By Bruce Bukovics
.NET represents a brand new and greater approach of constructing software program for the home windows platform. Given the opportunity, youТd most likely rewrite all your current code within the more recent controlled code atmosphere that .NET presents. however it is tough or very unlikely to throw out all present legacy code and begin over while a brand new expertise arrives. as a substitute, you must give you the chance to maneuver ahead with new .NET improvement whereas reusing current items of demonstrated, operating code. you wish the way to interoperate with the present code till you may have an opportunity to ultimately rewrite it all in .NET.The merely recipe-style ebook at the topic, .NET 2.0 Interoperability Recipes: A Problem-Solution procedure publications home windows builders who're transitioning from local home windows code to .NET controlled code. The publication * Explains new interop gains in .NET 2.0 and VS .NET 2005 * Covers PInvoke, COM, and COM+ (other books donТt hide all 3 components) * positive factors such a lot of its instance code in C# and VB .NET, and likewise comprises a few controlled C++/CLI * Is written through a operating developer with first-hand experience.NET instruments will let you interoperate with current code. yet discovering the ideal device for the duty to hand can occasionally be a complex event. So this publication will consultant you prior myriad occasionally used interop suggestions to target these youТll use in most cases.
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Related Information See recipe 1-1 (Identifying the Unmanaged Function). 1-5. Renaming a Function Problem You need to change the name used within your managed code to reference an unmanaged function. This may be due to a naming conflict with another unmanaged function or managed method, to comply with internal naming standards, or for another reason. Solution The DllImport attribute allows you to optionally specify the entry point name of an unmanaged function. When an entry point name is specified, that name will be matched to the entry point exported from the DLL.
Low-memory conditions may cause problems during an unmanaged function call. NET interop does a good job of turning unmanaged errors into managed exceptions. As unhandled runtime errors are detected in the unmanaged code, the error is mapped to an appropriate managed exception that is then thrown. The managed code can then catch the exception and determine the best course of action. The examples that follow will illustrate several scenarios where exceptions are thrown during interop calls. qxd 34 3/2/06 9:48 AM Page 34 1-8 ■ HANDLING ERRORS FROM UNMANAGED FUNCTIONS In this first example, we will produce an exception by attempting to reference a missing or misnamed DLL.
In order to add type safety to your managed code, you would like to declare the function multiple times using different data types and possibly different names. This would make the intent of the function clearer to anyone using it. ■Note An alternative to renaming a function is to create a managed wrapper for it. Once this is done, any potential problems with the function name are eliminated since the only class referencing the function is the wrapper itself. The managed wrapper then exposes methods that conform to the internal standards and do not cause any naming conflicts.