By Sean P. Alexander (Foreword)
Within the authors' phrases, "Our major objective in penning this ebook is to write down the main complex ebook but to be had on Microsoft visible Basic." Written from the viewpoint of the pro visible uncomplicated developer, "Advanced Microsoft visible uncomplicated, 2d variation" explores the entire percentages open to a developer utilizing visible simple as his or her fundamental client/server improvement software. New to this variation is fabric on new information entry applied sciences, accessibility matters for the bodily challenged, elevated aid for IIS, BackOffice and combined language programming, and company help for server facet items, equivalent to the part gallery and Microsoft Transaction Server. The accompanying CD-ROM comprises pattern code and worthy utilities constructed and proven by way of the authors, The Mandelbrot Set.
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Extra info for Advanced Microsoft Visual Basic 6.0 2nd edition
So if we write some functions named SubA, SubB, and SubC and arrange for SubA to call SubB and SubB in turn to call SubC, we can spot the potential problem. ) If SubC generates an error, who handles it? Well, it all depends. If we don't handle it, Visual Basic will. Number in its list of error strings, produces a message box with the string, and then executes an End for you. If, as in Figure 1-3, SubA handles errors, Visual Basic will search up through the call chain until it finds SubA (and its error handler) and use that error handler instead of its own default error handler.
Or then again, maybe not. In Visual Basic, Erl, a Visual Basic (undocumented in Visual Basic 4, 5, and 6 but present in all versions of Visual Basic thus far) "global variable," gives you access to the line number of any erroring line of code. So by using line numbers and by using Erl in your error handlers, you can determine which line of code erred—wow! What happens to Erl if you don't use line numbers? Easy—it will always be 0. Of course, you won't want to start typing line numbers in by hand.
Other product and company names mentioned herein may be the trademarks of their respective owners. Acquisitions Editor: Stephen Guty Project Editor: Wendy Zucker Technical Editors: Marc Young, Jean Ross Foreword Since its inception in 1991, Microsoft Visual Basic has revolutionized the way developers create applications for Microsoft Windows. Through features such as IntelliSense, statement completion, ActiveX Control creation, a native code compiler, and database access, Microsoft has worked hard to keep developers well-equipped with the latest innovations in rapid application development.