Import data from txt file to QTableWidget in Qt

[hael1902]

I am trying to import a sudoku game saved in a txt file to QTableWidget for a sudoku projekt, here is my txt file:

000891470
003200006
009300080
281000060
360908015
050000834
030009600
100006700
072185000

and here is my code in Qt:

void MainWindow::TableWidgetDisplay()
{
    QTableWidget *table = new QTableWidget(this);
    table->setRowCount(9);
    table->setColumnCount(9);

    this->setCentralWidget(table);
    table->horizontalHeader()->hide();
    table->verticalHeader()->hide();

    //Inseret data
    if(!file){
        std::cerr << "Unable to open file sudoku.txt";
        exit(1);   // call system to stop
    }

    //savedGames game (10);

    //importGames(game);

    //int Num = 1;

    graph matrix;
    char ch;
    matrix.resize(9,std::vector<int>(9));
    for(int i = 0; i <= 8; i++){
        for(int j = 0; j <= 8;){
            file >> std::noskipws >> ch;
            int a = ch - '0';
            if(a >= 0 && a <= 9){
                matrix[i][j]= a;
                j++;
            }
        }
    }

    for ( int row = 0; row < table->rowCount(); ++row ) {
        QTableWidgetItem *item;
        for ( int column = 0; column < table->colorCount(); ++column ) {
            item = new QTableWidgetItem;
            if(matrix[row][column]!=0) {
                //table->setItem(row, column, new QTableWidgetItem(game[Num][row][column]));
                item->setText(QString::number(matrix[row][column]));
                table->setItem(row, column, item);
            }
        }
    }
}

file is a global variable

std::fstream file("/Users/hassan/OneDrive/Documents/Civilingenjör/Å.K 2/Period 2/Programmeringsmetodik/Laborationer/lab6/Qt/mac/Sudoku", std::fstream::in);

What am I doing wrong? The program does compile but the preview windows does not start.

[StarterKit]

Very similar topic was discussed recently. I would advice you to look there.

[JonB]

@hael1902
Apart from following @StarterKit's good link, and putting in your own debug statements/stepping through under debugger, which is always the first port-of-call when you have unexpected behaviour during development:

for ( int column = 0; column < table->colorCount(); ++column ) {

Either your code will not compile, or you have not copied & pasted your actual code but instead typed in by hand. Please do not do that, people here waste much time analysing questioners' code only to find they say "Oh, I didn't type it in correct, I have something else"....

UPDATE
My huge apologies! I had never heard of QTableWidget::colorCount()!! I was sure you had table->columnCount()....

...Which now raises a question. Isn't your code incorrect because you do intend columnCount() here but have picked colorCount() perhaps accidentally from code autocompletion...? :)

[Christian Ehrlicher]

@JonB said in Import data from txt file to QTableWidget in Qt:

Either your code will not compile,

It does :D

https://doc.qt.io/qt-5/qpaintdevice.html#colorCount

[JonB]

@Christian-Ehrlicher
Thank you for pointing out my mistake :D I have UPDATEd my post above to apologise. But I wonder what the chances are that this is the cause of the OP's problem, because I would have thought he intended table->columnCount()....

[SGaist]

Hi,

@hael1902 said in Import data from txt file to QTableWidget in Qt:

TableWidgetDisplay

When is that method supposed to be called ?