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p/invoke and wrapper method for RoGetMetaDataFile

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//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);
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