Public Sub DrawQRMatrix(ByRef Matrix() As Byte, ByVal picBox As PictureBox) Dim x As Integer, y As Integer Dim matrixSize As Integer Dim scaleFactor As Single matrixSize = UBound(Matrix, 1) ' Clear the PictureBox picBox.Cls picBox.AutoRedraw = True picBox.ScaleMode = vbPixels ' Calculate module size based on PictureBox dimensions scaleFactor = picBox.ScaleWidth / (matrixSize + 1) ' Draw the black and white squares For y = 0 To matrixSize For x = 0 To matrixSize If Matrix(x, y) = 1 Then ' Draw black module picBox.Line (x * scaleFactor, y * scaleFactor)-Step(scaleFactor, scaleFactor), vbBlack, BF Else ' Draw white module picBox.Line (x * scaleFactor, y * scaleFactor)-Step(scaleFactor, scaleFactor), vbWhite, BF End If Next x Next y ' Refresh storage memory picBox.Refresh End Sub Use code with caution. Best Practices for QR Codes in Legacy Systems
Private Sub Command1_Click() ' Create a new instance of the QR Code Generator ActiveX Control Dim qrCode As New QRCodeLib.QRCode
Private Sub GenerateCloudQR(ByVal TargetText As String) Dim Http As New MSXML2.XMLHTTP60 Dim URL As String Dim EncodedText As String Dim FileNum As Integer Dim ImageBytes() As Byte ' Simple URL Encoding for space characters EncodedText = Replace(TargetText, " ", "%20") ' Construct API URL (Size: 200x200) URL = "https://googleapis.com" & EncodedText ' Send Request Http.Open "GET", URL, False Http.send If Http.Status = 200 Then ImageBytes = Http.responseBody ' Write binary data to temporary file FileNum = FreeFile Open App.Path & "\temp_qr.png" For Binary Access Write As #FileNum Put #FileNum, , ImageBytes Close #FileNum ' Display image (Requires GDI+ for PNG, or standard BMP conversion) Set picQRCode.Picture = LoadPicture(App.Path & "\temp_qr.png") End If End Sub Use code with caution. Method 3: Using a WebBrowser Control & JavaScript qr code in vb6
Timer1.Enabled = False outPath = Timer1.Tag
The system spits out a crisp .png file. It’s reliable, but it requires installing extra software on every machine in the warehouse. Path 2: The Cloud Bridge (The API Route) Public Sub DrawQRMatrix(ByRef Matrix() As Byte, ByVal picBox
Private Sub GenerateNativeQR() Dim qr As New clsQRCode ' Set error correction level: L (7%), M (15%), Q (25%), H (30%) qr.ErrorCorrectionLevel = "M" ' Encode the data string qr.Encode "Hello World from VB6!" ' Clear the picture box Picture1.Cls Picture1.AutoRedraw = True ' Draw the QR code using the class visual matrix ' Note: Exact syntax depends on the specific open-source class library used qr.Draw Picture1.hdc, 10, 10, 4 ' Target hDC, X, Y, Module Size Picture1.Refresh End Sub Use code with caution. Method 3: Using a COM-Registered DLL or ActiveX Control
Generate QR codes with various data lengths and test them with different scanning devices to ensure proper encoding and readability. Test on different Windows versions, as VB6 applications rely on the VB6 runtime ( msvbvm60.dll ), which may not be present by default on modern operating systems. It’s reliable, but it requires installing extra software
Integrating QR Codes in Visual Basic 6 (VB6) Integrating QR codes into Visual Basic 6 (VB6) remains a highly requested feature for legacy desktop applications. Businesses continue to rely on VB6 for inventory tracking, ticketing, and invoicing. Adding QR code generation modernizes these systems without requiring a complete rewrite of the software.
: Add the module to your project and call QRCodegenBarcode to generate a vector-based StdPicture .
True VB6 GDI operations are slow and error-prone. For production, avoid this method.