source code at that site seems to no longer exist or the links are dead.
I'm also trying to author a plugin, but I'm having no luck using CodeWarrior under OSX, although I have written plugins for FM/Windows.
As for trying to convert a number to string, you shouldn't need a new plugin to do that. You should just use a built in function. Judging from how FM handles data passing between your plugin and Filemaker, everything is a (char*) string.
Does anyone here