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Asked: 2026-05-15T01:16:27+00:00

I have a C++ DLL that imports a .tlb file generated in a C#

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I have a C++ DLL that imports a .tlb file generated in a C# project. The C++ DLL is a wrapper DLL containing functions that call the corresponding C# functions.

When I call the C++ functions on the computer that I built the projects, all works well. But when I copy the DLL’s and generated tlb’s to another computer with the same exact version of Windows and installed programs andI call the C++ functions, it breaks with a COM error. However, after recompiling the projects on the new computer, everything works again.

I already checked the “Work on All Computers” for both projects but this keeps happening. What else do I need to do for the DLL’s to work on all computers?

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1 Answer

  1. Editorial Team

    The HRESULT you get would be crucial to diagnose this. Forced to guess: did you run Regasm.exe on that machine? Required to make the necessary registry entries so COM can find the server. It is automatic when you build in the IDE.

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