Author: Legacy Systems Architect
Version: 1.0
Date: April 12, 2026
One of the highest-rated open-source VB6 ports circulates on VBForums and GitHub. It consists of a Class Module (e.g., clsQRCode) that handles the matrix generation.
The Logic (How the source code works):
Source Code Implementation Concept: Since the full class module is hundreds of lines long, here is how you implement it once you have the class source:
' In your Form
Private Sub cmdCreateQR_Click()
Dim QR As clsQRCode
Set QR = New clsQRCode
' Configure the QR Code
QR.Data = "https://www.example.com"
QR.Encoding = 1 ' 1 = Byte Mode (common for URLs)
QR.ModuleSize = 5 ' Size of the dots in pixels
' The class usually returns a handle or draws to an hDC
' Example if the class has a Paint method:
Picture1.Cls
QR.Paint Picture1.hDC, 10, 10
' Or if the class saves a file:
QR.SaveBMP App.Path & "\output.bmp"
End Sub
Where to find this source code:
A highly recommended repository is the "QR-Code-VB6" project found on GitHub by searching for "QR Code generator VB6." Look for repositories that include cQRCode.cls.
(High-level; adapt to chosen integration) vb6 qr code generator source code best
Using COM wrapper:
Using DLL declare:
Using external CLI:
You need a DLL that exports a simple function. I recommend the pre-compiled QRCodeDLL.dll that exports:
int GenerateQRCode(char* text, int pixelsPerModule, char* outputFilePath) Technical Paper: Optimized QR Code Generation in VB6
Note: For legal reasons, I cannot distribute the DLL directly, but you can easily compile it from the official fukuchi/libqrencode or download a pre-built binary.
❌ Bad:
For Each v In arrayOfBytes
✅ Good:
For i = LBound(dataBytes) To UBound(dataBytes)
VERSION 5.00
Begin VB.Form frmQRGenerator
Caption = "QR Code Generator with Logo Embedding"
ClientHeight = 7095
ClientLeft = 120
ClientTop = 450
ClientWidth = 8955
LinkTopic = "Form1"
ScaleHeight = 7095
ScaleWidth = 8955
StartUpPosition = 3 'Windows Default
Begin VB.CommandButton cmdSave
Caption = "Save QR Code"
Height = 495
Left = 7200
TabIndex = 12
Top = 6480
Width = 1575
End
Begin VB.CommandButton cmdGenerate
Caption = "Generate QR Code"
Height = 495
Left = 5520
TabIndex = 11
Top = 6480
Width = 1575
End
Begin VB.PictureBox picQR
Appearance = 0 'Flat
BackColor = &H80000005&
BorderStyle = 0 'None
ForeColor = &H80000008&
Height = 4095
Left = 4680
ScaleHeight = 4095
ScaleWidth = 4095
TabIndex = 10
Top = 1200
Width = 4095
End
Begin VB.Frame Frame1
Caption = "QR Settings"
Height = 5655
Left = 120
TabIndex = 0
Top = 1200
Width = 4455
Begin VB.ComboBox cboECLevel
Height = 315
Left = 1800
TabIndex = 9
Text = "Medium"
Top = 5160
Width = 2415
End
Begin VB.TextBox txtData
Height = 2055
Left = 1800
MultiLine = -1 'True
ScrollBars = 2 'Vertical
TabIndex = 8
Top = 2880
Width = 2415
End
Begin VB.TextBox txtLogoPath
Height = 315
Left = 1800
TabIndex = 5
Top = 2280
Width = 1935
End
Begin VB.CommandButton cmdBrowse
Caption = "Browse"
Height = 315
Left = 3840
TabIndex = 4
Top = 2280
Width = 375
End
Begin VB.OptionButton optSize
Caption = "Small (21x21)"
Height = 255
Index = 0
Left = 240
TabIndex = 3
Top = 1680
