Libpurple can't connect - purple_presence_is_online failed

Question

I am writing myself a small jabber client. I have used code from Libpurple.com and on Linux (Mint) everything works fine. With libraries linked program compiles with no errors and receives messages.

But when I use the same code on Windows 7, link all neccessary libraries and with Cygwin installed and PATH set, program compiles with no errors, but then NetBeans (IDE I use in Windows and Linux) says 'RUN FAILED'

When I run program from windows command line it says:

libpurple initialized. Running version 2.10.7.
** <myclient.exe:6500>: CRITICAL **: purple_presence_is_online: assertion 'presence != NULL' failed

and then it freeze. I already tried going back to libpurple 2.10.3 (the version I have in Linux) but still the same. Turning firewall off did'n help either.

Answer 1

Few things to note:

1. Each OS has its own issues when a program is deployed. So, ignore the fact that your client is working in Linux. Start with the fact, that your program / libpurple didn't work in Windows.

2. Try to see if there is a client ( pidgin etc ) which uses the same code path ( the function where the assertion fails ), and succeeds. This is to do basic sanity check that the libpurple code is in fact usable in that environment ( Cygwin )

3. If there is any traffic between your client and the server, try getting a wireshark traffic dump, and compare it between working ( Linux ) and failing ( Cygwin ) environment.