# Tuesday, 11 December 2007

At Tech Ed Developers Europe, one of my talks was on STL/CLR and the marshaling library. There are three super cool things about the marshaling library that all C++ developers need to know. The first is that the random boilerplate code we used to write to convert between two kinds of strings is now taken care of for us:

char* stringfromnativelibrary;   //gets set somehow
ManagedFunctionExpectingSystemString(marshal_as<String^> stringfromnativelibrary);

The second is that it's just templates, meaning it is fast at runtime and intuitive for a C++ developer. The third is that because it's templates, we can write our own specializations, and convert between any two types we feel we will be using - typically on either side of the managed/native border, though that's not a requirement at all.

This last part is really exciting to me. Imagine you have some library you wrote ages ago that takes a RECT and does something with it related to your business logic. But you've replaced your UI and now you have a System::Drawing::Rectangle to represent what your user selected. Wouldn't it be cool to write:

oldfunction( marshal_as<RECT> RectangleFromWinForms);

That's not a problem as long as someone has written that specialization. You can do it, or you can try to find one someone else already wrote.

Date and time, arrays, anything related to screen position, these are going to be types everyone uses. Why not share the effort of writing these conversion functions? That's the thought that hit me at the end of my talk. So I came home and set up a site -  www.marshal-as.net - to use for just this purpose. I've had a few submissions from Jason, who was at my talk and was there when I thought of it, and a wish list from a "little birdie". The C++ team knows what I'm up to and they are excited too. Now what I need is submissions and lots of them!

So, drop me an email, comment on this post, or (better) comment on the first post over at www.marshal-as.net. I'll post the specializations one per post and we'll build a library. I'm inspired by pinvoke.net and would like to see this as the destination for finding a specialization instead of writing one. Can you help?

Kate

Tuesday, 11 December 2007 07:38:37 (Eastern Standard Time, UTC-05:00)  #    Comments [0]