认识条码格
条形码种类
条形码技术广泛地应用于商业、工业、字处理、仓储、交通等范畴，其精确度高、低成本、速度快的优点，能大大提高生产效益，而不同设计的条形码所应用的范围也大不相同。
条形码的种类可分为一维条形码、二维条形码及三维条形码。一般来说，以一维条形码较为普及，但所储存的数据则相对地较少。下表简单地介绍数种较为普遍的一维条形码以作参考。
| Category | Sample | Description | Features |
| UPC-A |
 |
The UPC-A Code and the assignment of manufacturer ID numbers are controlled in the U.S.A. by the Uniform Code Council. It is mainly used in the retail products in the USA and Canada. |
-Support digits 0-9 -12 characters length |
| UPC-E |
 |
It is the simplified version of UPC-A code |
-Support digits 0-9 -8 characters length |
| EAN-13 |
 |
EAN-13 is commonly used for commodities in worldwide. IANA controls and assigns the authorities of each member countries. Those barcodes must be allotted and approved by these Authorities. The Authority of Hong Kong is HKANA. |
-Support digits 0-9 -13 characters length |
| EAN-8 |
 |
It is the shortened version of the EAN-13 code. |
-includes digits 0-9 -8 characters length |
| C39 |
 |
Code 39 is able to consist of alphabets and numbers. It is therefore widely used in many industries even in libraries and hospitals. | -includes the digits 0-9, the letters A-Z and the following symbols: 、+ - * / % $ |
| C128 |
 |
C128 can be varied by length. It is much complicated than the above barcodes since it can support longer characters. It has therefore higher flexibility in usages. |
-includes all -numeric and alphanumeric data |