Download Advanced Visual Basic 6: power techniques for everyday by Matthew Curland PDF
By Matthew Curland
In complicated visible simple 6, prime visible uncomplicated specialist Matthew Curland demonstrates powerhouse thoughts programmers can use to jot down high-performance, strong, and reusable VB code. Readers leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's services and construction top of the range, 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 features* mixture entire interface implementations into any VB item* Override services on any interface, together with these carried out instantly by means of VB* flip any user-defined sort right into a light-weight COM item* reduce reminiscence utilization in platforms with a number of items* effectively create and deal with threads in ActiveX EXEs and DLLs* have interaction with messages to customise windowed and windowless UserControl objects.The site accompanying this publication comprises vast resource code samples to allow all thoughts with out exterior DLLs. It additionally offers built-in kind library add-ins for developing and modifying referenced libraries, editing binary compatibility records, and customizing the kind libraries that VB generated for ActiveX parts. With this compendium of top practices, subtle concepts, and precious utilities, VB programmers will achieve a deeper figuring out of VB's internal workings and have the ability to expand its object-oriented services.
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If you don't want your array shape to be modified, you must increment the array's lock count before passing the array and decrement the lock count after. If you don't unlock your array after the call, you'll have errors and memory leaks when the array is freed, and you should provide a local error handler when errors are possible. As I mentioned earlier, an array is locked when one of its elements (as opposed to the array itself) is passed to a ByRef parameter or used in a With statement when the element is a structure type.
Trying to Erase or ReDim [Preserve] an array with cLocks > 0 generates an error 10 ("This array is fixed or temporarily locked"). • pvData is the element in an array that points to the memory for the array's data. pvData is the main player in the SafeArray structure: All other fields play supporting roles. pvData is stored as a Long value, which has the same length as the void* pointer in the OLE Automation SAFEARRAY definition. • cElements specifies the number of elements allowed per bound. • ILbound is the lower bound of the array dimension.
After all, the array just borrows the memory it uses—it does not own the memory. AssignZero ByVal VarPtrArray(Bytes()) 'Change the array descriptor so that it has no data. 'Setting cDims or cElements to 0 is also sufficient. pvData = 0 Module-Level Arrays Modifying local variables provides pretty good control over the array variable, but there are entirely different issues when you deal with module-level variables. The first issue is again a matter of scope. A standard module doesn't have a Terminate event, so you aren't notified when your array is about to go out of scope.