Download Visual Basic 6 black book: indispensable problem solver by Steven Holzner PDF

By Steven Holzner

Thoroughly explains the the most important visible uncomplicated software set intimately. Covers the simplest visible uncomplicated programming practices, from layout instruments to flowcharts. comprises 1,000 pages of every thing visible uncomplicated 6, from radio buttons and checkboxes to XOR drawings, OLE automation, DHTML web page layout, and web Explorer four aid.

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Putting code and data together into modules hides it from the rest of the program, makes it easier to debug, makes it easier to work with conceptually, and even makes load-time of procedures in the same module quicker. Being modular—also called information-hiding (and encapsulation in true OOP)—is the backbone of working with larger programs. Divide and conquer is the idea here. • Program defensively. An example of programming defensively would be to check data passed to you in a procedure before using it.

Each of these steps may have many subparts, of course. ) As the design process continues, a model of what the program does evolves. You use this model to get a conceptual handle on the software (while keeping in mind that models are usually flawed at some level). Keeping the model in mind, then, many programmers use a program design language to start the actual coding process. Program Design Language Everyone seems to think that programmers use flowcharts, but the reality is usually different (flowcharts are nice to show to nonprogrammers, though).

Global Items Global items are accessible to all modules and forms in a project, and you declare them with the Public keyword. However, Microsoft recommends that you keep the number of global items to an absolute minimum and, in fact, suggests their use only when you need to communicate between forms. One reason to avoid global variables is their accessibility from anywhere in the program; while you’re working with a global variable in one part of a program, another part of the program might be busy changing that variable, giving you unpredictable results.

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