By Matthew Curland
In complex visible easy 6, prime visible easy specialist Matthew Curland demonstrates powerhouse recommendations programmers can use to put in writing high-performance, powerful, and reusable VB code. Readers how one can leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's services and development high quality, object-based platforms. Key themes comprise how to:* keep an eye on VB array variables explicitly to without delay entry arbitrary reminiscence destinations* name tips to ordinary, cdecl, and sophistication module services* combination whole interface implementations into any VB item* Override features on any interface, together with these carried out instantly through VB* flip any user-defined sort right into a light-weight COM item* reduce reminiscence utilization in structures with lots of gadgets* adequately create and deal with threads in ActiveX EXEs and DLLs* engage with messages to customise windowed and windowless UserControl objects.The site accompanying this e-book comprises huge resource code samples to permit all options with no exterior DLLs. It additionally offers built-in kind library add-ins for growing and modifying referenced libraries, enhancing binary compatibility records, and customizing the sort libraries that VB generated for ActiveX parts. With this compendium of most sensible practices, subtle ideas, and useful utilities, VB programmers will achieve a deeper knowing of VB's internal workings and have the ability to expand its object-oriented functions.
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Extra resources for Advanced Visual Basic 6: power techniques for everyday programs
The first type, Any, is allowed only in a VB Declare statement and accepts any nonarray type. Data passed to an As Any parameter undergoes automatic UNICODE/ANSI/UNICODE conversion. VB also recognizes the void* type as declared in a typelib. The void* type is treated like Any, except that no string conversion takes place when parameters are passed to the type. Introduced in VB5, void* support enabled a VarPtr declaration that works against any type. The one downside of both Any and void* is that the compiler does not support passing an array to either of these types.
Call cbExtraStack End Sub I mentioned earlier that a local fixed-size array actually uses heap allocation to support arbitrarily large data blocks. If you know the size of the array you LEVERAGING ARRAYS 31 want at compile time and you want to eliminate the extra heap allocation, you can define your own type with a single array element. This gives you much better performance both locally and with fixed-size module level arrays. Also, if a module-level array must absolutely be valid until every line of teardown code in every module has completed, you should use this technique with your array.
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. You might as well use a local descriptor in this case because the savings are minimal.
Advanced Visual Basic 6: power techniques for everyday programs by Matthew Curland