The code 39 of bar code is used in automatic system of library at present. The article introduces the cod principle and character of the code 39,the design method of printing and brief programmed code of visual C++.

• 目前图书馆自动化系统中条形码多采用 39码 ,文章介绍了 39码的编码原理及特点 ,打印设计方法及简短的VisualC + +程序代码。