[Swig-user] Typemaps: Explanation of ctype, imtype, cstype

[Steven H. <ste...@di...>]

Hi,

I'm new to SWIG and am trying to understand how to marshal objects between C++ and C#.

Reading the SWIG 3.0 documentation I can't find any information that explains what ctype, imtype and cstype mean. They are used in the documentation on the assumption that I should know what it means. Am I missing something?

All I want to be able to do is take an object and pass it to C# as an out object. So for example, if I have the method:

C++: bool ParseMyObject( cont std::string& s, MyObject& obj );
C#: bool ParseMyObject( string s, out MyObject obj );

The above will work if I replace MyObject with a primitive type such as int. But if it's a class I created then it becomes SWIGTYPE_MyObject, which is not what I want.

If I create a method like this:
C++: MyObject GetMyObject();
C#: MyObject GetMyObject();

Then that works fine. But the ParseMyObject method still uses the SWIGTYPE_MyObject type.

I have tried to understand the typemap documentation but it is unclear and hard to follow because it refers to things like imtype that I don't recognise.

Can someone explain to me how to achieve the correct method signature for ParseMyObject in C#? This seems like it should be a simple and common thing to do. Is there a macro that will allow me to do it without having to write complicated typemaps?

Thanks,
Steven


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