By Matthew Curland
In complicated visible uncomplicated 6, top visible simple specialist Matthew Curland demonstrates powerhouse innovations programmers can use to jot down 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 top of the range, object-based platforms. Key themes contain how to:* keep watch over VB array variables explicitly to at once entry arbitrary reminiscence destinations* name tips that could typical, cdecl, and sophistication module services* mixture entire interface implementations into any VB item* Override features on any interface, together with these applied instantly by way of VB* flip any user-defined style right into a light-weight COM item* reduce reminiscence utilization in platforms with plenty of gadgets* accurately create and deal with threads in ActiveX EXEs and DLLs* have interaction with messages to customise windowed and windowless UserControl objects.The website accompanying this e-book comprises broad resource code samples to let all options with no exterior DLLs. It additionally offers built-in style library add-ins for developing and modifying referenced libraries, enhancing binary compatibility records, and customizing the kind libraries that VB generated for ActiveX parts. With this compendium of most sensible practices, refined concepts, and helpful utilities, VB programmers will achieve a deeper figuring out of VB's internal workings and manage to expand its object-oriented services.
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Additional info for Advanced Visual Basic 6: power techniques for everyday programs
If the array and the variable have the same type, TheArray(0) and TheVariable are equivalent. By adjusting the array declaration's type and matching the fields in your descriptor to the target type, you have a mechanism for viewing or modifying an arbitrary memory block as a specific type. The ability to view memory in this fashion is used extensively in other parts of this book. For example, with array descriptors you can numerically modify strings and share data between class instances and across threads.
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. Use the following code at any point in the function to avoid a full array copy by explicitly transferring ownership of the array to the function-name variable. 'tmp must be a variable-size array to ensure that the 'descriptor and data are on the heap instead of on the stack.
VB locks an array when you pass an element of the array to a ByRef parameter or when you use a structure-type array element in a With statement. 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.