Visual Basic

Download Advanced Visual Basic 6: power techniques for everyday by Matthew Curland PDF

By Matthew Curland

In complex visible easy 6, major visible uncomplicated professional Matthew Curland demonstrates powerhouse innovations programmers can use to write down high-performance, strong, and reusable VB code. Readers methods to leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's features and construction top of the range, object-based structures. Key subject matters contain how to:* keep watch over VB array variables explicitly to at once entry arbitrary reminiscence destinations* name tips to ordinary, cdecl, and sophistication module services* mixture entire interface implementations into any VB item* Override services on any interface, together with these carried out instantly via VB* flip any user-defined kind right into a light-weight COM item* reduce reminiscence utilization in platforms with various items* accurately create and deal with threads in ActiveX EXEs and DLLs* engage with messages to customise windowed and windowless UserControl objects.The website accompanying this e-book includes huge resource code samples to permit all concepts with out exterior DLLs. It additionally offers built-in kind library add-ins for developing and enhancing referenced libraries, editing binary compatibility records, and customizing the kind libraries that VB generated for ActiveX parts. With this compendium of most sensible practices, subtle innovations, and important utilities, VB programmers will achieve a deeper figuring out of VB's internal workings and have the ability to expand its object-oriented functions.

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You also won't get an error if you specify the wrong number of indices, although the program will crash if you specify too many indices. When bounds checking is off, the only field the runtime looks at is the ILbound of each SafeArrayBound. cDims and cElements are ignored. So for a compiled executable, your code can simply ignore the fact that you have a multi-dimensional array. You simply need to know the lower bound of the first dimension and the total number of items in the array. There is no need to modify the array descriptor.

Without the With statement, ClearArrayData would require some extra code to be safe. As you can see from the With-less code shown here, it is much easier to use the With statement. pvData = 0 End With Array Options: Beyond Fixed or Variable Size VB makes you choose between two types of arrays: fixed-size and variable. When you have access to the array descriptor, you can get more flexibility with your arrays by using the best features of each type. I'll first look at the advantages of using fixed-size arrays, then look at enhancing variable-size arrays to get the same benefits.

LEVERAGING ARRAYS The remaining three flags indicate that extra information about the array's type is available in the memory immediately before the SafeArray structure. These values are used to optimize marshaling and to destroy arrays of structures. The first flag, FADF_HAVEVARTYPE (&H80), indicates that the two-byte variant type of the element is stored four bytes before the start of the SafeArray structure. FADF_HAVEIID (&H40) indicates that the 16 bytes preceding the descriptor hold the IID of the type.

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