打印精确定位。DELPHI Code,App,Simple to Publish,forum,WEB/FTP uploads Support,member WEB Space or email addr-Print precise positioning. DELPHI Code, App, Simple to Publish, forum, Web / FTP uploads Support, member Web Space or email addr

GPS的发展历史背景及现状 运用GPS进行实际的定位和导航-GPS development of the historical background and current situation of the actual use of GPS positioning and navigation

1.修正，页眉页脚为空时，若设置的边距为0时，打印结果与预览不一致的情况。 2.修正页眉或页脚为空时，会出现“内存访问错误”的提示的问题。 3.修正，页眉页脚为多行时，调整边距游标的定位问题。 4.修改了在有页眉页脚时，如果body的margin与padding都为0时，会出现页眉页脚盖住内容的情况。 5.增加左右不可打印区域对打印的影响。-1. Amended header and footer is empty, if the margins set

usb打印机的端口定位,本程序通过遍历设备找到USB打印机，根据注册表确定端口与状态-usb printer port positioning this program find a USB printer by traversing devices , according to the registry to determine the port and status