Vb6 Qr Code Generator Source Code [NEW]

Dim qr As New QRCodeGenerator
qr.ErrorCorrection = ecM  ' M (~15% recovery)
qr.InputMode = modeAlphaNum
qr.Data = "https://vb6legacy.com"
qr.RenderToPictureBox Picture1, 4  ' 4 pixels per module

Result: Scannable, but only with modern phone cameras tilted just right. Older scanners (e.g., Symbol LS2208) often fail.

| Test Input | Expected Result | Observed Result | |------------|----------------|------------------| | "12345678" | Numeric QR, Version 1 | Pass – decodes with any standard reader | | "HELLO" | Alphanumeric QR | Pass | | "https://vb6.com" | Byte mode, Version 2+ | Pass |

Decoder used for validation: ZXing library (external, only for testing).

To use this code, create a new project in VB6, add a Class Module named clsQRCode, and paste the following code.

' Module: modQR.Bas
Public Declare Function QR_EncodeString Lib "qrencode.dll" _
(ByVal str As String, ByVal outFile As String, ByVal scale As Long) As Boolean
Public Sub GenerateQRFromDLL(data As String, saveAsBmp As String)
Dim result As Boolean
result = QR_EncodeString(data, saveAsBmp, 8)
If result Then
Picture1.Picture = LoadPicture(saveAsBmp)
Else
MsgBox "QR generation failed"
End If
End Sub
 vb6 qr code generator source code

You then need to have the qrencode.dll (compiled for 32-bit) in your app folder. This is the most professional approach but requires you to build the DLL yourself or find a precompiled version.

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The QR matrix is initialized with finder patterns, separators, timing patterns, and format info. Data is placed in a serpentine pattern (up/down columns).

Public Sub PlaceModules(matrix() As Integer, dataBits() As Byte)
    Dim x As Integer, y As Integer, direction As Integer
    ' Skip fixed patterns, then zig-zag
    ' Apply best mask (evaluates penalty scores)
End Sub

'========================================================================
' Module: clsQRCode
' Description: Minimalist QR Code Generator (Version 1, Byte Mode, EC L)
'              Adapted for VB6 from open source specifications.
'========================================================================
Option Explicit
' Error Correction Levels
Public Enum QR_ECL
    ECL_L = 0 ' 7%
    ECL_M = 1 ' 15%
    ECL_Q = 2 ' 25%
    ECL_H = 3 ' 30%
End Enum
' Private variables for the matrix
Private pMatrix() As Integer
Private pSize As Integer
' Public function to generate the matrix
' Returns a 2D integer array (0=White, 1=Black)
Public Function GenerateQR(ByVal Data As String) As Variant
    Dim bitStream() As Integer
    Dim byteData() As Byte
' 1. Convert string to byte array
    byteData = StrConv(Data, vbFromUnicode)
' 2. Create Bit Stream
    ' Mode Indicator (4 bits): 0100 (Byte Mode)
    ' Character Count (8 bits): Length of data
    ' Data: 8 bits per character
    ' Terminator: 0000
    Call CreateBitStream(byteData, bitStream)
' 3. Generate Matrix (21x21 for Version 1)
    pSize = 21
    ReDim pMatrix(pSize - 1, pSize - 1)
Call AddFinderPatterns
    Call AddTimingPatterns
    Call AddData(bitStream)
' Return the matrix as a Variant
    GenerateQR = pMatrix
End Function
' Private helpers
Private Sub CreateBitStream(Bytes() As Byte, ByRef Bits() As Integer)
    Dim i As Long, j As Long
    Dim bitLen As Long
    Dim byteVal As Integer
' Rough estimation of array size
    ' Mode(4) + Count(8) + Data(8*n) + Terminator(4) + Padding
    ReDim Bits(0) ' Dynamic resizing for simplicity in this demo
' Add Mode Indicator (0100)
    AddBits Bits, 4, 4
' Add Character Count (8 bits)
    AddBits Bits, UBound(Bytes) + 1, 8
' Add Data
    For i = 0 To UBound(Bytes)
        AddBits Bits, Bytes(i), 8
    Next i
' Add Terminator (0000)
    AddBits Bits, 0, 4
' Pad with 0s to fill capacity (Version 1-L = 152 bits data capacity approx)
    ' This simplified example truncates for brevity. In production, use specific padding bytes.
End Sub
Private Sub AddBits(ByRef Bits() As Integer, ByVal Value As Long, ByVal Count As Integer)
    Dim i As Integer
    Dim currentLen As Long
    currentLen = UBound(Bits)
For i = Count - 1 To 0 Step -1
        If currentLen >= 0 Then
            If currentLen > 0 Then ReDim Preserve Bits(currentLen)
            If ((Value \ (2 ^ i)) And 1) = 1 Then
                Bits(currentLen) = 1
            Else
                Bits(currentLen) = 0
            End If
            currentLen = currentLen + 1
        End If
    Next i
End Sub
Private Sub AddFinderPatterns()
    ' Top-Left
    DrawRect 0, 0, 7, 1
    DrawRect 0, 0, 1, 7
    DrawRect 0, 6, 7, 1
    DrawRect 6, 0, 1, 7
    DrawRect 2, 2, 3, 3
' Top-Right
    DrawRect 14, 0, 7, 1
    DrawRect 14, 0, 1, 7
    DrawRect 14, 6, 7, 1
    DrawRect 20, 0, 1, 7
    DrawRect 16, 2, 3, 3
' Bottom-Left
    DrawRect 0, 14, 7, 1
    DrawRect 0, 14, 1, 7
    DrawRect 0, 20, 7, 1
    DrawRect 6, 14, 1, 7
    DrawRect 2, 16, 3, 3
End Sub
Private Sub DrawRect(x As Integer, y As Integer, w As Integer, h As Integer)
    Dim i As Integer, j As Integer
    For i = x To x + w - 1
        For j = y To y + h - 1
            If i < pSize And j < pSize Then
                pMatrix(i, j) = 1 ' Black
            End If
        Next j
    Next i
End Sub
Private Sub AddTimingPatterns()
    ' Horizontal line between finder patterns
    Dim i As Integer
    For i = 8 To 12
        If i Mod 2 = 0 Then
            pMatrix(i, 6) = 1
        Else
            pMatrix(i, 6) = 0
        End If
    Next i
' Vertical line between finder patterns
    For i = 8 To 12
        If i Mod 2 = 0 Then
            pMatrix(6, i) = 1
        Else
            pMatrix(6, i) = 0
        End If
    Next i
End Sub
Private Sub AddData(Bits() As Integer)
    ' Simplified placement algorithm for demonstration
    ' In a full library, this handles masking, interweaving, and skipping reserved areas.
Dim bitIndex As Long
    Dim x As Integer, y As Integer
    Dim upward As Boolean
    upward = True
    x = pSize - 1 ' Start at bottom right
For bitIndex = 0 To UBound(Bits)
        ' Find next unreserved module
        Do While pMatrix(x, y) <> 0 ' Simplified check
             ' Logic for moving coordinates up/down and left is complex
             ' This is a placeholder for the actual zigzag placement logic
             y = y + 1
             If y >= pSize Then
                 y = 0
                 x = x - 1
             End If
             If x < 0 Then Exit Sub
        Loop
' Place bit
        pMatrix(x, y) = Bits(bitIndex)
    Next bitIndex
End Sub

