By Bruce Bukovics
.NET represents a brand new and greater manner of constructing software program for the home windows platform. Given the opportunity, youТd most likely rewrite your entire current code within the more moderen controlled code setting that .NET presents. however it is hard or very unlikely to throw out all latest legacy code and begin over whilst a brand new expertise arrives. as a substitute, you must give you the chance to maneuver ahead with new .NET improvement whereas reusing latest items of demonstrated, operating code. you wish how to interoperate with the prevailing code until eventually you could have an opportunity to ultimately rewrite it all in .NET.The basically recipe-style e-book at the topic, .NET 2.0 Interoperability Recipes: A Problem-Solution method publications home windows builders who're transitioning from local home windows code to .NET controlled code. The ebook * Explains new interop beneficial properties in .NET 2.0 and VS .NET 2005 * Covers PInvoke, COM, and COM+ (other books donТt hide all 3 parts) * positive factors so much of its instance code in C# and VB .NET, and in addition comprises a few controlled C++/CLI * Is written via a operating developer with first-hand experience.NET instruments will let you interoperate with present code. yet discovering the ideal software for the duty to hand can occasionally be a troublesome event. So this ebook will consultant you earlier myriad from time to time used interop innovations to target these youТll use normally.
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Additional resources for .NET 2.0 Interoperability Recipes: A Problem-Solution Approach
Ansi. Ansi. qxd 3/2/06 9:48 AM Page 25 1-7 ■ USING DATA TYPES THAT IMPROVE PERFORMANCE Even though we declared and executed a function named CombineStrings, PInvoke was able to execute the correct version based on the character set selected. Be aware that the ExactSpelling field of the DllImport attribute also affects this automatic behavior based on the CharSet. As the name implies, if the ExactSpelling field is true, the function name you declare must exactly match the name of the unmanaged function.
As is always the case, you do need to know a bit about the function in order to identify the ways that it can fail. DLL. Notice that in this example, we included two catch statements: one for EntryPointNotFoundException and another for DllNotFoundException. In cases where more than one type of exception is possible, you’ll need to catch each exception individually. An easy mistake to make when using PInvoke is to incorrectly declare the function, specifying the wrong return data type or an incorrect number and type of input parameters.
0); } This function uses the C run-time library function islower that returns a nonzero result if the integer passed to it is an ANSI lowercase character. An uppercase ANSI character will return zero. It’s a trivial function, but it does demonstrate the difference in performance when using blittable versus non-blittable parameters. As written, this function uses non-blittable data types. The input parameter is a char, which is actually an 8-bit integer representing an ANSI character. Since it is defined as a char in the function signature, a conversion must take place when passing the value from the managed to unmanaged code.