The QR code can store all kinds of information, mainly including:

Website, business card, short message, specific code.

According to the application mode of information, it can be divided into:

1, apply online

For example, web addresses and specific codes are more online applications.

2. Offline applications

For example, SMS and business cards are more offline applications.

What can a QR code contain?

It can include numbers, Chinese characters and so on. I wrote this when I generated Erdan code myself.

You can refer to google's zxing to generate an example of QR code.

What is a QR code and what is its principle?

The answer is as follows:

Two-dimensional code ui is a kind of two-dimensional code, which is different from the traditional one-dimensional code (such as bar code on goods). Two-dimensional code stores information in both horizontal and vertical directions, so the information capacity is greatly improved. QR code? It is a registered trademark of Denso Wave Company.

What are QR codes and mobile phone QR codes?

Two-dimensional bar code is a kind of black and white figure distributed on a plane (two-dimensional direction) according to certain rules, which is used to record data symbol information. In coding, the concepts of "0" and "1" bit streams, which constitute the internal logic foundation of the computer, are skillfully used, and several geometric figures corresponding to binary are used to represent the numerical information of characters, which can be automatically read by image input equipment or photoelectric scanning equipment to realize the automatic processing of information: it has some characteristics of barcode technology: each code system has its own specific character set; Each character occupies a certain width; It has certain verification function. At the same time, it also has the characteristics of automatically identifying different lines of information and dealing with the rotation and change of graphics. Two-dimensional code/two-dimensional code can express information in both horizontal and vertical directions at the same time, so it can express a lot of information in a small area.

The cooperation of QR code and mobile phone camera will produce many applications. For example, in the future, we can print the QR code on our business card, and others only need to take a photo with a camera phone with QR code recognition software, and all the information on the business card will be input into the phone; If the goods in the supermarket are also printed with QR codes, we can get a lot of detailed information about the goods on the mobile phone. At present, the QR code has been widely used in Japan and South Korea, and it has also been popularized in Taiwan Province and Chinese mainland. In the future, we can use QR code to buy coke, pay bills and shop online in vending machines.

Classification of 2D Barcode/QR Code

2D barcode/QR code can be divided into stacked 2D barcode and matrix 2D barcode. The stacked/row-arranged two-dimensional bar code is formed by stacking a plurality of rows of chopped one-dimensional bar codes; Matrix two-dimensional bar code consists of a matrix, where binary "1" is represented by dots, binary "0" is represented by spaces, and the coding consists of dots and spaces.

? Two-dimensional bar code with stacked/row arrangement

Stacked/line 2D barcode (also called stacked 2D barcode or layered 2D barcode), its coding principle is based on one-dimensional barcode and stacked into two or more lines as required. It inherits some characteristics of one-dimensional bar code in coding design, checking principle and reading mode, and the reading equipment is compatible with bar code printing and one-dimensional bar code technology. However, due to the increase of the number of lines, it is necessary to judge the number of lines, and its decoding algorithm and software are not exactly the same as those of one-dimensional bar code. Representative two-dimensional bar codes are: Code 16K, Code 49, PDF4 17, etc.

? Matrix QR code

Short array two-dimensional bar code (also known as chessboard two-dimensional bar code) is coded in rectangular space by the different distribution of black and white pixels in the matrix. In the position of the corresponding element in the matrix, the binary "1" is represented by the appearance of points (squares, points or other shapes), and the binary "0" is represented by the absence of points. The arrangement and combination of points determine the meaning represented by matrix two-dimensional bar code. Matrix two-dimensional bar code is a new coding system based on computer image processing technology and combined coding principle, which can automatically read and process graphic symbols. Representative matrix two-dimensional codes include: code one, Maxi code, two-dimensional code, data matrix and so on.

At present, among dozens of QR codes, the commonly used code systems are: PDF4 17 QR code, Datamatrix QR code, Maxicode QR code, Code 49, Code 16K, Code One and so on. In addition to these common two-dimensional barcodes, there are Vericode barcode, CP barcode, Codablock F barcode, Tian Zi barcode and Ultracode. ...& gt& gt

What is the content of two-dimensional code of VAT invoice?

According to the Notice of State Taxation Administration of The People's Republic of China on Trial Operation of Chinese Character Anti-counterfeiting Project of VAT Anti-counterfeiting and Tax Control System (Guo Shui Fa [2011] No.44), the Chinese character anti-counterfeiting project of VAT Anti-counterfeiting and Tax Control System adopts digital password and two-dimensional code technology, replacing the original 84-bit and 108-bit ciphertext with two-dimensional code for storing more information. Based on the encryption of seven elements of invoice information, the functions of encryption, tax collection, decryption and authentication of buyer's enterprise name, seller's enterprise name, goods name, unit and quantity are realized. After the trial operation of China anti-counterfeiting project, the special VAT invoice will have three ciphertext forms: QR code, 84-bit character and 108-bit character.

Such contents include: invoice code, invoice number, buyer's and seller's tax numbers, invoice date, amount, tax amount, buyer's enterprise name, seller's enterprise name, goods name, unit, quantity, etc.

What does the QR code on the train ticket contain? 30 points

The QR code on the train ticket includes the ticket number, departure time, train running interval, name of the ticket purchaser and ID number.

What's in the QR code?

The QR code is specially configured for your account, and you can log in directly by scanning, which is fast and safe.

What can be displayed by scanning the QR code of a train ticket?

An individual can scan the QR code of a train ticket and display a bunch of numbers.

The two-dimensional code of a train ticket contains the identity information and the number of trains, but the two-dimensional code is encrypted, so people can't scan this information with their mobile phones, so they can only scan it with a special scanner at the train station. Train ticket QR code is mainly used for anti-counterfeiting. When passengers refund their tickets, the railway station can quickly transfer tickets according to the two-dimensional code of power.

What does such a QR code use to scan 5 points?

Any scanning device or mobile phone can scan the contents of the QR code as long as it supports this QR code scanning. As for whether it can scan the corresponding information of the QR code, it is difficult to estimate, because this format of barcode is generally used to generate internal identification codes, and it is generally impossible for you to scan the specific information it represents with ordinary scanning software on the market.

What is the text that can be scanned by others after making a QR code on the picture?

You can use the function of converting the two-dimensional code text of forage grass into two-dimensional code, and you can scan the two-dimensional code picture to generate text.