QT选择打开指定目录文件，处理txt内容，并通过串口发送

[{"title":"（ 7 个子文件 43KB ） QT选择打开指定目录文件，处理txt内容，并通过串口发送","children":[{"title":"testFile","children":[{"title":"main.cpp <span style='color:#111;'> 183B </span>","children":null,"spread":false},{"title":"serialport.pro.user <span style='color:#111;'> 23.39KB </span>","children":null,"spread":false},{"title":"serialport.pro <span style='color:#111;'> 1.05KB </span>","children":null,"spread":false},{"title":"mainwindow.h <span style='color:#111;'> 1.34KB </span>","children":null,"spread":false},{"title":"mainwindow.cpp <span style='color:#111;'> 15.25KB </span>","children":null,"spread":false},{"title":"mainwindow.ui <span style='color:#111;'> 7.65KB </span>","children":null,"spread":false},{"title":"HEX20220515 - 副本.txt <span style='color:#111;'> 748.58KB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]