Book Image

Visual Basic Quickstart Guide

By : Aspen Olmsted
Book Image

Visual Basic Quickstart Guide

By: Aspen Olmsted

Overview of this book

Whether you’re an absolute beginner or an experienced developer looking to learn the Visual Basic language, this book takes a hands-on approach to guide you through the process. From the very first chapters, you'll delve into writing programs, exploring core concepts such as data types, decision branching, and iteration. Additionally, you’ll get to grips with working with data structures, file I/O, and essential object-oriented principles like inheritance and polymorphism. This book goes beyond the basics to equip you with the skills to read and write code across the entire VB family, spanning VB Script, VBA, VB Classic, and VB.NET, enabling you to handle legacy code maintenance with ease. With clear explanations, practical examples, and hands-on exercises, this book empowers you to tackle real-world software development tasks, whether you're enhancing existing projects or embarking on new ones. It addresses common challenges like distinguishing between the variations of the VB programming language to help you choose the right one for your projects. Don't let VB's extensive legacy daunt you; embrace it with this comprehensive guide that equips you with practical, up-to-date coding skills to overcome the challenges presented by Visual Basic's rich history of over two decades.
Table of Contents (27 chapters)
Free Chapter
1
Part 1:Visual Basic Programming and Scripting
9
Part 2:Visual Basic Files and Data Structures
14
Part 3:Object-Oriented Visual Basic
20
Part 4:Server-Side Development

Building the project in VBA

What follows is a Visual Basic for Applications (VBA) application that defines a subroutine named ReadCSVFile that reads a CSV file containing student names and grades. Let’s break down the code:

  1. Sub ReadCSVFile(): This line starts the definition of the ReadCSVFile subroutine. It indicates that it doesn’t return any value.
  2. These lines declare several variables used in the subroutine:
       Dim fso As Object
       Dim inputFile As Object
       Dim studentGrades As Object
       Dim line As String
       Dim fields() As String
       Dim studentName As String
       Dim grade As String
       Dim grades() As String
       Dim gradeList As String
    1. fso, inputFile, and studentGrades are declared as generic Object types and will be assigned to specific objects later.
    2. line, fields(), studentName, grade, grades(), and gradeList are declared...