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New PDF release: Advanced Visual Basic 6: power techniques for everyday

By Matthew Curland

In complex visible simple 6, top visible easy professional Matthew Curland demonstrates powerhouse thoughts programmers can use to put in writing high-performance, powerful, and reusable VB code. Readers how one can leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's services and development top of the range, object-based structures. Key themes comprise how to:* keep watch over VB array variables explicitly to at once entry arbitrary reminiscence destinations* name tips that could typical, cdecl, and sophistication module services* combination entire interface implementations into any VB item* Override capabilities on any interface, together with these carried out immediately via VB* flip any user-defined kind right into a light-weight COM item* reduce reminiscence utilization in structures with numerous items* effectively create and deal with threads in ActiveX EXEs and DLLs* engage with messages to customise windowed and windowless UserControl objects.The site accompanying this publication comprises wide resource code samples to permit all recommendations with no exterior DLLs. It additionally presents built-in sort library add-ins for developing and enhancing referenced libraries, editing binary compatibility documents, and customizing the sort libraries that VB generated for ActiveX parts. With this compendium of top practices, subtle strategies, and priceless utilities, VB programmers will achieve a deeper knowing of VB's internal workings and be capable to expand its object-oriented functions.

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There are three advantages to using fixed-size arrays. LEVERAGING ARRAYS 27 When the array is a local variable, the array descriptor is allocated on the stack. Stack allocation generally performs better than heap allocation, giving fixed-size arrays the advantage here. Only arrays that are dimensioned with the Dim keyword and that specify bounds in the declaration are fixed-size. It is a common mistake to use the ReDim keyword as the primary declaration for the array variable. 'Snippet 1, compile error Dim lArr(0, 0) As Long lArr(0) = 10 'Wrong number of dimensions 'Snippet 2, no compile error, not a fixed-size array ReDim lArr(0, 0) As Long lArr(0) = 1 0 'Runtime error 9 The shape of a fixed-size array cannot be changed when the array is passed to an external function.

Once the memory for a given index has been located in the array, the resulting pointer is then treated as a non-array variable of the same type as the array. You may think that this definition of an array leaves out multi-dimensional arrays and arrays with a nonzero base index. However, these two cases are simply extensions of the one-dimensional, zero-based indexing system. With a nonzero based array (Dim MyArray(5 To 8) As Long), the lower bound is simply subtracted LEVERAGING ARRAYS 11 Element Number Byte Offset Decimal Value Memory Figure 2 .

The AddRef and Release functions take no parameters and return the current reference count on the object. Although the return value is generally the internal reference count, you cannot rely on this number to reflect the inner reference count for all object implementations. If Release returns 0, you know that the object has been destroyed. If it returns anything else, the object is still alive. QueryInterface (QI for short) is used to ask a COM object for references to specific interfaces. This involves passing an interface identifier (IID), which is what a Globally Unique IDentifier (GUID) is called when it's used to identify an interface.

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