Qt 删除节点

   QFilefile(path);

if(!file.open(QFile::ReadOnly|QFile::Text))
{
std::cerr<<"Error:Cannotreadfile"
<<qPrintable(path)
<<":"<<qPrintable(file.errorString())
<<std::endl;
}
QStringerrorStr;
interrorLine;
interrorColumn;

QDomDocumentdoc;

if(!doc.setContent(&file,false,&errorStr,&errorLine,

&errorColumn))

{

std::cerr<<"Error:Parseerroratline"

<<errorLine<<","

<<"column"<<errorColumn<<":"

<<qPrintable(errorStr)<<std::endl;

}

file.close();
QDomElementroot=doc.documentElement();
QDomNodechild=root.firstChild();
while(!child.isNull())
{
   if(child.toElement().tagName()=="xxxx_cfg")
  {

       QDomElementel=child.toElement();
       QDomNodenodebChild=el.firstChild();
       while(!nodebChild.isNull())
       {
          if(nodebChild.toElement().tagName()=="xxx_name")
          {
              if(nodebChild.toElement().text()==entityName)
              {
                  root.removeChild(child);
                  break;
              }
              nodebChild=nodebChild.nextSibling();
          }
         else
        {
           nodebChild=nodebChild.nextSibling();
        }
      }

  child=child.nextSibling();
 }

else

{

     child=child.nextSibling();

 }

}

QFilef(path);

if(!f.open(QFile::WriteOnly|QFile::Text))

{

std::cerr<<"Error:Cannotreadfile"

<<qPrintable(path)

<<":"<<qPrintable(f.errorString())

<<std::endl;

}

QTextStreamout(&f);

root.save(out,4);

}