By Matthew Curland
In complicated visible simple 6, major visible simple specialist Matthew Curland demonstrates powerhouse recommendations programmers can use to put in writing high-performance, strong, and reusable VB code. Readers how one can leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's functions and construction high quality, object-based structures. Key issues contain how to:* keep watch over VB array variables explicitly to without delay entry arbitrary reminiscence destinations* name tips to ordinary, cdecl, and sophistication module capabilities* combination entire interface implementations into any VB item* Override capabilities on any interface, together with these applied instantly through VB* flip any user-defined sort right into a light-weight COM item* reduce reminiscence utilization in platforms with loads of gadgets* 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 includes wide resource code samples to permit all options with out exterior DLLs. It additionally offers built-in sort library add-ins for growing and modifying 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 concepts, and worthy utilities, VB programmers will achieve a deeper figuring out of VB's internal workings and have the capacity to expand its object-oriented services.
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Extra info for Advanced Visual Basic 6: power techniques for everyday programs
The problem with assigning the temporary array variable to the function name is that you can end up copying the entire array. There are two ways to avoid this, one provided by VB, and one by VarPtrArray. If you assign a local array to the implicit function name variable immediately before an Exit Function/Property or End Function/Property statement, VB automatically transfers the array instead of copying it. If there is an intervening instruction (End If included, comments excluded), the array is copied instead of transferred.
You can get down to zero heap allocations by using stack allocation along with your own array descriptor. Although it uses a little more code, this variable-size array allocation mechanism is the least expensive. Stack allocations are valid only during the lifetime of the current function, so you can use this type of array only in the current function and any functions it calls directly. The stack allocation routines are described in the "Stack Allocation" section in Chapter 1 1 . Call cbExtraStack End Sub I mentioned earlier that a local fixed-size array actually uses heap allocation to support arbitrarily large data blocks.
Locking the array by initializing the descriptor with cLocks = 1 stops the unwanted memory destruction dead in its tracks. The disadvantage to this method is that VB still pays attention to pvData during teardown, so you have to make sure pvData is zero whenever you leave local scope. There are three ways to handle this. • Put your array in a structure and add a termination code to using lightweight objects. The "ArrayOwner Lightweight" section in Chapter 8 shows how this is done. • Clear the module-level array variable whenever you leave function scope, but leave the structure in place.
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