How to get the current file address just opened in a tableView ?

Christian Ehrlicher

@imene said in How to get the current file address just opened in a tableView ?:

How to get the current file address just opened in a tableView ?

Since you can't open a file with qtableview - what's your question?

mchinand

This depends on your code since a QTableView doesn't know anything about the file that the data it is showing came from (or if it even originated from a file); it displays the data of a model.

imene

@Christian-Ehrlicher can i open a file with QTableWidget, did i have to use QTableWidget ?
@mchinand in case that i import the content of a TableView from .csv file, i didn't want to lose the content when i close the app is that possible (i want it to save changes made in the tableview in the current file) ?
This is my code:

void MainWindow::on_Open_Button_clicked()
{
    auto filename = QFileDialog::getOpenFileName(this, "Open", QDir::rootPath(), "CSV File(*.csv)");
    if(filename.isEmpty())
    {
        return;
    }
    QFile file(filename);
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        return;
    }
    QTextStream xin(&file);
    int ix = 0;
    while(!xin.atEnd())
    {
        mModel->setRowCount(ix); //
        qDebug()<<"mModel->setRowCount(ix) "<<ix;

        auto line = xin.readLine();
        qDebug()<<"auto line = xin.readLine(); "<<line;
        auto values = line.split(",");
        qDebug()<<"auto values = line.split(""); "<<values ;
        const int colCount = values.size();
        qDebug()<<"const int colCount = values.size(); "<<colCount ;
        mModel->setColumnCount(colCount);
        qDebug()<<"mModel->setColumnCount(colCount); "<<colCount ;
        for(int jx=0; jx<colCount; ++jx)
        {
            setValueAt(ix, jx, values.at(jx));
            qDebug()<<"setValueAt(ix, jx, values.at(jx)); "<< values.at(jx) ;
        }
        ++ix;


    }

   
    
    file.close();
    connect(m_ui->Table_CSV->model(), SIGNAL(dataChanged(const QModelIndex&, const QModelIndex&)), this, SLOT(on_Save_FUNC(filename)));

}

void MainWindow::on_Save_FUNC(QString filename)
{
    if(filename.isEmpty())
    {
        return;
    }
    QFile file(filename);
    if(!file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        return;
    }
    QTextStream xout(&file);
    const int rowCount = mModel->rowCount();
    const int colCount = mModel->columnCount();
    for(int ix=0; ix<rowCount; ++ix)
    {   xout << getValueAt(ix, 0);
        for(int jx=1; jx < colCount; ++jx)
        {
            xout <<", "<< getValueAt(ix, jx);

        }
        xout <<"\n";
    }
    file.flush();
    file.close();
}

void MainWindow::on_Save_Button_clicked()
{
    auto filename = QFileDialog::getSaveFileName(this, "Save", QDir::rootPath(), "CSV File(*.csv)");
    if(filename.isEmpty())
    {
        return;
    }
    QFile file(filename);
    if(!file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        return;
    }
    QTextStream xout(&file);
    const int rowCount = mModel->rowCount();
    const int colCount = mModel->columnCount();
    for(int ix=0; ix<rowCount; ++ix)
    {   xout << getValueAt(ix, 0);
        for(int jx=1; jx < colCount; ++jx)
        {
            xout <<", "<< getValueAt(ix, jx);

        }
        xout <<"\n";
    }
    file.flush();
    file.close();
}

JonB

@imene
The code you show is actually OK. You show reading a CSV file into a model (which you have created, but do not show). And you have code which will save that model back to a CSV file.

It would not matter if you had chosen to use a QTableWidget instead of a QTableView. Just that it would have provided its own model instead of you creating one, but otherwise similar.

You show two similar functions, on_Save_FUNC(QString filename) and on_Save_Button_clicked(). You don't want to duplicate the saving code, but that's a minor point.

Meanwhile I guess this saves fine when the user clicks the Save button, and you ask for a filename.

