By Andrew Troelsen (auth.)
COM and .NET Interoperability offers an entire assessment of the method of creating .NET purposes that have interaction (interoperate) with current COM code. ahead of digging into that serious subject, writer Andrew Troelsen deals a concise evaluation of the COM structure and gives examples utilizing quite a few COM frameworks (C++, ATL, and VB 6.0) in addition to the center .NET controlled languages (C# and VB .NET).
After protecting 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, growing serviced (COM+) elements utilizing controlled code, manually modifying (and recompiling) .NET metadata, and the method of creating customized COM/.NET conversion utilities. either intermediate and complicated builders will welcome the sensible details they should fast paintings with COM and COM+ in .NET functions, and easy methods to create .NET parts which are COM appropriate.
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Extra info for COM and .NET Interoperability
Public enum CharSet Ansi, Auto, None, Unicode You will see exactly how these three types are used during the remainder of this chapter. Before tackling the topic of accessing your custom DLL, let's take Plnvoke out for a simple test drive and get to know the various fields of DlllmportAttribute at the same time. NET components to interact with the Win32 API in the raw. NET base dass library exists for the very purpose of hiding the low-level API from view. Thus, although you might 26 Understanding Platform Inuocation Services not ever need to drop down to the raw Win32, Pinvoke provides the ability to do so.
Assurne you assigned a bogus value to this parameter: II There is no window with the handle 99999! lnt32, the program compiles without fail. However, when you run the application, the message fails to display. If you wish to obtain the error number thrown from MessageBoxW(), simply make use ofthe Marshai type: II Get the error! GetlastWin32Error()); If you run the application, you now find the output shown in Figure 1-7. Figure 1-7. Obtaining the last Win32 error Well, what good is it to know that the numerical value ofthe error is 1400?
Iexports This option displays all definitions exported from an executable file or DLL. 9 Chapter I Table 1-1. exe Flag Meaning in Life /imports This option displays all definitions imported to an executable file or OLL. /summary This optiondisplaysminimal information about sections, including total size. This option is the default if no other option is specified. dll. dll. dll you would find the listing shown in Figure 1-2. 844? opyt•ight (C) 11icJ•osoft Cot•p 1992- 1998. A11 t•ights 1•eset•ved .