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.NET Forum / Languages / Managed C++ / September 2007String^
I need to expose a String property, so I have: property String^ Filename; in my ref class. Now, in a member function, I need to call a native function that takes a std::wstring parameter. Of course, the compiler is complaining of me trying to convert String^ to std::wstring. What is the solution? >.... Now, in a member function, I need to call a native >function that takes a std::wstring parameter. Of course, the compiler >is complaining of me trying to convert String^ to std::wstring. > >What is the solution? I use a function like this: static void SystemStringToStdString(String ^ SystemString, wstring & StdString) { IntPtr ip = Marshal::StringToHGlobalUni( SystemString ); const wchar_t * ps = static_cast<const wchar_t *>(ip.ToPointer()); StdString = ps; Marshal::FreeHGlobal( ip ); } There are some built-in conversions facilities in VS2008 but when I tried them they were less efficient that the above method. Dave Hello David! >> .... Now, in a member function, I need to call a native >> function that takes a std::wstring parameter. Of course, the compiler >> is complaining of me trying to convert String^ to std::wstring. > static void SystemStringToStdString(String ^ SystemString, wstring & > StdString) [quoted text clipped - 5 lines] > Marshal::FreeHGlobal( ip ); > } This solution is "overkill"... Please use simply "PtrToStringChars"... this is the fastest method...  SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ >This solution is "overkill"... > >Please use simply "PtrToStringChars"... this is the fastest method... True - and I knew it too having posed the same question elsewhere. I'm getting a short memory these days :( Dave Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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