Question

I am building a small multipliplayer which will need the following:

it must be written in Delphi
must support Internet connection (not only LAN)
work over HTTP
support some encryption of the packets (it may be custom)
be able to send commands to the server
be able to receive responses from the server
be able to connect up to 8 players to one server
be able to pass complex objects (maybe JSON serialized) to the servers

Do you think the new Delphi 2010 Datasnap can be used successfully in this scenario or should I go with the plain old TSocket?

Answer 1

DataSnap can do all that you ve listed above:

DataSnap is written in Delphi.
It can connect via HTTP over any connection, local, network, or remote.
It will work over HTTP, including support for tunneling the HTTP connection
You can filter the data stream however you like. The product includes a compression filter. Daniele Teti has written some very nice encryption filters.
You can send commands to the server by calling server methods
You can receive a response from the server via server callbacks
You can easily connect eight people to a server
You can pass JSON objects. That is the default type sent between client and server.

So to answer your question, yes, I think that the new Delphi 2010 DataSnap can be used in your scenario.

Answer 2

As Nick said, the answer is Yes.

Bob Swart wrote a white paper and produced some videos on the updated DataSnap in Delphi 2010 that can help get you started.

Answer 3

If your multiplayer game doesn t send much data HTTP and Datasnap may work. If you need a fast communication, I d use UDP and custom binary protocol. Unless you have to bypass a company firewall that stops almost any protocol but HTTP - and companies usually don t like people playing in their working hours - a firewall blocks incoming connection, not outgoing. Just the server needs open ports to allow clients to connect. And I d avoid JSON as well - if you don t need interoperability a binary serialization is much faster.

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