Issues using TCPSocket on web page

Targets Web
1

I am converting a desktop app to a web app. Both programs communicate through TCP sockets with a third (host) program that uses a Serversocket. There are no problems with the desktop app, but I have two issues with the web app. Since I cannot add a TCPSocket to the webpage as I did on the desktop app, I subclassed TCPSocket and put my code in the DataReceived event.

  1. I have been unable to get the value obtained with ReadAll to appear on the web page. The autocomplete works when I enter myPage.myContainer.myTextFld.Text but I get a nil object exception when the code runs. The same thing happened when I tried Session.myPage.myContainer.myTextFld.Text. Autocomplete did not work when I entered just the text field. I am at a loss as to how to reference objects on a webpage from a TCPSocket.

  2. On the desktop app, after I connect to the host program, soc.IsConnected returns True. On the web app, it returns False. That threw me for a while until I discovered that it was sending the request and the host was responding despite not being connected.

2

The problem you are running into is that sockets run on the main thread and have no connection to any particular session. There are a couple of ways you can handle this:

  1. When you create the tcpsocket, store a property with the id of the current session on it and later use WebSessionContext to reconnect to the session.

  2. Have the socket write it’s results into a property and then use a WebTimer to retrieve the data.

3

Thanks Greg. Should I file a bug report about the IsConnected always returns false?