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How to treat COM references with methods that use ref sbyte in C#

I have the following IDL definition for a method in my native ATL COM project:

[id(1)] HRESULT Create([in] CHAR* a, [out] Details* b);

I have added a reference to my COM object from my C# project and it has generated the stub for this function for me, which I need to call:

void Create(ref sbyte a, out SampleNativeLib.Details b)

I would have expected the library to let me use a string as the ref sbyte a parameter on this function.

How can I call the Create method it has generated? Are there any alternatives to have it accept the ref sbyte a parameter as a string instead?

Solution

  • You'll need to add the string attribute. This ensures that the CHAR pointer is treated as a string:

    [id(1)] HRESULT Create([in, string] CHAR* a, [out] Details* b);