By Bruce McKinney
Bruce McKinney's Hardcore visible simple is a revised variation of his consultant to complicated programming in VB. up-to-date for visible simple 5.0, this booklet is healthier at outlining many of the new language good points in visible uncomplicated 5.0, in particular its enhanced help for style libraries and object-oriented programming. the center of this booklet is devoted to methods of getting access to the Win32 API from inside of visible easy, that is provided in professional element with a library of add-on capabilities. pattern DLL's, with libraries of VB extensions are integrated. the writer additionally provides ways that visible simple does and doesn't comply with an object-oriented programming version. pattern ActiveX controls, which use periods and the hot ActiveX functions of VB5, also are provided. The final part, with a mixture of suggestions and tips for extending visible easy code, can also be fairly hit-or-miss. So is the author's humor - occasionally verging on sarcasm - which a few readers will occasionally locate frustrating. (Once an worker of Microsoft, McKinney bravely expresses his dissatisfaction with the path that his former corporation has all in favour of VB5.) notwithstanding this publication thoroughly ignores VB5's new firm good points, database and net help, that are absolutely a few of its such a lot attractive improvements, Hardcore visible simple does have much to assert approximately constructing in a single of the preferred RAD instruments builders have at the present time. it could actually certainly ease the transition into object-oriented programming for VB builders used to the older programming kind.
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Extra resources for Hardcore Visual Basic: Version 5.0
If you wrote your own Assert that looked like the one above, the Stop statement would terminate an EXE program. But since Assert is a method of Debug and Debug doesn t exist in an EXE or in a DLL or in an OCX, your program won t stop anywhere except in the debugger. Assert is worth the trouble. Professional programmers need a better system, but when you try to implement one, you ll run into some of the problems that probably prevented the Visual Basic team from providing a more useful Assert. The problem is that at run time, Visual Basic doesn t know the text of the expression that failed, and it doesn t know the file-name and line number, either.
In other words, a Boolean is the same size as a Basic Integer. Although you should declare what Windows calls BOOL as Long, you can assign the result to a Boolean. Basic automatically performs the type conversion from Long to Boolean on return values. That s the quick introduction to API calls. When you get down to actual coding, though, things get complicated. Every type of argument has its own quirks and patterns, and you must look at each type specifically. Fortunately, the Windows API never uses the Variant, Currency, Single, or Double type.
You might find a few surprises. The Microsoft Developer Studio isn t designed for debugging Visual Basic code and doesn t have a Basic expression evaluator. You might not be able to evaluate expressions the way you expect in the Watch window. If these limits seem annoying, try debugging p-code again; you ll appreciate the native code. The Time It Application The Time It program is designed to answer performance questions. Its interface is simple, as you can see in Figure 1-1. You select a performance problem from a list box.