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INTRODUCING VISUAL BASIC ...................................................................................... 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 What is Visual Basic .................................................................................................... 1 Events and Event Procedures ........................................................................................ 1 Object-Related Concepts ............................................................................................... 1 The Visual Basic Program Development Process ......................................................... 2 Required Computer Skills ............................................................................................. 3 Logical Program Organization ...................................................................................... 3 Visual Basic Program Components ............................................................................... 3 The Visual Basic Environment ...................................................................................... 4 Opening an Existing Visual Basic Project ..................................................................... 8 Saving a Visual Basic Project ........................................................................................ 8 Running a Visual Basic Project ..................................................................................... 8 Getting Help .................................................................................................................. 9 A Sample Visual Basic Project ...................................................................................... 9
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VISUAL BASIC FUNDAMENTALS ................................................................................ 18 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 Numeric Constants ...................................................................................................... 18 String Constants ........................................................................................................... 19 Variables ..................................................................................................................... 19 Data Types and Data Declarations ............................................................................... 20 Operators and Expressions .......................................................................................... 22 Hierarchy of Operations .............................................................................................. 24 Inserting Parentheses ................................................................................................... 24 Special Rules Concerning Numeric Expressions ......................................................... 25 String Expressions ....................................................................................................... 26 Assigning Values to Variables ..................................................................................... 26 Displaying Output The Print Statement .................................................................... 28 Library Functions ........................................................................................................ 29 Program Comments ..................................................................................................... 31
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BRANCHING AND LOOPING ........................................................................................ 38 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Relational Operators and Logical Expressions ............................................................ 38 Logical Operators ........................................................................................................ 39 Branching with the If-Then Block ............................................................................... 41 Branching with If-Then-Else Blocks ........................................................................... 41 Selection: Select Case .................................................................................................. 44 Looping with For-Next ................................................................................................ 47 Looping with Do-Loop ................................................................................................ 49 Looping with While-Wend .......................................................................................... 51 The Stop Statement ..................................................................................................... 52
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VISUAL BASIC CONTROL FUNDAMENTALS ........................................................... 58 4.1 4.2 4.3 4.4 Visual Basic Control Tools ......................................................................................... 58 Control Tool Categories .............................................................................................. 61 Working with Controls ................................................................................................ 61 Naming Forms and Controls ........................................................................................ 61
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4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15
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Assigning Property Values to Forms and Controls ...................................................... 62 Executing Commands (Event Procedures and Command Buttons) ............................. 63 Displaying Output Data (Labels and Text Boxes) ....................................................... 64 Entering Input Data (Text Boxes) ............................................................................... 68 Selecting Multiple Features (Check Boxes) ................................................................ 74 Selecting Exclusive Alternatives (Option Buttons and Frames) .................................. 77 Selecting from a List (List Boxes and Combo Boxes) ................................................. 85 Assigning Properties Collectively (The With Block) ................................................... 90 Generating Error Messages (The MsgBox Function) .................................................. 92 Creating Timed Events (The Timer Control) .............................................................. 96 Scroll Bars ................................................................................................................... 98
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MENUS AND DIALOG BOXES ..................................................................................... 109 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 Building Drop-Down Menus ..................................................................................... 109 Accessing a Menu from the Keyboard ....................................................................... 112 Menu Enhancements .................................................................................................. 117 Submenus .................................................................................................................. 119 Pop-Up Menus ........................................................................................................... 121 Dialog Boxes ............................................................................................................. 125 More about the MsgBox Function ............................................................................. 133 The InputBox Function .............................................................................................. 134
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EXECUTING AND DEBUGGING A NEW PROJECT ............................................... 143 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Syntactic Errors ......................................................................................................... 143 Logical Errors ............................................................................................................ 144 Setting Breakpoints ................................................................................................... 145 Defining Watch Values ............................................................................................. 146 Stepping through a Program ...................................................................................... 152 User-Induced Errors .................................................................................................. 155 Error Handlers ........................................................................................................... 155 Generating a Stand-Alone Executable Program ........................................................ 161
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PROCEDURES ................................................................................................................. 168 7.1 7.2 7.3 7.4 7.5 7.6 Modules and Procedures ........................................................................................... 168 Sub Procedures (Subroutines) ................................................................................... 168 Event Procedures ....................................................................................................... 175 Function Procedures .................................................................................................. 177 Scope ......................................................................................................................... 184 Optional Arguments .................................................................................................. 195
ARRAYS ............................................................................................................................ 204 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 Array Characteristics ................................................................................................. 204 Array Declarations ..................................................................................................... 205 Processing Array Elements (Subscripted Variables) ................................................. 207 Passing Arrays to Procedures .................................................................................... 211 Dynamic Arrays ......................................................................................................... 221 Array-Related Functions ............................................................................................ 225 Control Arrays ........................................................................................................... 226 Looping with For Each-Next ..................................................................................... 236
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DATA FILES ..................................................................................................................... 247 9.1 9.2 9.3 9.4 9.5 9.6 Data File Characteristics ............................................................................................ 247 Accessing and Saving a File in Visual Basic: The Common Dialog Control ............ 247 Processing a Data File ............................................................................................... 251 Sequential Data Files (Text Files) ............................................................................. 252 Random Access (Direct) Data Files .......................................................................... 274 Binary Files ............................................................................................................... 290
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