读取某个TXT文件中的内容，显示在编辑框中。-TXT file to read the contents of a display in the edit box.

后方交会实现地面坐标点计算，通过读取TXT文件将数据导入，并将计算结果输入，快速并且很准确，值得初学者学习-Resection achieve ground coordinates calculated by reading the data into a TXT file and enter the result, fast and very accurate, worth learning for beginners