Problem with new QTableWidgetItem

[danilodsp]

An error occurs when running this:

My h:

QTableWidgetItem* itemTable[];

QTableWidgetItem* itemTable[];

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My cpp:

conTable = 0;
var1 = 0;
itemTable[conTable] = new QTableWidgetItem("text1");
ui->tableWidget->setItem(var1,0,itemTable[conTable]);
conTable++;
itemTable[conTable] = new QTableWidgetItem("text2");
ui->tableWidget->setItem(var1,1,itemTable[conTable]);
conTable++;

conTable = 0;
var1 = 0;
itemTable[conTable] = new QTableWidgetItem("text1");
ui->tableWidget->setItem(var1,0,itemTable[conTable]);
conTable++;
itemTable[conTable] = new QTableWidgetItem("text2");
ui->tableWidget->setItem(var1,1,itemTable[conTable]);
conTable++;

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What's wrong in making a new in QTableWidgetItem?

[nix]

Normal, your

QTableWidgetItem* itemTable[];

is something equivalent to QTableWidgetItem **itemTable.
But you do the allocation of QTableWidgetItem but not it's address.

Seriously this is C code, use Qt containers instead, look to QVector or QList. Something like

QVector<QTableWidgetItem *> itemTable;

should be fine.

[danilodsp]

I don't understand.

I use the normal QTreeWidgetItem and it works.

itemTree[num] = new QTreeWidgetItem(ui->treeWidget);
itemTree[num]->setText(0,Tag[num]->nome);
num++;

itemTree[num] = new QTreeWidgetItem(ui->treeWidget);
itemTree[num]->setText(0,Tag[num]->nome);
num++;

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Use vector will be a problem.
I want use as a pointer and create indefinitely to fill a table.

[jacks916]

you may have to format it more like this so that you can access the item later.

ui.table->setItem( row , 0, new QTableWidgetItem() );
ui.table->item(row , 0 )->setText(QString( "%1" ).arg( num ) );
ui.table->item(row, 0 )->setBackgroundColor( QColor(178,34,34) );

ui.table->setItem( row , 0, new QTableWidgetItem() );
ui.table->item(row , 0 )->setText(QString( "%1" ).arg( num ) );
ui.table->item(row, 0 )->setBackgroundColor( QColor(178,34,34) );

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Something I found out after hours of invalid pointer access

[danilodsp]

Perfect.
That's what I needed.

Thanks.

[ChrisW67]

Where do you allocate space to hold the array of QTableWidgetItem pointers? If you never do that then this a recipe for serious crashing. Using a QList<QTableWidgetItem*> or QVector<QTableWidgetItem*> is a far safer option.

[jacks916]

Chris was that to me?

They get held into the QTableWidget, I just reference them in the row and col of the table ( item( row, col) ), for my application they work fine, no issues, and no risk. They only get replaced when i say so.

[ChrisW67]

No, it was for the OP.