Hi
if you want to do testing in Visual Studio you should first of all get CPPUnit: http://sourceforge.net/projects/cppunit
I use data driven tests since years. It's simple. Once you have set up the CPPUnit test environment just set up a module which reads csv files converts the strings into integers or floats and feed in the test data. To use xls is not recommended. You would need to struggle with the format. It is easy to save any xls as csv file and use this one instead.
Joe