Casting Objects from COM

Question

I am having a problem trying to cast an object to an Array.  I am trying to extract data from a log file and am using a library that came with another application.  There is no documentation so I am trying to figure out how to extract the data.  I have got it to the point where I can create an object using their library file and I can trace through using the debug I can see the data.  I am just having a problem trying to cast it into a string array to use.  I am not sure of the original data type because I do not have the documentation.  I have tried to cast it in a few different ways with no success.
Any help is appreciated, thanks
Peter