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USB Interface Adapter with native C or C++

Hi everyone:
                              I have a requirement is controlling "USB Interface Adapter" by C or C++, I knew Ti have API which is written based on .net framework for the product. Like following link:  and

But they are managed code, I can't work with them in my native C project.Actually I want to implement it on "QT", "QT" is library which is composed by native C++.I also tried methods from Microsoft advised: But some error messages occur when I tried.  

Does anyone have any suggestion for me?? Thanks in advance.