By Matthew Curland
In complicated visible easy 6, top visible uncomplicated professional Matthew Curland demonstrates powerhouse recommendations programmers can use to jot down high-performance, strong, and reusable VB code. Readers leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's features and construction fine quality, object-based platforms. Key themes contain how to:* keep watch over VB array variables explicitly to without delay entry arbitrary reminiscence destinations* name tips that could average, cdecl, and sophistication module capabilities* combination entire interface implementations into any VB item* Override features on any interface, together with these carried out instantly by means of VB* flip any user-defined style right into a light-weight COM item* reduce reminiscence utilization in structures with numerous gadgets* effectively create and deal with threads in ActiveX EXEs and DLLs* have interaction with messages to customise windowed and windowless UserControl objects.The site accompanying this e-book comprises wide resource code samples to let all thoughts with out exterior DLLs. It additionally presents built-in variety library add-ins for developing and enhancing referenced libraries, enhancing binary compatibility records, and customizing the kind libraries that VB generated for ActiveX elements. With this compendium of top practices, refined recommendations, and important utilities, VB programmers will achieve a deeper realizing of VB's internal workings and have the ability to expand its object-oriented services.
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Extra info for Advanced Visual Basic 6: power techniques for everyday programs
VB supports three types of untyped variables in function declarations. The first type, Any, is allowed only in a VB Declare statement and accepts any nonarray type. Data passed to an As Any parameter undergoes automatic UNICODE/ANSI/UNICODE conversion. VB also recognizes the void* type as declared in a typelib. The void* type is treated like Any, except that no string conversion takes place when parameters are passed to the type. Introduced in VB5, void* support enabled a VarPtr declaration that works against any type.
ILbound is the lower bound of the array dimension. VB's LBound function reads its value directly from this element, while UBound is calculated as ILbound + cElements- 1. • fFeatures is a very important field. The flags set in fFeatures enable the SafeArray* API set to correctly destroy an array and the standard COM marshaling engine to successfully move the array between threads and processes. These flags fall into two categories: they specify either the type of elements in the array or the method used to allocate the memory for the descriptor and the array data itself.
Programming languages support nonzero based and multi-dimensional arrays so that you don't always have to calculate a zero-based index yourself. Since these more complex array types are just thinly veiled versions of a singledimensional array, I'll concentrate on zero-based, one-dimensional arrays. Array Descriptors Although the fundamental building block of any array is the memory block that contains the array's data, a VB array variable is not a pointer to the array's data block. Instead, the array variable points to a structure that describes the contents of the array.
Advanced Visual Basic 6: power techniques for everyday programs by Matthew Curland