problem with QTableWidget and comboBox

frnklu20

Hi,

Let me explain the situation. My program is based in a QDialog that contains a ComboBox and a QTableWidget, and the item selected in the combobox change some non-editable items in the QTableWidget.

Here is the code

void GeradorDialog::on_type_box_currentTextChanged(const QString &arg1)
{
    if(ui->type_box->currentText()=="(V0) Contr. Tensão/Âng."){
        //type_box is the combobox
        item1->setText("Vref");
        unid_item1->setText("pu");
        item2->setText("Aref");
        unid_item2->setText("rad");
        //tabela_fluxo is the QTableWidget
        ui->tabela_fluxo->setItem(0,2,new QTableWidgetItem("1"));
        ui->tabela_fluxo->setItem(1,2,new QTableWidgetItem("0"));



    }
    if(ui->type_box->currentText()=="(PV) Contr. Tensão"){
        item1->setText("P");
        unid_item1->setText("MW");
        item2->setText("Vref");
        unid_item2->setText("pu");
        ui->tabela_fluxo->setItem(0,2,new QTableWidgetItem("0"));
        ui->tabela_fluxo->setItem(1,2,new QTableWidgetItem("1"));


    }
    if(ui->type_box->currentText()=="(PQ)Sem Controle"){
        item1->setText("P");
        unid_item1->setText("MW");
        item2->setText("Q");
        unid_item2->setText("Mvar");
        ui->tabela_fluxo->setItem(0,2,new QTableWidgetItem("0"));
        ui->tabela_fluxo->setItem(1,2,new QTableWidgetItem("0"));

    }
}

So far so good, in the dialog i have a ok button and after it is triggered it emits a signal that saves al the items texts of the QTableItem in a list

void GeradorDialog::changevalues(int i, QString value)
{
    data[i]=value;//data is a QStringList
}

void GeradorDialog::on_buttonBox_clicked()
{

    QMessageBox::StandardButton resposta=QMessageBox::question(this,"","Deseja salvar esses parametros?",QMessageBox::Yes|QMessageBox::No);
    if(resposta==QMessageBox::Yes)
    {
        changevalues(0,ui->name_line->text());
        changevalues(1,ui->area_line->text());
        changevalues(2,ui->sub_line->text());
        changevalues(3,ui->circuito_line->text());
        changevalues(4,Vnom->text());
        changevalues(5,Snom->text());
        changevalues(6,Item1->text());
        changevalues(7,Item2->text());
        changevalues(8,Pmin->text());
        changevalues(9,Pmax->text());
        changevalues(10,Qmin->text());
        changevalues(11,Qmax->text());

        this->close();

}

The problem is that when i click the ok button with the default item in the combo box it works just fine, but if i select another item and press the ok button the porgam crashes. I used Qdebug and it gives me an error in theses lines with the function text:

 changevalues(6,Item1->text());
 changevalues(7,Item2->text());

these QTableItems are changed when i select another item in combo box, but i don't know why it's crashing

SGaist

Hi,

How are you changing these values ?
Looks like you could be re-creating these items rather than updating their content and make these pointers invalid.

frnklu20

i'm using setText, why it would make it invalid?

SGaist

If using only setText it should not.

You should run the debugger and check exactly what happens to your items while changing their value.

I saw that you are replacing some while you use setText for others. Check that you are not replacing items that you have pointers to.