375754Expert Comment

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[+][-]09/19/09 08:26 PM, ID: 25375783Expert Comment

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[+][-]09/19/09 08:58 PM, ID: 25375830Expert Comment

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[+][-]09/19/09 09:00 PM, ID: 25375831Author Comment

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