Rename file if button is pressed in TreeView Qt - c++

Question

I have a treeview that displays a folder with text files. There is a 'open' button. That will open the file. But when this button is pressed it should rename the file to: read filename.txt. So if there is a file for example that is name nameslist.txt and the button is pressed it should rename it to read nameslist.txt or something similar. I thought of something like this:
void berichtenhistorie::on_Openbutton_released()
{
QModelIndex index = ui->treeView->currentIndex();
QString name = index.fileName();
QString path = index.filePath();
QFile file(path);
file.open(QIODevice::WriteOnly | QIODevice::Text);
file.rename("read " + name);
file.close();
}
But this isnt working. I get the following error's:
error: C2352: 'QDirModel::fileName' : illegal call of non-static member function
But I dont know how to use fileName() and filePath() correctly.
Thanks for help!

Answer 1

I think that here is what you looking for:
void berichtenhistorie::on_Openbutton_released()
{
QModelIndex index = ui->treeView->currentIndex();
QFileSystemModel *model = (QFileSystemModel*)ui->treeView->model();
QString path = model->filePath(index);
QString name = model->fileName(index);
QString dir = path;
dir.remove(dir.size() - name.size(), name.size());
QFile file(path);
if(file.open(QIODevice::WriteOnly | QIODevice::Text))
{
//Interact with the file
file.close();
if(file.rename(QString("%1read %2").arg(dir, name)))
qDebug() << "Renamed";
}
}

Answer 2

Here's a break out of each step you'll need to do to work with QFile.
QFile file("test.txt");
if(file.exists())
{
qDebug() << "found file";
if(file.open(QIODevice::ReadWrite))
{
qDebug() << "opened";
if(file.rename("text1.txt"))
{
qDebug() << "renamed";
}
else
{
qDebug() << "failed to rename";
}
file.close();
}
}
else
{
qDebug() << "file does not exist";
}
In the end, you'll only really need your debugger to step through instead of printing out everything known to your application. E.g.
QFile file("test.txt");
if(file.exists() && file.open(QIODevice::ReadWrite))
{
if(file.rename("text1.txt"))
{
qDebug() << "renamed";
}
file.close();
}