Return function value from dll c++ to c#

Asked Aug 09 '18 at 14:38

Active Aug 09 '18 at 14:38

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I have wrote dll in c++ and some function has vector type. I want returrn those value in c#. this my code: C++:

    extern "C" __declspec(dllexport)    vector< int>  convertA4(char  *filePath,  char *outPath) {}

c#:

    [DllImport("ConsoleApplication1.dll", CallingConvention = CallingConvention.StdCall)]
    public static extern List<int>  convertA4( string filePath, string outPath );

but when I run the app, this error has been showen:

Cannot marshal 'return value': Generic types cannot be marshaled.

asked Aug 09 '18 at 14:38

Ahmad headr

the memory layout of a `vector´ matches that of an array of integer, so the type should be an `int[]`, by value not by reference – Cee McSharpface Aug 09 '18 at 14:46
Can you show me in code ?? – Ahmad headr Aug 09 '18 at 15:12
see the duplicate: signature in c++ would be `int *convertA4(char *, char *)`, coming in as `int[] convertA4(string, string)` – Cee McSharpface Aug 09 '18 at 16:34

Return function value from dll c++ to c#

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