| Criterion | Status (Example) | |-----------|------------------| | Standard compliance | ❌ No error correction | | Variable QR version | ❌ Fixed 21×21 | | Byte mode support | ✅ Yes | | Kanji mode | ❌ No | | Output as picture | ✅ PictureBox | | Performance < 0.5 sec for small QR | ⚠️ 1.2 sec | | Handles long text (> 50 chars) | ❌ Crashes |

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If you’d like, I can:

This is the most "native" way as it doesn't require installing third-party DLLs or an internet connection. You can use the VbQRCodegen library on GitHub, which is a single .bas file.

Add Library: Download and add mdQRCodegen.bas to your VB6 project. Usage Code:

' In your Form code Private Sub Command1_Click() ' Set the picture property of an Image control Set Image1.Picture = QRCodegenBarcode("Your Text Here") End Sub Use code with caution. Copied to clipboard

Tip: The returned picture is vector-based, so you can stretch it without losing quality. Method 2: Google Charts API (Easiest)

If your application has internet access, you can simply download an image from Google's API and display it in a PictureBox. Code Snippet: Dim qr As New QRCodeGenerator qr

Private Sub GenerateQR(Text As String) Dim url As String url = "https://googleapis.com" & Text ' Use an async download method or a Control that supports URL loading ' Example using a simple WebBrowser control or direct download: WebBrowser1.Navigate url End Sub Use code with caution. Copied to clipboard

Note: While easy, this method depends on Google's external service. Method 3: ActiveX Controls (SDKs)

For professional or enterprise use, many developers use SDKs like ByteScout BarCode SDK which provides more control over error correction and formatting.

Installation: Install the SDK and register the ActiveX component via Project -> Components in the VB6 menu. Example Source Code:

Dim bc As Object Set bc = CreateObject("Bytescout.BarCode.Barcode") ' 16 corresponds to QR Code symbology in this SDK bc.Symbology = 16 bc.Value = "https://example.com" ' Save as image file bc.SaveImage "C:\QRCode.png" ' Or draw directly to a Form's Device Context (hDC) bc.DrawToFormHDC Me.hDC, 10, 10, 100, 100 Set bc = Nothing Use code with caution. Copied to clipboard Summary Comparison Table Internet Required Deployment Complexity Customisation Pure .bas Low (Single file) Google API ActiveX SDK High (Requires DLL reg) wqweto/VbQRCodegen: QR Code generator library for VB6/VBA Result: Scannable, but only with modern phone cameras