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Asked: 2026-05-26T10:25:19+00:00

I’m trying to use a native C++ dll in C# and am getting the

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I’m trying to use a native C++ dll in C# and am getting the “External component has thrown an exception” with an error code of -2147467259.

C#:

[DllImport(@"MyDLL.dll", CharSet = CharSet.Auto)]
public static extern string MyFunction([MarshalAs(UnmanagedType.LPStr)] StringBuilder input);

C++:

__declspec(dllexport) char * __stdcall MyFunction(const char* inputPtr);

The function works just fine in C++. How can I track this error down?
I have tried using string and string builder for the parameter.

Update

I found this article http://tom-shelton.net/index.php/2008/12/11/creating-a-managed-wrapper-for-a-lib-file/

It details a way to use managed C++ to wrap an unmanaged static library in C++ which can then be used in a managed language. Would this be a good way of going about tackling this problem? Can the lib be an unmanaged dll?

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1 Answer

  1. Editorial Team

    try the technique from http://blog.rednael.com/2008/08/29/MarshallingUsingNativeDLLsInNET.aspx – this has saved the day several times 🙂

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