我正在尝试读取和写入 XML 文件，我正在使用 DOM 解析器读取 XML 文件并使用 xmlputget 进行写入。
这是代码
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);
}当我的程序转到 XML 时它没有任何错误，但是当它转到 XML1 并且更进一步时，每次它进入
if( !inFile.open( QIODevice::ReadWrite | QIODevice::Text ) )
{
qDebug( "无法打开文件进行读取。");
返回;
}
我收到错误消息无法打开文件进行读取。。知道我做错了什么吗？
最佳答案
您正试图以“读写”权限多次打开同一个文件，而没有在每个函数结束时关闭。
要么关闭您的 inFile 以释放每个 XMLn 函数末尾的 r/w 标记。
inFile.close();
要么只用“读”权限打开你的文件
if( !inFile.open( QIODevice::Read | QIODevice::Text ) )
关于c++ - DOM 解析器中的 SetContent 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35333859/