PIO read and write Excel example, to a certain extent, they are not used cycle s...

代码说明：

PIO读写EXCEL实例，有一定不足，没有用到循环语句。不过涉及到读和写的一些设置，对开发一定有帮助。-PIO read and write Excel example, to a certain extent, they are not used cycle statement. However relates to read and write some settings, the development will certainly be helpful.