this is rich data

[b] this is money data
[b] two card is the same
But the rich data is written to no money inside the card, two card block 3 B is the same password, the password is different, A password is incorrect, A show password mistake, asked the great spirit to guide the [/B]

CodePudding user response:

Is it not a question of writing data! Drunk, just don't write directly into the corresponding sectors

CodePudding user response:

1. What type of card
2. How many sectors, can you read
3. It comes to money, is typically online authentication, if special circumstances can't online certification, such as public transportation card, also want to check every day, as long as there is a problem, one day is sure to find

CodePudding user response:

Card amount of data and data in the database is consistent, can be normal use,
Should read/write CARDS is small, and the server data is consistent,

CodePudding user response:

The problems faced by the building there are two possible:
1, the problem of IC card code;
2, (maybe) need to do it with other devices on the problem of data consistency (watch the bus card actual situation, the IC card operation details & lt; Such as a certain time moment where credit card & gt; Should not synchronized to the server, -- the total number of credit card machine according to have upload);
But there may be other problems:
3, stuck inside the data using the card number for verification?

CodePudding user response:

IC only save user name, password, and so on information, how much money is saved in the database, you cannot be changed,

CodePudding user response:

Card number not to, tube feather with ah, you calculate card number corresponds to A password, first is to have no, your B card card number is locked, can't copying, card must use the password! Want to copying, use blank CUI D can rewrite card number! Water card I was copying, and then change the amount of more than several hundred yuan, no credit card, can only be copying, card number must be written to 0 sectors,