在SWIG接口中将C ++ _TCHAR绑定到C＃字符串

Question

I have some old C++ code that I'm trying to compile as a DLL so that it can be used in a C# Xamarin.IOS project, using SWIG to create bindings for a wrapper between the C++ and the C#.

So far I have been able to get it working for all methods that take or return int , double , or bool parameters, but I'm stuck with how to deal with _TCHAR s.

Where the C++ code uses _TCHAR s as the parameter types, no matter what I've tried in the SWIG interface file, the C# parameters for any methods which should take a string are coming up as SWIGTYPE_p__TCHAR , which is as far as I can tell is what SWIG produces when it doesn't know what it should use.

I'm sure that this should be a case of using the right typemap in the SWIG interface file, but nothing I've tried so far has worked, any suggestions would be much appreciated!

Answer 1

TCHAR is a preprocessor defined constant that is set at compile time windows.h based on the UNICODE preprocessor constant: if UNICODE is defined, it will either be wchar_t , otherwise it will be char. But you have to choose one: is your module unicode or ascii? If former, you should set UNICODE as part of your SWIG command:

swig -DUNICODE -c++ -csharp example.i

else

swig -c++ -csharp example.i

Since you are presumably doing latter, and getting this error, you probably forgot to %include <windows.i> after the preamble and before your declarations (if you have trouble, show your .i then I can be more specific).

Answer 2

最后，C ++代码的维护者将其代码更改为使用标准char而不是_TCHAR并且我设法使此工作正常。