Question

This is what is in the header file.

/// Creates a new file geodatabase in the specified location.
/// @param[in]    path The location where the geodatabase should be created.
/// @param[out]   geodatabase A reference to the newly-created geodatabase.
/// @return       A long integer indicating whether the method finished successfully.
EXT_FILEGDB_API long CreateGeodatabase(const std::wstring& path, Geodatabase& geodatabase);

This is what my dllimport looks like.

[DllImport("FileGDBAPI.dll", EntryPoint = "#49", SetLastError=true, CallingConvention=CallingConvention.Winapi)]
        public static extern int CreateGeodatabase([MarshalAs(UnmanagedType.LPStr)]string path, ref IntPtr geodatabase);

..and this is the code thats using it.

IntPtr Geodatabase = IntPtr.Zero;
                FileGDBAPI_wrapper.CreateGeodatabase("c:\temp\testGDB.gdb", ref Geodatabase);

What am I doing wrong?

Answer 1

I see two possible problems:

1. The C++ code is using a wide string, the C# code an ANSI string
2. The C++ code is using the std::wstring class, and not a c style null terminated string

I don’t think you can fix the second problem easily without changing the API on the C++ side