By Andrew Troelsen (auth.)
COM and .NET Interoperability offers a whole evaluate of the method of creating .NET functions that engage (interoperate) with latest COM code. earlier than digging into that severe subject, writer Andrew Troelsen deals a concise evaluate of the COM structure and offers examples utilizing numerous COM frameworks (C++, ATL, and VB 6.0) in addition to the center .NET controlled languages (C# and VB .NET).
After overlaying the preliminaries, the ebook explores a variety of matters that come up in interoperability, together with interacting with the Win32 API, dynamically producing resource code through System.CodeDOM, developing serviced (COM+) parts utilizing controlled code, manually enhancing (and recompiling) .NET metadata, and the method of creating customized COM/.NET conversion utilities. either intermediate and complex builders will welcome the sensible details they should quick paintings with COM and COM+ in .NET functions, and how one can create .NET parts which are COM appropriate.
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Extra resources for COM and .NET Interoperability
When you are making use ofPinvoke, you don't make use ofthese Win32-centric type definitions directly, but rather a managed equivalent. NET data type. Table 1-4. Char ANS! Double 64 bits DWORD unsigned long System. Ulnt32 32 bits FLOAT float System. lnt16 16 bits UINT unsigned int System. Ulnt32 32 bits ULONG unsigned long System. Ulnt32 32 bits WORD unsigned short System. NET interoperability. NET) members that provides a bridge between managed and unmanaged constructs. When you are working with Pinvoke proper (meaning you arenot interested in communicating with COM -based DLLs), you really only need to access a very small subset of its overall functionality.
T OK I[ I[ De\ele (Mal Figure 1-5. NET) DLL. Given that the "Path" variable defines numerous values (separated by semicolons), you are free to place your custom DLLs in within any documented paths. dll in your %windir% \System32 subdirectory (Figure 1-6). ma ... , and Fold~r Tasks Rename ths file Figure 1-6. Your custom DLL is now within the %windir%\System32 path. 14 Understanding P/atform Invocation Services A Dynamic C++ OLL Client Before you learn how to trigger function exports using managed languages, let's take a brieflook at a traditional C-based dient application.
As you can see, the ExactSpelling field basically allows you to be "lazy" and ignore the W or A suffixes. However, Plnvoke clearly needs to ultimately resolve the exact name of the function you wish to call. When you leave ExactSpelling at its default value ("false"), the Ietter A is appended to the method name under ANSI environments and the Ietter Wunder Unicode environments. Specifying the Character Set Ifyou wish to explicitly specify the character set used to marshal data between managed code and the raw DLL export, you may set the value of the CharSet field using a member from the related CharSet enumeration (Table 1-12).