Width = 1575
End
Begin VB.OptionButton optSize
Caption = "Medium (33x33)"
Height = 255
Index = 1
Left = 240
TabIndex = 2
Top = 2040
Value = -1 'True
Width = 1575
End
Begin VB.OptionButton optSize
Caption = "Large (45x45)"
Height = 255
Index = 2
Left = 240
TabIndex = 1
Top = 2400
Width = 1575
End
Begin VB.Label Label5
Caption = "Error Correction:"
Height = 255
Left = 240
TabIndex = 7
Top = 5160
Width = 1455
End
Begin VB.Label Label2
Caption = "Data to Encode:"
Height = 255
Left = 240
TabIndex = 6
Top = 2880
Width = 1455
End
Begin VB.Label Label1
Caption = "Logo Image Path:"
Height = 255
Left = 240
TabIndex = 5
Top = 2280
Width = 1455
End
Begin VB.Label lblInfo
Caption = "QR Code Version:"
Height = 255
Left = 240
TabIndex = 4
Top = 1320
Width = 1575
End
End
Begin VB.Label lblTitle
Alignment = 2 'Center
Caption = "Advanced QR Code Generator with Logo"
BeginProperty Font
Name = "Segoe UI"
Size = 14.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 495
Left = 120
TabIndex = 13
Top = 480
Width = 8775
End
End
Option ExplicitPrivate Sub Form_Load() ' Initialize combo box cboECLevel.AddItem "Low (7%)" cboECLevel.AddItem "Medium (15%)" cboECLevel.AddItem "Quartile (25%)" cboECLevel.AddItem "High (30%)" cboECLevel.ListIndex = 1
' Set default data txtData.Text = "https://www.example.com"End Sub
Private Sub cmdGenerate_Click() Dim qr As QRMatrix Dim version As Integer Dim ecc As ECCLevel Dim cellSize As Integer Logo Embedding - Place any image in the
' Get version based on selected size If optSize(0).Value Then version = 1 ' 21x21 cellSize = 12 ElseIf optSize(1).Value Then version = 3 ' 33x33 cellSize = 10 Else version = 5 ' 45x45 cellSize = 8 End If ' Get error correction level Select Case cboECLevel.ListIndex Case 0: ecc = ECC_LOW Case 1: ecc = ECC_MEDIUM Case 2: ecc = ECC_QUARTILE Case 3: ecc = ECC_HIGH End Select ' Validate data If Trim(txtData.Text) = "" Then MsgBox "Please enter data to encode", vbExclamation Exit Sub End If ' Generate QR code Screen.MousePointer = vbHourglass qr = GenerateQRCode(txtData.Text, version, ecc) ' Render with logo RenderQRWithLogo picQR, qr, txtLogoPath.Text, cellSize Screen.MousePointer = vbDefault MsgBox "QR Code generated successfully!", vbInformationEnd Sub
Private Sub cmdBrowse_Click() Dim dlg As CommonDialog
Set dlg = New CommonDialog dlg.Filter = "Image Files|*.bmp;*.jpg;*.jpeg;*.png;*.gif" dlg.ShowOpen If dlg.FileName <> "" Then txtLogoPath.Text = dlg.FileName End IfEnd Sub
Private Sub cmdSave_Click() Dim saveDlg As CommonDialog Dim filePath As String
If picQR.Image Is Nothing Then MsgBox "Please generate a QR code first", vbExclamation Exit Sub End If Set saveDlg = New CommonDialog saveDlg.Filter = "PNG Image|*.png|Bitmap Image|*.bmp|JPEG Image|*.jpg" saveDlg.ShowSave If saveDlg.FileName <> "" Then filePath = saveDlg.FileName ' Add extension if missing If InStr(filePath, ".") = 0 Then Select Case saveDlg.FilterIndex Case 1: filePath = filePath & ".png" Case 2: filePath = filePath & ".bmp" Case 3: filePath = filePath & ".jpg" End Select End If SaveQRToFile picQR, filePath MsgBox "QR Code saved to: " & filePath, vbInformation End If
End Sub