SdlEnumerateDirectoryCallback typedef
        SdlEnumerateDirectoryCallback =
     Int32 Function(Pointer<NativeType>  userdata, Pointer<Utf8>  dirname, Pointer<Utf8>  fname)
    
    
    
Implementation
typedef SdlEnumerateDirectoryCallback =
    Int32 Function(
      Pointer<NativeType> userdata,
      Pointer<Utf8> dirname,
      Pointer<Utf8> fname,
    );