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POHow to wrap a C++ class in a C based dll or a CLI based dll?
 

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  1. POHow to wrap a C++ class in a C based dll or a CLI based dll?
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    <p>I am told to import my writen class in C++ into a dll and then use that dll in a c# application. Following <a href="https://stackoverflow.com/questions/4555961/how-to-use-a-class-in-dll">this guide</a> I created the dll, but I can't simply use it in a C# application since there are some issues concerning it: </p> <ol> <li><p>What should I place for the return type of my factory function? </p></li> <li><p>What is the equivalent of <code>const wchar_t*</code> which is my constructors argument type?</p></li> <li><p>How can I retrieve and use my functions return type which is of type <code>vector&lt; wstring&gt;</code>?</p></li> </ol> <p>These are the problems that prevent me from using my C++ DLL inside my C# applications. I was told that I need to create a wrapper with C++/CLI and then use that inside my C#. But sadly I have no idea about it, I don't know C++.net.</p> <p>The only thing that currently seems to be a bit more sensational to me is to make it somehow compatible with C and then create a C DLL and use that in my C# application. I have read that in C, class object pointers are accessible through <code>HANDLE</code>s, so I thought that would be good idea to get things going without a lot of changes. </p> <p>So the question is how can I use Handles to access my class objects in C and use them? And how can I convert a <code>vector&lt;wstring&gt;</code> to its C counterpart? If I want to use CLI to create a wrapper (DLL?) for my C++ DLL, to be used in other dotnet apps what should I do?</p>
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    1. COThe windows `HANDLE` type are just `void *`s
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    2. CO`const wchar_t *` is an extremely vague parameter specification. Perhaps it is a UTF-16LE encoded Unicode string with a NUL terminator that is being passed into the constructor. If so, it is close to .NET's `System::String`, which is a code-unit counted UTF-16LE encoded Unicode string. (At least it has `const` so we know that it's immutable and therefore not an in-out parameter.)
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      1. POHow to wrap a C++ class in a C based dll or a CLI based dll?
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    3. CO.NET `char` marshals to `wchar_t`.
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