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A lot o functions in OpenNI return like this:
XN_C_API XnInt32 XN_C_DECL xnVersionCompare (const XnVersion *pVersion1, const XnVersion *pVersion2)
I’d like to now what is XN_C_API and XN_C_DECL.
Just curiosity!
It’s not anything to do with the return value. Without looking at the source, I suspect that when compiling for Windows:
XN_C_APIgets defined to either__declspec(dllexport)or__declspec(dllimport)depending on whether you’re compiling the DLL or importing functions from it.XN_C_DECLgets defined to the desired calling convention for the function (probably__stdcallor__cdecl)