<<Programming Ruby 2nd>> teaches me how to create a new Excel file and add 
something to it, but now I have a task that there were some existing Excel 
files with data, what should I do is opening the files one by one and read 
the data for doing something.
I try to use the WIN32OLE .connect() function, but it didn't work.
Is there other better way to do so?
thanks a lot!