It's in your own, first post in this thread. E.g.

#import "libid:BED7F4EA-1A96-11D2-8F08-00A0C9A6186D"
#import "libid:ecf2e77d-3a90-4fb8-b0e2-f529f0cae9c9"
#import "libid:1F165598-2F77-41C8-A9F9-EAF00C943F9F"

But, as I wrote, for reasonable coding you need ATL/MFC, and that's not available with VS Express.

My previous answer is also valid for an unmanaged DLL project type. Use the #import-s.

In an unmanaged C++ project, you do not add references to the project itself. You just use #import directives.

In a managed C++ project, right-click on it in the Visual Studio Solution Explorer, select Common Properties -> Framework and References, press "Add New Reference", and select the assemblies (which one is which is described in the Concepts doc).

The examples use ATL/MFC libraries that are not supported in the Express edition of Visual Studio 2013.

msdn.microsoft.com/en-us/library/hh967573(v=vs.120).aspx

social.msdn.microsoft.com/Forums/en-US/997194c1-2ef5-474d-9e...o-2013-express?forum=vcgeneral

I think you are out of luck in this respect, with the Express edition and our examples. While ATL/MFC is not strictly necessary (and it should be possible to write a working code without them), they are so useful that it does not make sense for us to provide examples that would not require them.

You may still be able to use managed C++ (those are under the .NET examples), or any .NET based examples such as C# (this forum topic actually should have been started under QuickOPC-COM, because the examples you are referring to are using the COM interfaces of QuickOPC).

Best regards

Can you please provide following:

1. Edition and version of Visual Studio
2. Version and build of QuickOPC (hint: it is on the first page of installation wizard).
3. A copy of the actual error message you are getting.

Thank you