Marshal

https://msdn.microsoft.com/en-us/library/aa288468(v=vs.71).aspx

http://tomosoft.jp/design/?p=4647

http://stackoverflow.com/questions/24864233/marshal-structuretoptr-without-boxing

http://www.codeproject.com/Articles/66244/Marshaling-with-C-Chapter-Marshaling-Simple-Type