By Matthew Curland
In complicated visible uncomplicated 6, major visible easy specialist Matthew Curland demonstrates powerhouse options programmers can use to jot down high-performance, powerful, and reusable VB code. Readers the best way to leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's functions and development fine quality, object-based structures. Key themes comprise how to:* regulate VB array variables explicitly to at once entry arbitrary reminiscence destinations* name tips that could common, cdecl, and sophistication module services* combination whole interface implementations into any VB item* Override capabilities on any interface, together with these carried out instantly by means of VB* flip any user-defined style right into a light-weight COM item* reduce reminiscence utilization in platforms with a lot 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 booklet comprises huge resource code samples to permit all suggestions with no exterior DLLs. It additionally offers built-in variety library add-ins for developing and enhancing referenced libraries, editing binary compatibility records, and customizing the kind libraries that VB generated for ActiveX elements. With this compendium of top practices, refined recommendations, and useful utilities, VB programmers will achieve a deeper knowing of VB's internal workings and have the capacity to expand its object-oriented functions.
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Extra resources for Advanced Visual Basic 6: power techniques for everyday programs
VT_USERDEFINED covers all other object types. VT_USERDEFINED also has type information associated with it, such as the object's IID and information about the IID's base interfaces. VB interacts with the IUnknown interface when you use the Set statement, when you pass an object variable to a parameter during a function call, and when you use the Is or TypeOf... Is operators. Let's first look at the Set statement. Set and IUnknown A VB object variable can have two states: Is Nothing (no current reference) and Not Is Nothing (a current reference).
When the VB compiler encounters a Set statement, it examines the types of the variables on both sides of the expression. ) In this table, the variable's type is shown to the left of the equals statement going down, and the type of the right-hand side expression going across. The types represented fall into five categories. • 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. VB performs a QI when you assign between different types, which generally happens only when you try to get an implemented interface from an object.
Advanced Visual Basic 6: power techniques for everyday programs by Matthew Curland