Visual Basic

Read e-book online Advanced Microsoft Visual Basics 6.0 PDF

By Mandelbrot Set International Ltd

ISBN-10: 1572318937

ISBN-13: 9781572318939

Within the authors' phrases, "Our major objective in penning this publication is to jot down the main complicated booklet but on hand" on Microsoft visible easy. Written from the viewpoint of the pro visible uncomplicated developer, complicated MICROSOFT visible simple, 2d version explores the entire percentages open to a developer utilizing visible easy as his or her fundamental client/server improvement device. New to this variation is fabric on new information entry applied sciences, accessibility matters for the bodily challenged, elevated aid for IIS, BackOffice(r) and combined language programming, and firm aid for server part gadgets, similar to the part gallery and Microsoft Transaction Server. The accompanying CD-ROM comprises pattern code and worthy utilities constructed and established by means of the authors, The Mandelbrot Set.

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End If All very messy, especially where the language lacks the ability to do an assignment in a conditional expression (as is the case in Visual Basic and is not the case in C). Consider someone writing the test using implicit expression evaluation: If CreateThing() Then If CreateThing works, it returns 0, which causes the conditional not to execute any code in the body of the compound statement. Yikes! Imagine what code fails to execute all because someone forgot to test against SUCCESS. Because any nonzero value is evaluated as True (in an If), using a value other than 0 (say, a negative value) to indicate failure can be equally dangerous.

DateAdd(Interval, Number, CDate(v)) End Function Private Sub Vali_Date(ByVal v As Variant) ' If 'v' is a string containing a valid date expression ... If vbString = VarType(v) And IsDate(CStr(v)) Then ' If we've got a four digit year then we're OK, 38 Tip 19: Tighten up Visual Basic's type checking. Tip 19: Tighten up Visual Basic's type checking. 39 ' else we throw an err. ) in SomeSub will result in a runtime exception being thrown because the date expression being passed is ambiguous ("01 01 98").

Yes, but that would be overkill because we've already got a real iString in the preceding code. What we need to do is change the code to Set SomeFunc = s. Set is the way you assign an object pointer to an object variable. Anyway, it's simply a semantics change and so should be rejected out of hand. What we need is some way to describe to the language how to construct an iString from a String and then assign this new iString—not using Set—to the function name. (This is all getting us too close to C++, so I'll leave this well alone, although you might want to consider where you'd like Visual Basic to head as a language).

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Advanced Microsoft Visual Basics 6.0 by Mandelbrot Set International Ltd

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