Lesson 38: Keyboard Handling in VB6

Welcome to Lesson 38 of our Visual Basic 6 Tutorial! In this lesson, you'll learn how to handle keyboard events in VB6 using KeyPress, KeyDown, and KeyUp events to create responsive applications that react to user input.

38.1 Understanding Keyboard Events

VB6 provides three keyboard events to handle user input:

Keyboard Event Sequence

When a key is pressed, events fire in this order:

1. KeyDown - When key is first pressed
2. KeyPress - When character is generated
3. KeyUp - When key is released

38.2 ASCII and Key Constants

Keyboard events use ASCII values to identify keys. ASCII (American Standard Code for Information Interchange) assigns numeric values to characters.

Common ASCII Values

38.3 Writing Keyboard Event Handlers

Let's explore practical examples of keyboard event handling in VB6.

Example 38.1: Detecting the Enter Key

This code detects when the Enter key is pressed:

Private Sub Form_KeyPress(KeyAscii As Integer)
    If KeyAscii = 13 Then ' 13 is ASCII for Enter
        Print "You pressed the Enter key"
    Else
        Print "You pressed: " & Chr(KeyAscii)
    End If
End Sub
                        

Example 38.2: Displaying Pressed Keys

This simple handler shows each key pressed:

Private Sub Form_KeyPress(KeyAscii As Integer)
    Print Chr(KeyAscii) ' Convert ASCII to character
End Sub
                        

Example 38.3: Using Key Constants

Using constants makes your code more readable:

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
    If KeyCode = vbKeyF1 Then ' Show help when F1 is pressed
        MsgBox "Help information goes here", vbInformation
    End If
    
    If KeyCode = vbKeyEscape Then ' Exit on Escape
        Unload Me
    End If
End Sub
                        

Example 38.4: Detecting Modifier Keys

The Shift parameter lets you detect Ctrl, Alt, and Shift combinations:

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
    ' Check for Ctrl+S combination
    If KeyCode = vbKeyS And Shift = vbCtrlMask Then
        SaveFile
        ' Prevent default behavior
        KeyCode = 0
    End If
    
    ' Check for Alt+F4 combination
    If KeyCode = vbKeyF4 And Shift = vbAltMask Then
        Unload Me
        KeyCode = 0
    End If
End Sub
                        

Next Lesson

Continue your VB6 journey with Lesson 39: Printing.

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