By Andrew W Troelsen
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Additional resources for COM and . Net interoperability
The Atoms of PInvoke Now that you have created a custom DLL (and checked out the process of dynamically invoking members using the Win32 API), you will spend the rest of this chapter examining the process of calling C-based function exports from managed code. NET types and a basic set of data conversion rules. NET interoperability possible. dll, which is part of every managed application. Therefore, all you need to do to access these types is simply make reference to the namespace itself using the syntax of your favorite managed language.
NET code to call members contained in a traditional C-style DLL (including Win32 DLLs). NET attribute can be used to interact with your custom proprietary modules. Given this, let’s build a simple Win32 DLL named MyCustomDLL. NET if you prefer) and select a Win32 DLL project workspace (Figure 1-1). Figure 1-1. Creating your C-style DLL From the resulting wizard, simply select “A simple DLL” project. The first order of business is to establish the custom declspec macros, which will be used under two circumstances.
Table 1-11 gives a rundown of these fields. Table 1-11. Fields of the DllImportAttribute Type DllImportAttribute Field Meaning in Life CallingConvention Used to establish the calling convention used in passing method arguments. WinAPI, which corresponds to __stdcall. Ansi is the default). EntryPoint Indicates the string name or ordinal number of the function to be called. ExactSpelling PInvoke attempts to match the name of the function you specify with the “real” name as prototyped. dll must exactly match the name you are passing in.