XSL Transform Code Generator for Visual Studio .NET

namespace CustomToolGenerator 
{
  using System;
  using System.Runtime.InteropServices;   

  [
  ComImport, 
  Guid( "3634494C-492F-4F91-8009-4541234E4E99" ), 
  InterfaceTypeAttribute( ComInterfaceType.InterfaceIsIUnknown )
  ]
  public interface IVsSingleFileGenerator 
  {
    //
    // Retrieve default properties for the generator
    // [propget]   HRESULT DefaultExtension( [out,retval] BSTR* pbstrDefaultExtension );
    //
    [return: MarshalAs( UnmanagedType.BStr )]
    string GetDefaultExtension();

    //
    // Generate the file
    // HRESULT Generate( [in] LPCOLESTR wszInputFilePath,
    // 					[in] BSTR bstrInputFileContents,
    // 					[in] LPCOLESTR wszDefaultNamespace, 
    // 					[out] BYTE**    rgbOutputFileContents,
    // 					[out] ULONG*    pcbOutput,
    // 					[in] IVsGeneratorProgress* pGenerateProgress );
    //
    void Generate(
      [MarshalAs( UnmanagedType.LPWStr )] string wszInputFilePath,
      [MarshalAs( UnmanagedType.BStr )] string bstrInputFileContents,
      [MarshalAs( UnmanagedType.LPWStr )] string wszDefaultNamespace, 
      out IntPtr rgbOutputFileContents,
      [MarshalAs( UnmanagedType.U4 )] out int pcbOutput,
      IVsGeneratorProgress pGenerateProgress );
  }
}