Visual Basic

Download VBScript in nutshell by Paul Lomax PDF

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By Paul Lomax

VBScript in a Nutshell specializes in the full VBScript language, and illustrates the information varieties, variables, constants, arrays, statements, and features that shape the middle elements of the language. The booklet units forth a close dialogue of the way to name scripts and explains the similarities and variations among VBScript and visible simple and the way VBScript differs from JavaScript. The higher a part of this ebook is an alphabetical VBScript language connection with all VBScript keyword phrases. It files either the most obvious and the not-so-obvious, together with quite a few "gotchas" and anomalies that reason programmers lots misplaced time and unnecessary frustration. different chapters disguise the MSIE, lively Server and Outlook item types, which enable VBScript to "control" its host program. Appendixes comprise listings of VBScript key words by way of type, in addition to the homes, tools, and occasions of ordinary ActiveX and intrinsic HTML controls. even if you are utilizing VBScript to create client-side or server-side scripts for an online setting, VBScript in a Nutshell is the one e-book you will have by means of your side--a whole and easy-to-use language reference.

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Run the script again, with the mistake still there. " We now know what we are looking for: the message tells us that we haven't declared a variable, and gives us the line number on which the error occurred. Even in a complex script, it usually takes only a couple of seconds to find and correct the bug. Using Option Explicit is good programming practice. It forces us to declare all variables and constants with Dim, and, should we make an error in the script, makes it easier to find. 6 Array Variables The types of variables we have dealt with so far have contained single values, or, to give them their correct title, are scalar variables.

Before we look at the types of arrays we have at our disposal, let's quickly cover some of the terminology used when talking about arrays. , defining its size). The individual data items within the array are known as elements, and the reference number we use to access these elements is known as an index. The lowest and highest index numbers are known as bounds or boundaries. There are four main types of arrays: arrays can be either fixed or dynamic; arrays can also be either one-dimensional or multidimensional.

This location is of no consequence to us; all we have to do is remember the name. When we use the name, the script engine will go to the correct memory location and either retrieve the data stored there or change the data, depending upon our instructions. It is important therefore to learn the rules for naming variables: • Variable names can be no more than 255 characters in length. Variable names tend to become pretty unreadable after about 20 characters anyhow, which then defeats the purpose of having longer variable names.

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