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So i work in clr, creating .net dll in visual c++. I tru such code: static bool InitFile(System::String^ fileName, System::String^ container) { return enc.InitFile(std::string(fileName), std::string(container)); } having encoder that normaly resives std::string. but here the compiler (visual studio) gives me C2664 error if I strip out arguments from std::string and C2440 which is in general the same. VS tells me that it just can not to convert System::String^ into std::string. So I am sad... what shall I do to turn System::String^ into std::string? Update: Now with your help I have such code #include <msclr\marshal.h> #include <stdlib.h> #include <string.h> using namespace msclr::interop; namespace NSSTW { public ref class CFEW { public: CFEW() {} static System::String^ echo(System::String^ stringToReturn) { return stringToReturn; } static bool InitFile(System::String^ fileName, System::String^ container) { std::string sys_fileName = marshal_as<std::string>(fileName);; std::string sys_container = marshal_as<std::string>(container);; return enc.InitFile(sys_fileName, sys_container); } ... but when I try to compile it gives me C4996 error C4996: 'msclr::interop::error_reporting_helper<_To_Type,_From_Type>::marshal_as': This conversion is not supported by the library or the header file needed for this conversion is not included. Please refer to the documentation on 'How to: Extend the Marshaling Library' for adding your own marshaling method. what to do?

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