vb 打印的一个小程序，相关的页面设置等功能较全-A small program vb printing, page setup and other functions related than the whole

一款打印预览控件，全源码，可以参考下，精确到CM,并在程序中统一单位-A print preview control, full source code, can refer to the next, accurate to CM, and in the process of unity