First of all, thank you very much having a look at it. I am quite new to inline c, xs, I am still on the steep curve leraning the perl c api. As you mention the loop is completely useless, but this is on purpose. I want to return more hashes later, just 1 suffices for now. For the compilateion, it compiles fine with active state perl 5.10 with dmake (after installing minwg ppm module) as wel as with nmake (with visual studio environment). I will test out your suggestions above. Many Thanks,