By Andrew Troelsen (auth.)
COM and .NET Interoperability offers a whole evaluate of the method of creating .NET purposes that have interaction (interoperate) with latest COM code. prior to digging into that serious subject, writer Andrew Troelsen bargains a concise review of the COM structure and gives examples utilizing a variety of 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 number of concerns 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 modifying (and recompiling) .NET metadata, and the method of making customized COM/.NET conversion utilities. either intermediate and complex builders will welcome the sensible info they should speedy paintings with COM and COM+ in .NET purposes, and create .NET parts which are COM appropriate.
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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. dll binary. dll on the fly at runtime. As you will see, the managed DIIImport attribute mirnies the same pattern found with the LoadLibrary()/GetProcAddress() APis. To begin, assume you have a new Win32 console application named MyCustomDLLCppClient (a "simple project" will be fine).
Public DllimportAttribute(string dllName); II Properties. NET infrastructure stuff). public public public public public public virtual bool Equals(object obj); virtual int GetHashCode(); Type GetType(); virtual bool IsDefaultAttribute(); virtual bool Match(object obj); virtual string ToString(); } As you can see, DlllmportAttribute defines two fields (CallingConvention and CharSet), which may be assigned a value from enumerations of the same name: II Specifies the calling convention required II to call methods implemented in unmanaged code.
Ansi is the default). EntryPoint Indicates the string name or ordinal nurober of the function to be called. ExactSpelling Plnvoke attempts to match the name of the function you specify with the "real" name as prototyped. dll must exactly match the name you are passingin. PreserveSig When set to true (the default setting), an unmanaged method signature will not be transformed into a managed signature that returns an HRESULT and has an additional [out, retval] argument for the return value. NET. If you wish to set these values for your current DlllmportAttribute object instance, simply specify each as a name/value pair to the dass constructor.