QT use qzxing to generate QR code

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Update time ：2022-06-21

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Two dimensional code is also called two dimensional barcode , Common QR codes are QR Code,QR Full name Quick Response, It is a super popular coding method on mobile devices in recent years , It's better than the traditional Bar Code Barcode can store more information , Can also represent more data types .
Two dimensional bar code / QR code （2-dimensional bar code） It is to use a specific geometric figure in a plane according to a certain rule （ Two dimensional ） The distribution of the 、 Black and white 、 Graph recording data symbol information ; In code making, it is ingenious to use the “0”、“1” The concept of bitstream , A number of geometric shapes corresponding to binary are used to represent literal numerical information , Through image input device or photoelectric scanning device to read automatically to achieve automatic information processing ： It has some common features of bar code technology ： Each code system has its own specific character set ; Each character has a certain width ; It has certain verification function, etc . At the same time, it also has the function of automatic identification of different information 、 And processing the rotation change point of the graph .

Often applied to ：
● information acquisition （ Business card 、 Map 、WIFI password 、 Information ）
● Website jump （ Jump to Weibo 、 Mobile website 、 Website ）
● Advertising push （ User scan code , Browse the videos pushed by the merchants directly 、 Audio advertising ）
● Mobile e-commerce （ User scan code 、 Mobile phone direct shopping order ）
● Anti counterfeiting tracing （ User scan code 、 You can see the place of production ; At the same time, the backstage can obtain the final consumption place )
● Special promotion （ User scan code , Download e-coupons , Luck draw ）
● Member management （ Get e-member information on the user's mobile phone 、VIP service ）
● Mobile payment （ Scan product QR code , Pay through the mobile channel provided by bank or third party payment ）
● To login （ Scan QR code to log in each website or software ）

Reference resources ：
qt Generate qr code
qzxing Download address ：
https://github.com/ftylitak/qzxing

Add... After downloading scr file
Because the source code is in this file , So import this file .

pro File to add pri file .

include(qzxing/qzxing.pri)
Here I put src The file name is changed to Oh qzxing

QR code usage - Encoding and decoding

Add header file .
#include “qzxing/QZXing.h”

Code ：

    // code 
    QImage img = QZXing::encodeData("https://blog.csdn.net/weixin_44353958",QZXing::EncoderFormat_QR_CODE);
    ui->label_4->setPixmap(QPixmap::fromImage(img));
    ui->label_4->setScaledContents(true);// The adaptive 

    // decode 
    // QZXing decoder;
    // //mandatory settings
    // decoder.setDecoder( QZXing::DecoderFormat_QR_CODE | QZXing::DecoderFormat_EAN_13 );

    // //optional settings
    // //decoder.setSourceFilterType(QZXing::SourceFilter_ImageNormal | QZXing::SourceFilter_ImageInverted);
    // decoder.setSourceFilterType(QZXing::SourceFilter_ImageNormal);
    // decoder.setTryHarderBehaviour(QZXing::TryHarderBehaviour_ThoroughScanning |
    // QZXing::TryHarderBehaviour_Rotate);

    // //trigger decode
    // QString result = decoder.decodeImage(img);
    // qDebug()<<"result"<<result;