Qr Code In Vb6 May 2026

' Generate QR code for different data types Private Sub GenerateContactQRCode(ByVal Name As String, ByVal Phone As String, ByVal Email As String) Dim vCard As String vCard = "BEGIN:VCARD" & vbCrLf & _ "VERSION:3.0" & vbCrLf & _ "FN:" & Name & vbCrLf & _ "TEL:" & Phone & vbCrLf & _ "EMAIL:" & Email & vbCrLf & _ "END:VCARD" GenerateQRCode_API vCard, 400 End Sub

' Generate WiFi QR code Private Sub GenerateWiFiQRCode(ByVal SSID As String, ByVal Password As String, ByVal Encryption As String) Dim wifiString As String wifiString = "WIFI:S:" & SSID & ";T:" & Encryption & ";P:" & Password & ";;" GenerateQRCode_API wifiString, 350 End Sub

If you cannot install DLLs on the target machine (e.g., locked-down industrial PC), call a free web API.

For the adventurous: you can implement a QR code generator entirely in VB6 by drawing bitmaps manually. This is complex because QR standards (ISO 18004) require:

On your development machine (or deployment PC), register the DLL using: qr code in vb6

regsvr32 QRCodeGen.dll

Concept: POST text to a QR-generation REST API (or build a small internal HTTP microservice) and receive PNG/SVG. Use XMLHTTP or WinHTTP to call API, then save and display the returned image.

VB6 example (basic using MSXML2.ServerXMLHTTP):

Private Sub GenerateQRCode_WebAPI(text As String, outPath As String)
    Dim http As Object
    Set http = CreateObject("MSXML2.ServerXMLHTTP")
    Dim url As String
    url = "https://api.qrserver.com/v1/create-qr-code/?size=300x300&data=" & URLEncode(text)
    http.Open "GET", url, False
    http.Send
    If http.Status = 200 Then
        Dim ado As Object
        Set ado = CreateObject("ADODB.Stream")
        ado.Type = 1 'binary
        ado.Open
        ado.Write http.responseBody
        ado.SaveToFile outPath, 2
        ado.Close
        PictureBox1.Picture = LoadPicture(outPath)
    Else
        MsgBox "HTTP error: " & http.Status
    End If
End Sub
' Minimal URL-encode helper
Private Function URLEncode(s As String) As String
    Dim i As Long, ch As String, code As String
    For i = 1 To Len(s)
        ch = Mid$(s, i, 1)
        Select Case Asc(ch)
        Case 48 To 57, 65 To 90, 97 To 122, 45, 46, 95, 126
            URLEncode = URLEncode & ch
        Case Else
            code = Hex$(Asc(ch))
            If Len(code) = 1 Then code = "0" & code
            URLEncode = URLEncode & "%" & code
        End Select
    Next
End Function

Notes:

Another option is to use the free QRCode.com DLL (by MW6 Technologies’ legacy freeware). The method is similar: reference the DLL and call CreateQRCode.

Dim QR As New QRCodeLib.QRCode
Picture1.Picture = QR.Create("DATA", 4)  ' 4 = error correction level

Martin leaned back in his worn-out office chair, the springs groaning in protest. Outside his window, the neon lights of Singapore’s financial district painted the rain-slicked streets in hues of electric blue and magenta. Inside his cubicle, however, the aesthetic was strictly 1999. The monitor glowed with the familiar, comforting teal interface of Microsoft Visual Basic 6.0. ' Generate QR code for different data types

“Legacy systems don’t die,” Martin muttered, sipping his third cup of kopi. “They just find new people to haunt.”

He was the Keeper of the Inventory. For twenty-three years, the Port of Singapore Authority had relied on his VB6 application—Invntrak.exe—to track forty thousand shipping containers. It was a masterpiece of ancient engineering: a labyrinth of MSFlexGrid controls, WinSock controls for serial communication with weighbridges, and a custom DLL written in C that nobody had the source code for anymore.

But today, a new memo circulated down from the 40th floor. “Digital Transformation Initiative: Phase 4.”

His manager, a fresh-faced 28-year-old named Kelvin who wore sneakers to board meetings, delivered the news. “Martin, we’re integrating the new logistics API. All yard checks will now use QR codes.”

Martin blinked. “QR codes? Like the pizza menu?” End Sub ' Generate WiFi QR code Private

Kelvin laughed nervously. “Exactly. The crane operators scan the container code with a handheld scanner. It sends a string. We need Invntrak to read it.”

“My system reads barcodes. Classic UPC. This… square maze thing?”

“It’s just data, Martin,” Kelvin said, already backing out of the cubicle. “Figure it out. The API documentation is on SharePoint.”

SharePoint. Martin didn’t even know what that was.

Private Sub GenerateQRCode_WebAPI(text As String, outPath As String) Dim http As Object Set http = CreateObject("MSXML2.ServerXMLHTTP") Dim url As String url = "https://api.qrserver.com/v1/create-qr-code/?size=300x300&data=" & URLEncode(text) http.Open "GET", url, False http.Send If http.Status = 200 Then Dim ado As Object Set ado = CreateObject("ADODB.Stream") ado.Type = 1 'binary ado.Open ado.Write http.responseBody ado.SaveToFile outPath, 2 ado.Close PictureBox1.Picture = LoadPicture(outPath) Else MsgBox "HTTP error: " & http.Status End If End Sub ' Minimal URL-encode helper Private Function URLEncode(s As String) As String Dim i As Long, ch As String, code As String For i = 1 To Len(s) ch = Mid$(s, i, 1) Select Case Asc(ch) Case 48 To 57, 65 To 90, 97 To 122, 45, 46, 95, 126 URLEncode = URLEncode & ch Case Else code = Hex$(Asc(ch)) If Len(code) = 1 Then code = "0" & code URLEncode = URLEncode & "%" & code End Select Next End Function