qt删除文件夹内所有内容

[{"title":"（ 6 个子文件 5KB ） qt删除文件夹内所有内容","children":[{"title":"testDeleteDirContent","children":[{"title":"mainwindow.ui <span style='color:#111;'> 1.83KB </span>","children":null,"spread":false},{"title":"mainwindow.cpp <span style='color:#111;'> 2.39KB </span>","children":null,"spread":false},{"title":"testDeleteDirContent.pro <span style='color:#111;'> 342B </span>","children":null,"spread":false},{"title":"testDeleteDirContent.pro.user <span style='color:#111;'> 23.10KB </span>","children":null,"spread":false},{"title":"main.cpp <span style='color:#111;'> 274B </span>","children":null,"spread":false},{"title":"mainwindow.h <span style='color:#111;'> 425B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]