Cannot communicate successfully with USB HID device using writefile()

Question

I am fairly new to C# as well as windows programming and I am attempting to establish communication between a USB HID device and an app written in c# on a windows xp pc. I have

Answer 1

Remove the ref in your WriteFile declaration.

While http://www.pinvoke.net/ is a great resource for P/Invoke declarations, it's a wiki-style website and many declarations are wrong (often they won't work on a x64 machine).