Call to C Library from COM

[glassonion]

Hi all,

I'm writing an ATL COM wrapper object for a 3rd party library. The library is implemented in a suite of "C" dll's. I can successfully call the dll functions from a MFC project or a WIN32 console project but when I try and call them from within my ATL COM object I get error codes returned from the dll.

Any ideas?

Is it anything to do with the calling convention used/marshalling in COM objects to non-COM functions?

Any help would be greatly appreciated.

Mark

 

[Temps]

There's no difference in the way you call a 'C' DLL from ATL COM as opposed to MFC or WIN32 console. The only thing you need to worry about is whether the 'C' DLL is thread-safe and protect the entry point if necessary depending on which COM model you're using.

What error codes are you getting?