I've found that you have two choices: 1. If you have source to the library you're interop'ing to, you can make the C interface take a "unsigned short*" instead of "wchar_t*" and it will work using the managed CharSet.Unicode for both systems. Of course your C code will have cast the paramter to a wchar_t* on windows but use a conversion function between UTF-16 and UCS-4 or UTF-8 on the non-windows library.
2. You can use C#'s custom marshal code to marshal as 2 bytes wide on windows and 4 bytes wide elsewhere and leave your C code using wchar_t everywhere. See the interfaces of System.Runtime.InteropServices.ICustomMarshaler and the attribute "[MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(YourClassDerivedFromICustomMarshaler))]". If you need an example of this let me know but the MSDN documentation using these classes should be enough for you to follow. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of ptr2009 Sent: Wednesday, June 03, 2009 11:54 AM To: [email protected] Subject: [Mono-list] What is Correct way to marshal wchar_t ? hey all I am trying to marshal strings from managed code to native code using DllImport. Marshalling both wchar_t* and char* works under mono on a windows box. But on mac os x wchart_t marshalling does not seem to work. The wchar_t* is all junk. I have tried to search this forum and people have talked about it and it seems to have been fixed. Am I missing something ? I have experimented with CharSet.Unicode on DllImport and it still doesnt work ? What is the recommended way ? Thanks Raj My cs files is something like this ____________________________________________ [DllImport("Test.dll", EntryPoint = "Global_PrintStringW")] public static extern void Global_PrintStringW( [MarshalAs(UnmanagedType.LPWStr)]string arg1); [DllImport("Test.dll", EntryPoint = "Global_PrintStringA")] public static extern void Global_PrintStringA(string arg1); private static void StringMarshallingTest() { string newString = "This is a cool string"; Console.WriteLine("Global_PrintStringA Test "); Global_PrintStringA(newString); Console.WriteLine("Global_PrintStringW Test "); Global_PrintStringW(newString); } My cpp file is something like this ________________________________ extern "C" { EXPORT_API void Global_PrintStringW(const wchar_t * str) { std::wcout << "Global_PrintStringW called with " << str << std::endl; } EXPORT_API void Global_PrintStringA(const char* str) { std::wcout << "Global_PrintStringA called with " << str << std::endl; } } -- View this message in context: http://www.nabble.com/What-is-Correct-way-to-marshal-wchar_t---tp23855173p23855173.html Sent from the Mono - General mailing list archive at Nabble.com. _______________________________________________ Mono-list maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-list _______________________________________________ Mono-list maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-list
