By Matthew Curland

In complex visible simple 6, major visible simple professional Matthew Curland demonstrates powerhouse innovations programmers can use to put in writing high-performance, powerful, and reusable VB code. Readers the right way to leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's functions and construction fine quality, object-based structures. Key issues comprise how to:* keep an eye on VB array variables explicitly to without delay entry arbitrary reminiscence destinations* name tips to typical, cdecl, and sophistication module capabilities* combination entire interface implementations into any VB item* Override capabilities on any interface, together with these applied instantly via VB* flip any user-defined style right into a light-weight COM item* reduce reminiscence utilization in structures with various gadgets* adequately create and deal with threads in ActiveX EXEs and DLLs* engage with messages to customise windowed and windowless UserControl objects.The site accompanying this e-book comprises huge resource code samples to let all options with out exterior DLLs. It additionally presents built-in kind library add-ins for developing and enhancing referenced libraries, editing binary compatibility documents, and customizing the kind libraries that VB generated for ActiveX elements. With this compendium of top practices, refined options, and useful utilities, VB programmers will achieve a deeper realizing of VB's internal workings and be ready to expand its object-oriented services.

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Extra info for Advanced Visual Basic 6: power techniques for everyday programs

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I'll show the first approach and leave the second as an exercise. In order to normalize an incoming array, you need to turn it into a zero-based, one-dimensional array with the total element count saved in the first dimension. In other words, you change the cDims, cElements, and ILbound items in the now familiar SafeArrayld structure. Just cache the old values, modify the descriptor, and restore the old values when you're done processing the array. Assign ByVal VarPtrArray(m_pSABounds), _ VarPtr(m_SABounds) End With End Sub 'Modify the array descriptor to be one dimensional and zero 'based to enable processing any array as a one-dimensional 'array.

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. Assigning to an As Object variable (VT_DISPATCH) only performs a QI if the type on the right is not derived from IDispatch. If you assign between VB-defined object types, which are always derived from IDispatch, VB never performs a QI when assigning to an As Object variable, nor does it perform a QI when assigning to a variable of the same type.

HelpContext End With End Function There's just one more twist to the normalized array story: none of the normalization code you see here is necessary in a natively compiled executable when bounds checking is turned off. In compiled code, you won't get an out-ofrange error if you specify an invalid index value. 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.

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