Visual Basic

Download e-book for kindle: VB and VBA in a Nutshell: The Languages by Paul Lomax

By Paul Lomax

ISBN-10: 1565923588

ISBN-13: 9781565923584

ISBN-10: 1565929306

ISBN-13: 9781565929302

The net documentation of VB/VBA language elements follows the 80/20 rule: the elemental proof it's worthwhile to use a language assertion are supplied within the documentation. however the extra 20 percentage it's essential to use it successfully is conspicuously absent. to a pro VB/VBA programmer, this lacking documentation isn't really a luxurious; it's a necessity. In VB & VBA in a Nutshell: The Language , it really is eventually to be had. This e-book boils down the necessities of the VB and VBA languages right into a unmarried quantity, together with undocumented and little-documented components crucial to daily programming. the majority of the e-book is an alphabetical reference to the statements, methods, and services of the VB/VBA language. every one access contains its syntax, a longer dialogue of the way the language build works, programming assistance for utilizing the build successfully, and "gotchas" to prevent on your programming. despite how a lot event you may have programming with VBA, this is often the publication you will choose up time and time back, either as your general reference consultant and as a device for troubleshooting and picking out programming difficulties.

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Extra info for VB and VBA in a Nutshell: The Languages

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However, another event, the Activate event, is executed in this situation. You shouldn’t use the Activate event to write application initialization code because it executes every time the form regains the focus. Using a Code Module at Startup The preferred method of starting any Visual Basic application is to use a Sub Main procedure. The Sub Main procedure To create a Sub Main, you need to include a code module in your project. Then simply type the following: Sub Main() Visual Basic automatically adds an End Sub line for you.

All rights reserved. 35 The Variant Like the VarType function, TypeName is read-only; you can use it to determine the subtype of a variable, but you can’t use it to explicitly set the type of a variable. To do this, you must use the conversion functions discussed in the previous section. The following table shows the string that the TypeName function returns for each data subtype. Return Value Boolean Byte Currency Date Decimal Double Empty Error Integer Long Nothing Null Object Single String Variant() Unknown Data Subtype Actual type name of an object Boolean value: True or False Byte value Currency value Date or time value Decimal (single-precision) value Double-precision floating-point value Uninitialized Error Integer value Long integer value Object variable that doesn’t yet refer to an object instance No valid data Generic object Single-precision floating-point value Character string value Variant array Unknown object type If you pass an array of a particular data type to TypeName, the same return string is used for the underlying data type of the array, suffixed with “()” to denote an array.

The Structure of a VB Program Any VB program—whether a hosted VBA application or a VB executable—is a collection of modules containing code, graphical user interface objects, and classes. This book concentrates on the language elements of VBA as they relate to both hosted VBA and the retail version of VB. The VBA and VB user interfaces— whether Word, Excel, Project, or a VB form—all fire events that are handled by the code you create using the VBA language. Therefore the code modules within your program are of greatest concern to us here.

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VB and VBA in a Nutshell: The Languages by Paul Lomax

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