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CHAPTER 12 INTEROPERABILITY
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catch(SEHException^ e) { Console::WriteLine("{0}\nErrorCode: 0x{1:x}", e->ToString(), e->ErrorCode); } byval = false; try { throw_native_exception(byval); } catch(NativeException* native_exception) { wprintf(L"Caught NativeException: %s\n", native_exception->GetMessage()); } catch(SEHException^ e) { Console::WriteLine("{0}\nErrorCode: 0x{1:x}", e->ToString(), e->ErrorCode); } } The output Listing 12-24 is shown here: Caught NativeException: Native Exception By Value Caught NativeException: Native Exception on Native Heap
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Interop with COM HRESULTs
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A COM HRESULT is wrapped as an exception. It may appear as a specific exception type, such as OutOfMemoryException for the HRESULT E_OUTOFMEMORY, or, if there is no specific mapping provided, as a COMException, which has an ErrorCode property that has the original HRESULT value.
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Summary
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This chapter covered various aspects of interoperability interop with other .NET languages, interop with native code including P/Invoke, the various compilation modes available, and how to expose native code to other .NET languages. The text touched briefly on COM interop. You also saw pointer types useful in interop, such as interior_ptr and pin_ptr, native and managed entry points, the __clrcall calling convention, double thunking and how to avoid it, how to include a native class in a managed class, how to include a managed class in a native class with gcroot and auto_gcroot, and finally, how exceptions and errors in native code surface in managed code.
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APPENDIX
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Quick Reference
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his appendix covers the new keywords introduced in C++/CLI, specifies which are also reserved words, and defines and lists contextual keywords and whitespaced keywords. This appendix includes a reference table for features available in native, mixed, pure, and safe modes. You ll also find a summary of the syntax introduced in C++/CLI.
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Keywords and Contextual Keywords
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Some new keywords were introduced in the C++/CLI bindings. Many new keywords introduced in C++/CLI are sensitive to the context in which they are used, so as to avoid creating new reserved words in order not to interfere with existing identifiers. When used in the proper syntactic position, contextual keywords are interpreted with the keyword meaning. When used in any other position, they may be used as identifiers. This enables your code to continue to use a variable that happens to collide with a C++/CLI contextual keyword without any special marking or modification. This also enables C++/CLI to use keywords that otherwise would be common variable names. There are several new keywords that are not contextual, as described in Table A-1: gcnew, generic, and nullptr. Table A-2 shows the new contextual keywords.
Table A-1. C++/CLI Keywords
Keyword
gcnew
Description
Allocates instances of reference types on the garbage-collected (managed) heap Declares a parameterized type (generic) that is recognized by the runtime Evaluates to the null value for a pointer, indicating an unassigned pointer
Usage
R^ r = gcnew R();
generic
generic <typename T> ref class G { /* ... */ };
nullptr
R^ r = nullptr;
APPENDIX QUICK REFERENCE
Table A-2. C++/CLI Contextual Keywords
Contextual Keyword
abstract
Description
Declares a class that has some unimplemented methods, used as a base class. Objects cannot be instantiated from this class. When used on a method, declares that the method will not be implemented. Declares an object that represents a type-safe function pointer. Declares an event, an occurrence that triggers method calls. Captures program flow after a try/catch block. Used in the for each statement. Specifies a field that can only be modified in a constructor. Specifies that access to a member is restricted to within an assembly. Specifies a value that is a literal constant. Indicates that a function is intended to be a virtual override of the base class function of the same name. Declares a field-like member on a type. Indicates a type that cannot be used as a base class or a method cannot be overridden. Used in the declaration of generics to specify constraints on the types that may be used as type arguments for a generic type or function.
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