Qfile

打开方式：

 void AddStudents::write_to_file(QString src){
     QFile file("stu.txt");
     if (!file.open(QIODevice::Append | QIODevice::Text)){
         QMessageBox::critical(this,"打开文件错误","确认");
         return;
     }
     QTextStream out(&file);
     out << src;
 
 }

     if(context.length() !=  && name != "" && id !="" && ins.length()!= ){
         int res = QMessageBox::information(this,"请确认信息",context,"确认","取消");
         if(res == ){
             //点击确定
             //由于准备采用readline的方式来读取文件，所以不能是用'\n'来拼接字符串，换成' '符号来拼接
             QString src_s = name +' ' + id+' '+sex+' '+sche+' '+age+' '+ins;
             write_to_file(src_s);
             //恢复添加界面属性值为初始值
             clear_on_addstudent_ok();
         }
     }else{
         QMessageBox::critical(this,"请确认信息","信息不完整，请重新输入！","确认","取消");
         //重新设置光标位置。这里设置name对应的lineEdit控件获取光标
         this->ui->lineedit_name->setFocus();
     }