cQRcode QR Code Component Overview

Introduction

cQRcode is a QR code generation component based on Nayuki's QR Code Generator Library (MIT License). Supports generating standard QR code images with customizable content, size, and colors.

Features

Feature	Description
Pure VB Implementation	No external dependencies
Chainable API	Fluent API design
Error Correction Levels	Supports L/M/Q/H four-level error correction
Auto Encoding	Supports numeric, alphanumeric, byte multiple modes
Clipboard Output	Supports direct copy to clipboard
Image Return	Returns StdPicture object, can display directly

Error Correction Levels

Level	Constant	Error Tolerance	Use Case
L	QRCodegenEcc_LOW	~7%	Clean environment
M	QRCodegenEcc_MEDIUM	~15%	General scenarios
Q	QRCodegenEcc_QUARTILE	~25%	Some damage
H	QRCodegenEcc_HIGH	~30%	Severe damage

Quick Start

Basic Usage

Dim QR As New cQRcode

' Simple generation
Set Image1.Picture = QR.Generate()

Chainable Settings

Dim QR As New cQRcode

' Chainable call to set properties and generate
Set Image1.Picture = QR _
    .SetText("https://www.vb6.pro") _
    .SetSize(200) _
    .SetForeColor(vbBlue) _
    .Generate()

Copy to Clipboard

Dim QR As New cQRcode

' Generate and copy to clipboard
QR.SetText("Hello World").Generate True

' Now can paste to other applications

Save as Image File

Dim QR As New cQRcode

' Generate and save
Set QR.Picture = QR.SetText("Save me!").Generate()
SavePicture QR.Picture, App.Path & "\qrcode.bmp"

File Structure

File	Description
cQRcode.cls	QR code class with simple interface
mQRcodeGen.bas	Core generation algorithm module

Low-level Functions (Advanced Usage)

For more fine-grained control, you can directly use module functions:

' Directly use low-level functions
Set Picture1.Picture = QRCodegenBarcode( _
    TextOrByteArray:="Hello", _
    clrFore:=vbBlack, _
    Ecl:=QRCodegenEcc_MEDIUM, _
    MinVersion:=1, _
    MaxVersion:=5, _
    Mask:=QRCodegenMask_AUTO, _
    BoostEcl:=True, _
    PicSize:=300 _
)

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Last Updated: 2026-05-17