Visual Basic

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

By Matthew Curland

ISBN-10: 0201707128

ISBN-13: 9780201707120

In complex visible simple 6, best visible simple professional Matthew Curland demonstrates powerhouse concepts programmers can use to put in writing high-performance, powerful, and reusable VB code. Readers easy methods to leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's services and construction fine quality, object-based platforms. Key subject matters contain how to:* regulate VB array variables explicitly to at once entry arbitrary reminiscence destinations* name tips to common, cdecl, and sophistication module capabilities* mixture entire interface implementations into any VB item* Override features on any interface, together with these carried out immediately through VB* flip any user-defined style right into a light-weight COM item* reduce reminiscence utilization in structures with lots of gadgets* competently create and deal with threads in ActiveX EXEs and DLLs* engage with messages to customise windowed and windowless UserControl objects.The site accompanying this booklet comprises huge resource code samples to permit all ideas with no exterior DLLs. It additionally offers built-in variety library add-ins for growing and enhancing referenced libraries, enhancing binary compatibility documents, and customizing the kind libraries that VB generated for ActiveX parts. With this compendium of most sensible practices, refined innovations, and worthwhile utilities, VB programmers will achieve a deeper figuring out of VB's internal workings and have the capacity to expand its object-oriented functions.

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Returning Arrays from Functions In VB, the name of a Function or Property Get procedure is also a local variable name within the same procedure. As a way of avoiding data duplication, I encourage you to use this implicit variable name in the main body of your code instead of just once at the end of the function. For example, if you have a function that returns a structure, you should use the first snippet shown below, not the second. 'Good code Function FillStruct() As Struct With FillStruct 'Fill in data End With End Function 'Wasteful code, unnecessary copy Function FillStruct() As Struct Dim tmp As Struct LEVERAGING ARRAYS 37 With tmp 'Fill in data End With FillStruct = tmp End Function It would be great if we could apply this principle to functions that return arrays.

In this table, the variable's type is shown to the left of the equals statement going down, and the type of the right-hand side expression going across. The types represented fall into five categories. • UNK=VT_UNKNOWN type • DISP=VT_DISPATCH • USER:DISP= VT_USERDEFINED with IDispatch support • USER:UNK=VT_USERDEFINED with no IDispatch support • RHLS=LHS means that the type of the left-hand variable is exactly the same as the right-hand expression Notice how assigning to VT_UNKNOWN never performs a QI, and assigning to the same user-defined type never performs a QI.

For example, a structure with {Long, Integer} has a LenB of 6 and a cbElements of 8, but {Integer, Integer, Integer} has a LenB of 6 and a cbElements of 6 as well. The easiest way to determine the element count is to ask the array itself: look at the cbElements field, or use the SafeArrayGetElemsize API. UDif(VarPtrd), VarPtr(0)). The one thing you can't assume is that the element size and LenB are equivalent for anything other than simple types. Memory Layout of Multi-Dimensional Arrays SafeArrays use a row-major layout, unlike C+ + , which uses a column-major layout.

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

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