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Sending data with CFSocket
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Sending data with CFSocket

  • Subject: Sending data with CFSocket
  • From: Ryan M Joseph <email@hidden>
  • Date: Fri, 21 Jan 2005 12:23:47 -0700
I am working a simple client/server application using CFSocket (for my first time) and ran into some problems when attempting sending data. I am not very experienced with sockets but I think I setup the the design as CFSocket intended. The program gets quite far before the problem so I will omit some details.

• First I setup CFSocketCreate (using AF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketDataCallBack) for the server.
• Bind the local address (AF_INET family with the IP 127.0.0.1) using CFSocketSetAddress
• Last call CFSocketCreateRunLoopSource and add the source the current loop using CFRunLoopAddSource.
• This all works without error and CFSocketIsValid returns TRUE.

• I go on to setup the client socket using CFSocketCreate with the same parameters but with a kCFSocketConnectCallBack.
• Connect to the servers address using CFSocketConnectToAddress with a negative timeout value.
• Add the client socket runloop source like mentioned above.
• Again, no errors and the kCFSocketConnectCallBack returns the connected event without an error in the data parameter.

So it appears I have a properly connected socket? I then call CFSocketSendData with the client socket (no address parameter because the socket is connected to the address and with a FSSpec stored in CFDataRef) but it just crashes inside CFSocketSendData. Other strange bug is that the server socket returns a kCFSocketDataCallBack with an empty CFDataRef (not nil) before CFSocketSendData is ever called.

If you have experience with the API any help in telling me what I did wrong would be of great help. Or maybe I should just use CFStream to send/receive data? I read in a few places that this was the preferred method although I did not see an advantage. Thank you very much for your help.
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