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There is a total of 38 V3.10 customers who have used the V6.10 card software for over 3 years, and the number of users under management exceeds 50,000. The customer service department responds to customers and occasionally reports the loss of charging records. Although not more than 5 times during this period, I After the analysis, the conclusion is drawn from the following reasons.
A. windows form message abnormal or power off
Abnormal phenomenon: The card data has been correctly written, and an exception will be generated when the database charging record is added.
Abnormal reason analysis and solution:
1. The modal form is abnormal in the loading mode form, that is, the process of displaying the charge document is started during the charging process. The charge document form here is also a modal form. I did not use it during the program design process. Some precautions are taken by bridging and delaying within another subroutine when the first mode window loads the second mode. Experience is that individual computers occasionally have this problem, and most of them are operating normally. The specific reason is unknown, and it is estimated that there is a relationship between system hardware or windows message processing mechanism.
Solution: You can choose to print and then fill in the document options. Avoid bills in the display mode form during the charging process.
2. In the process of charging processing is being executed, os crash solutions: This requires the support of good hardware and genuine system software 3. In the process of charging processing is being executed, the power-off solution: equipped with ups is not simple power supply
II. Improper database backup and restore operations
1. The restored database is not a database file that contains all valid records of the backup of the most recent charge record. Of course, the charge record between the two disappeared.
2. There is no backup of the completed database file before re-doing the system. Naturally, these records will be less.
Solution: Please follow the operation manual before handling the system abnormality or replying to the database. If you have any questions, please contact the manufacturer before proceeding.
III. Write card anomalies in the charging process (mostly for this reason, it is also troublesome to solve them)
1. The radio frequency card is at the critical point of the reader antenna range. After the card information is written, no response is received or the contents of the card reader check are abnormal, and the operation of adding a database charging record will not be performed. Although there is a write-in error message box. However, sometimes the card data has already been written into effective usage information. Not only will it be impossible to perform the charging operation (the card contains an effective amount) at the next time, but it will also give the card to the user to insert the card. Not only will this charge record be lost but also be stored in the database. The number of purchases in the number of purchases stored in the card is inconsistent with the number of purchases stored in the card, and the number of times of verification at the next charge operation is, of course, abnormal.
Solution: Write card abnormalities at the time of charge. Follow the marked operation. Make up the card (the last time you use the brush) in the charge operation.
2. The quality of the card, the card operation is not stable, this I wrote a small program to test the stability of the card, and found that this problem does exist.
Solution: Check the quality of the card into the factory.
A. windows form message abnormal or power off
Abnormal phenomenon: The card data has been correctly written, and an exception will be generated when the database charging record is added.
Abnormal reason analysis and solution:
1. The modal form is abnormal in the loading mode form, that is, the process of displaying the charge document is started during the charging process. The charge document form here is also a modal form. I did not use it during the program design process. Some precautions are taken by bridging and delaying within another subroutine when the first mode window loads the second mode. Experience is that individual computers occasionally have this problem, and most of them are operating normally. The specific reason is unknown, and it is estimated that there is a relationship between system hardware or windows message processing mechanism.
Solution: You can choose to print and then fill in the document options. Avoid bills in the display mode form during the charging process.
2. In the process of charging processing is being executed, os crash solutions: This requires the support of good hardware and genuine system software 3. In the process of charging processing is being executed, the power-off solution: equipped with ups is not simple power supply
II. Improper database backup and restore operations
1. The restored database is not a database file that contains all valid records of the backup of the most recent charge record. Of course, the charge record between the two disappeared.
2. There is no backup of the completed database file before re-doing the system. Naturally, these records will be less.
Solution: Please follow the operation manual before handling the system abnormality or replying to the database. If you have any questions, please contact the manufacturer before proceeding.
III. Write card anomalies in the charging process (mostly for this reason, it is also troublesome to solve them)
1. The radio frequency card is at the critical point of the reader antenna range. After the card information is written, no response is received or the contents of the card reader check are abnormal, and the operation of adding a database charging record will not be performed. Although there is a write-in error message box. However, sometimes the card data has already been written into effective usage information. Not only will it be impossible to perform the charging operation (the card contains an effective amount) at the next time, but it will also give the card to the user to insert the card. Not only will this charge record be lost but also be stored in the database. The number of purchases in the number of purchases stored in the card is inconsistent with the number of purchases stored in the card, and the number of times of verification at the next charge operation is, of course, abnormal.
Solution: Write card abnormalities at the time of charge. Follow the marked operation. Make up the card (the last time you use the brush) in the charge operation.
2. The quality of the card, the card operation is not stable, this I wrote a small program to test the stability of the card, and found that this problem does exist.
Solution: Check the quality of the card into the factory.
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