By Andrew W Troelsen
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Extra info for COM and . Net interoperability
To begin, assume you have a new Win32 console application named MyCustomDLLCppClient (a “simple project” will be fine). h file directly in the project directory (you do this because the file has the C definitions of your custom UDTs). When you need to load a C-based DLL and invoke its members dynamically, you must make use of three key Win32 API calls, which are explained in Table 1-3. Table 1-3. dll’s internal use counter by one and removes the binary from memory when the counter is at zero. GetProcAddress() This API function is used to invoke a given export within the loaded module.
NET-based DLLs are not registered in the system registry at all, but are typically deployed in the same directory as the launching client (that is, as a private assembly). NET DLLs can be shared by multiple client applications on a given machine by placing the assembly within a well-known location called the Global Assembly Cache (GAC). NET DLL, given that they are not registered within the system registry. The simplest approach to deploy your custom DLLs is to place them directly in the directory of the calling client (typically called the application directory).
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. First, if the code base defines the MYCSTYLEDLL_EXPORTS symbol, the macro will expand to __declspec(dllexport).