Mixing Native and Managed Types in C++ Kenny Kerr — Volkswagen Pointer I

8 Апр 2015 | Author: | Комментарии к записи Mixing Native and Managed Types in C++ Kenny Kerr — Volkswagen Pointer I отключены
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Mixing and Managed Types in C++

Wow, its into a busy month. I haven’t had any time to blog having a number of interesting to cover. I’ll try to get a few of them soon. Here’s a topic one of my regular readers.

The CLR naturally mixing managed and native calls allowing you to easily native functions from functions (which are of course compiled before execution) and versa. This is all largely in C++. What’s not as transparent is how to mix and native types . The reason is there is a greater distinction native and managed types with function calls. obvious differences such as introduced by different calling and virtual invocation, function aren’t all that different. however require a bit more from the programmer/compiler since and managed types can have

different characteristics. This is evident in C# as you often need to native type definitions all kinds of attributes to control layout and marshalling. Fortunately for the C++ the compiler takes care of of this when you define or native type definitions as those found in the various header files, but the programmer is responsible for telling the compiler how those types are to be used.


Visual C++ provides many of the blocks for mixing native and types but in some cases you to write a little code to it along. Fortunately C++/CLI is capable. Let’s consider a few scenarios.

Embed Simple Type in Native Type

the CLR needs to keep track of single instance of a managed in a process, storing some of reference/pointer/handle to a managed object in a type is not directly supported instances of native types can be in any region of memory and cast to all of foreign data types would be completely opaque to the CLR and its Instead you need to register occurrences with the CLR so that it is of these “native” references to types. This is achieved the use of the GCHandle type. Internally manages a static table of pointers that are used to the objects in the managed heap. Of

course using GCHandle from C++ can be quite tedious. a CLS compliant value type means native pointers are by IntPtr values. It also not preserve static type so static_cast s are inevitable. Fortunately C++ ships with the gcroot template class that a strongly-typed interface over the type.

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#include

ref struct ManagedType

HelloDotNet()

Console::WriteLine(Hello .NET);

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