By Matthew Curland

ISBN-10: 0201707128

ISBN-13: 9780201707120

In complicated visible uncomplicated 6, major visible simple professional Matthew Curland demonstrates powerhouse strategies programmers can use to put in writing high-performance, powerful, and reusable VB code. Readers tips on how to leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's features and construction top quality, object-based structures. Key themes contain how to:* keep an eye on VB array variables explicitly to without delay entry arbitrary reminiscence destinations* name tips that could usual, cdecl, and sophistication module services* combination whole interface implementations into any VB item* Override capabilities on any interface, together with these carried out instantly by way of VB* flip any user-defined variety right into a light-weight COM item* reduce reminiscence utilization in structures with a lot of gadgets* 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 ebook includes vast resource code samples to permit all ideas with no exterior DLLs. It additionally offers built-in kind library add-ins for growing and enhancing referenced libraries, enhancing binary compatibility documents, and customizing the sort libraries that VB generated for ActiveX elements. With this compendium of most sensible practices, refined ideas, and useful utilities, VB programmers will achieve a deeper figuring out of VB's internal workings and be capable of expand its object-oriented services.

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1 0 4 0 100000 1000 AO 86 01 00 E8 03 00 00 OA 00 00 2 8 10 00 00 00 00 4 6 5 3 24 12 16 20 0 -10 -1000 -1000000 00 F6 FF FF FF 18 FC FF FF 60 79 FE FF The memory layout of a seven-element array of Longs. from the index to form a zero-based index, which is then used to locate the element. In a multi-dimensional array (the number of dimensions is also called the rank of the array), the vector of indices is used to calculate a zero-based index, which is then plugged into the + * formula.

VT_USERDEFINED covers all other object types. VT_USERDEFINED also has type information associated with it, such as the object's IID and information about the IID's base interfaces. VB interacts with the IUnknown interface when you use the Set statement, when you pass an object variable to a parameter during a function call, and when you use the Is or TypeOf... Is operators. Let's first look at the Set statement. Set and IUnknown A VB object variable can have two states: Is Nothing (no current reference) and Not Is Nothing (a current reference).

Among the Variant types, there are three object types that VB can handle: VT_DISPATCH, VT_UNKNOWN, and VT_USERDEFINED. A VT_DISPATCH type corresponds to VB's Object type. This type of object supports IDispatch (that is, late binding). VT_UNKNOWN does not have a corresponding type in VB, but VB can call functions with this parameter type. VT_USERDEFINED covers all other object types. VT_USERDEFINED also has type information associated with it, such as the object's IID and information about the IID's base interfaces.

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


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