By Matthew Curland
In complex visible uncomplicated 6, top visible easy specialist Matthew Curland demonstrates powerhouse options programmers can use to put in writing high-performance, strong, and reusable VB code. Readers tips on how 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 structures. Key subject matters comprise how to:* keep watch over VB array variables explicitly to at once entry arbitrary reminiscence destinations* name tips that could ordinary, cdecl, and sophistication module services* mixture entire interface implementations into any VB item* Override capabilities on any interface, together with these applied immediately via VB* flip any user-defined sort right into a light-weight COM item* reduce reminiscence utilization in platforms with various gadgets* correctly 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 includes wide resource code samples to let all innovations with out exterior DLLs. It additionally offers built-in style library add-ins for growing and modifying referenced libraries, editing binary compatibility documents, and customizing the sort libraries that VB generated for ActiveX elements. With this compendium of most sensible practices, refined concepts, and necessary utilities, VB programmers will achieve a deeper figuring out of VB's internal workings and have the capacity to expand its object-oriented features.
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Additional info for Advanced Visual Basic 6: power techniques for everyday programs
AddRef increments an internal reference count, and Release IUNKNOWN: AN UNKNOWN QUANTITY 41 decrements the same count. When the internal reference count reaches 0, Release calls the object's Terminate event and then frees the object's memory. The AddRef and Release functions take no parameters and return the current reference count on the object. Although the return value is generally the internal reference count, you cannot rely on this number to reflect the inner reference count for all object implementations.
80 92 LEVERAGING ARRAYS 17 You can also use VarPtrArray to look at the additional information stored at the beginning of the array. Generally, you won't need to do this in code, but it is a useful exercise for seeing the layout of the array descriptor. All the support functions shown here are provided with VBoostTypes. UDif performs pointer arithmetic using unsigned arithmetic. Dim ObjArray() As VBA. Collection Dim Guid As VBGUID Dim GuidString As String * 38 ReDim ObjArray(0) 'Read the IID from the memory stored at 16 bytes before 'the beginning of the normal SAFEARRAY descriptor.
After all, there is actually LEVERAGING ARRAYS 21 nothing to clean up. Although it is safe to leave scope because no memory is being freed, you can do VB a small favor by clearing either the data pointer or the array variable itself before the variable goes out of scope. Clearing the variable leaves the least amount of work for VB to do; Clearing the pvData field is also a viable option. Setting pvData, cDims, or cElements to zero stops the memory from being cleaned up as the array leaves scope.
Advanced Visual Basic 6: power techniques for everyday programs by Matthew Curland