: Converting your text string into a binary stream, adding error correction bits (Reed-Solomon), and arranging them into a matrix grid.
Integration and deployment
SavePicture picQRCode.Image, "C:\GeneratedQRCodes\qrcode.bmp" Use code with caution. vb6 qr code generator source code
This code uses a UserControl or a standard Form with a PictureLink to fetch and display the QR code image. 1. Setup the Form Open VB6 and create a project. Add a TextBox ( txtData ) for the input text.
You can simply set the Picture property of an Image control to a URL. Sample URL: https://qrserver.com : Converting your text string into a binary
Sub Main() Dim text As String: text = "https://www.example.com" Dim filename As String: filename = "example_qr_code.png"
Option Explicit ' Windows API Declarations for graphical rendering Public Declare Function SetPixelV Lib "gdi32" (ByVal hDC As Long, ByVal x As Long, ByVal y As Long, ByVal crColor As Long) As Long Public Declare Function StretchBlt Lib "gdi32" (ByVal hdcDest As Long, ByVal nXOriginDest As Long, ByVal nYOriginDest As Long, ByVal nWidthDest As Long, ByVal nHeightDest As Long, ByVal hdcSrc As Long, ByVal nXOriginSrc As Long, ByVal nYOriginSrc As Long, ByVal nWidthSrc As Long, ByVal nHeightSrc As Long, ByVal dwRop As Long) As Long Public Const SRCCOPY As Long = &HCC0020 ' Simple structure to hold Matrix Data Public Type QRCodeMatrix Width As Long Data() As Byte End Type ' High-performance native rendering function Public Sub RenderQRCode(ByRef PicBox As PictureBox, ByRef Matrix As QRCodeMatrix, ByVal PixelScale As Long) Dim x As Long, y As Long Dim color As Long Dim matrixIndex As Long ' Clear the PictureBox PicBox.Cls ' Resize PictureBox to fit the QR code precisely PicBox.Width = PicBox.ScaleX((Matrix.Width * PixelScale), vbPixels, PicBox.Container.ScaleMode) PicBox.Height = PicBox.ScaleY((Matrix.Width * PixelScale), vbPixels, PicBox.Container.ScaleMode) ' Draw the matrix modules For y = 0 To Matrix.Width - 1 For x = 0 To Matrix.Width - 1 ' Check if module is black (1) or white (0) matrixIndex = (y * Matrix.Width) + x If Matrix.Data(matrixIndex) = 1 Then color = vbBlack Else color = vbWhite End If ' Draw scaled block using native VB6 Line method for speed PicBox.Line (x * PixelScale, y * PixelScale)-((x + 1) * PixelScale, (y + 1) * PixelScale), color, BF Next x Next y ' Refresh the control to display changes PicBox.Refresh End Sub Use code with caution. Step 3: Form Code Integration You can simply set the Picture property of
Private Sub Command1_Click() Dim qrPicture As StdPicture Set qrPicture = QRCodegenBarcode("https://vb6.com", 300, 300) Set Image1.Picture = qrPicture End Sub
Explain how to without compromising the QR code's aspect ratio.