QT 程序 删除文本文件中某一行

[{"title":"（ 12 个子文件 345KB ） QT 程序 删除文本文件中某一行","children":[{"title":"Makefile <span style='color:#111;'> 6.79KB </span>","children":null,"spread":false},{"title":"vc90.pdb <span style='color:#111;'> 436.00KB </span>","children":null,"spread":false},{"title":"release","children":null,"spread":false},{"title":"Makefile.Debug <span style='color:#111;'> 5.42KB </span>","children":null,"spread":false},{"title":"debug","children":[{"title":"DeleteOnelineInfile.exe <span style='color:#111;'> 25.50KB </span>","children":null,"spread":false},{"title":"DeleteOnelineInfile.pdb <span style='color:#111;'> 603.00KB </span>","children":null,"spread":false},{"title":"DeleteOnelineInfile.ilk <span style='color:#111;'> 303.89KB </span>","children":null,"spread":false},{"title":"main.obj <span style='color:#111;'> 45.01KB </span>","children":null,"spread":false},{"title":"DeleteOnelineInfile.intermediate.manifest <span style='color:#111;'> 878B </span>","children":null,"spread":false}],"spread":true},{"title":"main.cpp <span style='color:#111;'> 2.06KB </span>","children":null,"spread":false},{"title":"DeleteOnelineInfile.pro <span style='color:#111;'> 321B </span>","children":null,"spread":false},{"title":"Makefile.Release <span style='color:#111;'> 5.39KB </span>","children":null,"spread":false},{"title":"DeleteOnelineInfile.pro.user <span style='color:#111;'> 18.46KB </span>","children":null,"spread":false}],"spread":true}]