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CHAPTER 13 INTEROPERABILITY
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to give you an idea of what is possible. You could write an entire book on C++ interop. For more information, you may want to consult Expert Visual C++/CLI by Marcus Heege (Apress, 2007).
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Interoperating with Other .NET Languages
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It is straightforward to use types created in another .NET Language in C++/CLI. In fact, you do this all the time, since much of the .NET Framework is written in C#. When interoperating with C# or VB or any of a number of non-Microsoft languages, you need to be aware of what features of C++/CLI are available in other languages, and what are not. For example, C# does not support global functions. If you define a global function and make it public, you cannot call it from C#. You could call such a function through a public static method of a public class. If you want a managed language that lets you do everything, IL is the answer see Expert .NET 2.0 IL Assembler by Serge Lidin (Apress, 2006) for more details. It is fair to say that IL is the language below C++/CLI on the CLR, just as assembler is the one language lower than C++ on many platforms. Using pure or safe mode makes sense for cross-language interop, since it s easy to reference MSIL assemblies from VB or C#. If you were to compile in mixed mode, you d need to create a managed wrapper to ensure that the code can be accessed from the other languages, as shown in Listings 13-1 and 13-2. Listing 13-1. Wrapping a Global Function // global_function.cpp // Compile with cl /clr:safe /LD global_function.cpp. using namespace System; namespace G { void FGlobal() { Console::WriteLine("Global C++/CLI Function."); } public ref class R { public: static void FMember() { Console::WriteLine("C++/CLI Static Member Function."); FGlobal(); } }; };
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CHAPTER 13 INTEROPERABILITY
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Listing 13-2. Consuming a Wrapped Global Function in C# // consume_cpp.cs // Compile with csc /r:global_function.dll consume_cpp.cs. using G; class C { public static void Main() { // FGlobal(); // Error: global functions not available in C#. R.FMember(); // OK } }; The output of Listing 13-2 is as follows: C++/CLI Static Member Function. Global C++/CLI Function. Listing 13-3 shows a C++/CLI interface that is then implemented in a VB class in Listing 13-4. Listing 13-3. Creating an Interface in C++ // interface_example.cpp // Compile with cl /clr:pure /LD interface_example.cpp. public interface class ITest { void F(); void G(); }; Listing 13-4. Using an Interface in Visual Basic ' implement_example.vb ' Compile with vbc /r:interface_example.dll implement_example.vb. Public Class VBClass Implements ITest Public Sub F Implements ITest.F Console.WriteLine("F in VB") End Sub
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CHAPTER 13 INTEROPERABILITY
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Public Sub G Implements ITest.G Console.WriteLine("G in VB") End Sub Public Shared Sub Main Dim Test As ITest = New VBClass With Test .F() .G() End With End Sub 'Main End Class 'VBClass Here is the output of Listing 13-4: F in VB G in VB To minimize problems with cross-language interop, a Common Language Specification (CLS) was created that specifies common constructs across .NET languages that are usable across language boundaries. If you are careful to utilize only those features that are CLS compliant in the publicly visible portions of public types, you can be sure that your code is accessible to C# and VB and any other CLR language that recognizes CLS-compliant types. You can safely use noncompliant features inside the methods of a public type, or in private types, but the public signatures of public types must be CLS compliant for the type to be considered CLS compliant. There are many C++/CLI features that are not CLS compliant. Table 13-1 lists C++/CLI features that are not CLS compliant and suggests alternatives that are.
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Table 13-1. Major Features of C++/CLI That Are Not CLS Compliant, and Some Possible Alternatives to Them
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