p/invoke and wrapper method for RoGetMetaDataFile

gistfile1.cs

//note, this wrapper funtion returns the metadata file name and token
//it immediately releases the importer pointer
static Tuple<string, UInt32> ResolveTypeName(string typename)
{
    string path;
    object importer = null;
    UInt32 token;

    try
    {
        var hr = RoGetMetaDataFile(typename, IntPtr.Zero, out path, out importer, out token);

        //TODO: check HR for error

        return Tuple.Create(path, token);
    }
    finally
    {
        Marshal.ReleaseComObject(importer);
    }
}

[DllImport("WinTypes.dll")]
static extern UInt32 RoGetMetaDataFile(
    [MarshalAs(UnmanagedType.HString)] string name,
    IntPtr metaDataDispenser,
    [MarshalAs(UnmanagedType.HString)] out string metaDataFilePath,
    [MarshalAs(UnmanagedType.Interface)] out object metaDataImport,
    out UInt32 typeDefToken);