DOM解析器中的SetContent错误

Question

我正在尝试读取和编写XML文件，我使用DOM解析器来读取XML文件并使用xmlputget来编写。 这是代码

＆＃13;

＆＃13;

void MainWindow::on_Save_button_clicked()
{
   XML();
   XML1();
   XML2();
   XML3();
   XML4();
   XML5();
}
void::MainWindow::XML()
{
    QString path = ui->lineEdit_7->text();
    QFile inFile(path );
        if( !inFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
        {
            qDebug( "Failed to open file for reading." );

        }

        QDomDocument dom;
        if( !dom.setContent( &inFile ) )
        {
            qDebug( "Failed to parse the file into a DOM tree." );
            inFile.close();

        }
        
            QDomElement docElem = dom.documentElement();
            QDomNodeList node = docElem.elementsByTagName("ABC");
            QDomNode parentNode = node.at(0).parentNode();
            parentNode.removeChild(node.at(0));
            QFile outFile(path);
            if( !outFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
            {
                qDebug( "Failed to open file for writing." );
            }
            QTextStream stream( &outFile );
            stream << dom.toString();
            outFile.close();
            QXmlGet xmlget;
            xmlget.load(path);
            xmlget.findAndDescend("HEADER");
            QXmlPut xmlput(xmlget);
            xmlput.putString("ABC", "abc");
            xmlput.save(path);
        
}
void MainWindow::XML1()
{

    QString path = ui->lineEdit_7->text();
    QFile inFile(path );
        if( !inFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
        {
            qDebug( "Failed to open file for reading." );

        }
        QDomDocument dom;
        if( !dom.setContent( &inFile ) )
        {
            qDebug( "Failed to parse the file into a DOM tree." );
            inFile.close();

        }
        
            QDomElement docElem = dom.documentElement();
            QDomNodeList node = docElem.elementsByTagName("FILE");
            QDomNode parentNode = node.at(0).parentNode();
            parentNode.removeChild(node.at(0));

            QFile outFile(path);
            if( !outFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
            {
                qDebug( "Failed to open file for writing." );
            }
            QTextStream stream( &outFile );
            stream << dom.toString();
            outFile.close();
            QXmlGet xmlget;
            xmlget.load(path);
            xmlget.findAndDescend("HEADER");
            QXmlPut xmlput(xmlget);
            xmlput.putString("FIle", "file");
            xmlput.save(path);
        
}
void MainWindow::XML2()
{
    QString path = ui->lineEdit_7->text();
    QFile inFile(path);
        if( !inFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
        {
            qDebug( "Failed to open file for reading." );

        }
        QDomDocument dom;
        if( !dom.setContent( &inFile ) )
        {
            qDebug( "Failed to parse the file into a DOM tree." );
            inFile.close();
            return;
        }
        
            QDomElement docElem = dom.documentElement();
            QDomNodeList node = docElem.elementsByTagName("Main");
            QDomNode parentNode = node.at(0).parentNode();
            parentNode.removeChild(node.at(0));
            QFile outFile(path);
            if( !outFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
            {
                qDebug( "Failed to open file for writing." );
            }
            QTextStream stream( &outFile );
            stream << dom.toString();
            outFile.close();
            QXmlGet xmlget;
            xmlget.load(path);
            xmlget.findAndDescend("HEADER");
            QXmlPut xmlput(xmlget);
            xmlput.putString("main", "main");
            xmlput.save(path);
        }
}
void MainWindow::XML3()
{
    QString path = ui->lineEdit_7->text();
    QFile inFile(path );
        if( !inFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
        {
            qDebug( "Failed to open file for reading." );

        }

        QDomDocument dom;
        if( !dom.setContent( &inFile ) )
        {
            qDebug( "Failed to parse the file into a DOM tree." );
            inFile.close();
            return;
        }
          
            QDomElement docElem = dom.documentElement();
            QDomNodeList node = docElem.elementsByTagName("Root");
            QDomNode parentNode = node.at(0).parentNode();
            parentNode.removeChild(node.at(0));
            QFile outFile(path);
            if( !outFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
            {
                qDebug( "Failed to open file for writing." );
            }
            QTextStream stream( &outFile );
            stream << dom.toString();
            outFile.close();
            QXmlGet xmlget;
            xmlget.load(path);
            xmlget.findAndDescend("HEADER");
            QXmlPut xmlput(xmlget);
            xmlput.putString("Root", "root");
            xmlput.save(path);
}

＆＃13;

＆＃13;

＆＃13;

当我的程序转到XML时，它没有任何错误，但是当它转到XML1时，每次进入

if( !inFile.open( QIODevice::ReadWrite | QIODevice::Text ) ) { qDebug( "Failed to open file for reading." ); return; }

我收到错误Failed to open file for reading.。知道我做错了什么吗？

Answer 1

您尝试使用“读取和写入”权限多次打开同一个文件，而不会在每个函数结束时关闭。

关闭inFile以在每个XMLn函数结束时释放r / w标记。

inFile.close();

使用“read”右侧

打开文件

if( !inFile.open( QIODevice::Read | QIODevice::Text ) )