You have

connect(m_ui->Table_CSV->model(), SIGNAL(dataChanged(const QModelIndex&, const QModelIndex&)), this, SLOT(on_Save_FUNC(filename)));

If this worked, it would mean you re-save the file after every editing change the user makes. But it won't work, because you cannot do SLOT(on_Save_FUNC(filename)). For that, to save back to the same file as you read, I suggest you put the filename of the file which was opened into a member variable so you can re-use that to save to.

Further, if you do not want to save every time a change is made you might instead check just before the user quits the app (QCoreApplication::aboutToQuit()) whether there are any unsaved changes and save at that point if there are.

Does that answer your questions?

imene

Thanks @JonB yess u did, i'm gonna try (QCoreApplication::aboutToQuit()) ;
What's about creating a global QString that get's File adresse+name each time i make or a New file or a just Opened file?
How could i do it ?
I've added File system path to this function each time i made changes in the tableView, it will be saved into it, is it a good idea i'm gonna used to put it's content in the current file just opened or the new one (The global QString that i want to make it "it get's File adresse+name each time i make or a New file or a just Opened file" )

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    m_ui(new Ui::MainWindow)
{
    m_ui->setupUi(this);

    m_connectDialog = new ConnectDialog;

connect(m_ui->Table_CSV->model(), SIGNAL(dataChanged(const QModelIndex&, const QModelIndex&)), this, SLOT(on_Save_FUNC_System()));

void MainWindow::on_Save_FUNC_System() //statique save tabview in system file
{


    QFile file("/home/pi/can_V3/FileSystem/TabSystem.csv");

    if(!file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        return;
    }
    QTextStream xout(&file);
    const int rowCount = mModel->rowCount();
    const int colCount = mModel->columnCount();
    for(int ix=0; ix<rowCount; ++ix)
    {   xout << getValueAt(ix, 0);
        for(int jx=1; jx < colCount; ++jx)
        {
            xout <<", "<< getValueAt(ix, jx);

        }
        xout <<"\n";
    }
    file.flush();
    file.close();
}

JonB

@imene said in How to get the current file address just opened in a tableView ?:

What's about creating a global QString that get's File adresse+name each time i make or a New file or a just Opened file?

Indeed!

You don't want that hard-coded path you have just put in.

Think about it: you (say you) want to save back to the same file that was opened. So you when opening the file you want to keep that name in a member variable so it is available in the save method. Now you know member variables because you already seem to have a mModel one. You need something like the following changes:

private:
    QString filepathOpened;

void MainWindow::on_Open_Button_clicked()
{
    filepathOpened = QFileDialog::getOpenFileName(this, "Open", QDir::rootPath(), "CSV File(*.csv)");
    ...
}

void MainWindow::on_Save_FUNC()
{
    if(filepathOpened.isEmpty())
    {
        return;
    }
    QFile file(filepathOpened);
    ...
}

imene

@JonB said in How to get the current file address just opened in a tableView ?:

QFile file(filepathOpened);

it doesn't work filepathOpened is not a global variable, did i have to work with it as a pointer ?

JonB

@imene
It does work. Do I have to tell you where to put:

private:
    QString filepathOpened;

This is basic C++, and I already mentioned you seem to have a member variable mModel you are using so you really should know, you cannot use the language if you don't understand classes and member variables....

imene

@JonB in the mainwindow.h isn't it ?

JonB

@imene
OK, better than I thought, well done, I take it back :)

You named it currentFilePath there. You then say "filepathOpened is not a global variable,". I take it you got these names consistent?

In which case, what exactly does "it doesn't work" mean? Member variable saves the file path the user opens in on_Open_Button_clicked(), on_Save_FUNC() uses that as the path to save back to. What could possibly go wrong, you tell me? ;-)

imene

Sorry @JonB
This was my fault i put this under void MainWindow::on_Save_FUNC():

QFile file("/home/pi/"+currentFilePath+".csv");

insted of this:

QFile file(currentFilePath);

it works now and it saves the tabelView content in the file i just opened thanks a lot.

JonB

@imene
Good :) The important thing is to understand how we use that member variable to share the filepath picked for opening with that used for saving.