[solved] Unresolved external symbol using QTableWidget

[goishin]

@SGaist Thanks for helping out, SGaist! I figure it's probably easier to troubleshoot the new project since it's the exact same issue, and there's so little in the new project. I edited the original post to add more information, including the full .pro file and the mainwindow.cpp file. Hope this helps answer your question.

[goishin]

@SGaist That's what I thought too. I've tried casting to a size_t, which is what the header for setRowCount uses. But that didn't affect the error message. I'm building using the MSVC 2013 64-bit toolkit. There were four options, 64 vs. 32 bit, and VC 2012 / VC 2013. Out of those options I prefer the one I chose, but in the interest of troubleshooting, I also tried some of the other options. But I was unable to use any of the other options as attempting to compile using the other options throws an error stating: "Qt creator needs a compiler set up to build." This tells me that I didn't accidentally switch to a different toolkit sometime in the middle of development and that's why I'm now getting this error. If I did switch to another toolkit, then I'd have had to set one up.

[SGaist]

What header ? setRowCount uses an int

[goishin]

@SGaist Well THAT's weird. I had ctrl+clicked on setRowCount before, and the header file said it used a size_t in the qtablewidget.h file. But when I ctrl+click on setRowCount in the new project, the qtablewidget.h file has the parameter as an int. What gives?

Regardless of that, your last comment had me thinking it might be type related. So I also tried declaring an __int32, and passed that variable in. That didn't work. I also tried a number of other types, such as regular int, size_t again, and unsigned __int32. Nothing changed.

[SGaist]

Can you share your code ?

[goishin]

@SGaist I already posted the code for the brand new project. But here's the mainwindow.cpp file from the old pre-existing project:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <qtreewidget.h>
#include <QtDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow),
    CurrentlySelectedAccount( nullptr )
{
    financials::TheCalculator* calc = new financials::TheCalculator();

    QString filename( "C:\\source\\QT_Projects\\FinancialExplorer\\InputFinancials.ini" );
    calc->ParseInputFile( filename );
    this->CurrentSimulation = calc;

    ui->setupUi(this);
    ui->Accounts->setAnimated( true );

    auto AccountsMap = calc->GetAccounts();
    auto iter = AccountsMap.begin();
    QTreeWidget* accounts = ui->Accounts;
    bool isFirst = true;
    auto selectedIter = AccountsMap.begin();
    while( iter != AccountsMap.end() )
    {
        QTreeWidgetItem* item = new QTreeWidgetItem( accounts, 2 ); // 2 means "Don't show expander if no children"

        item->setText( 0, calc->GetName() );

        // add properties
        QTreeWidgetItem* StartDateItem = new QTreeWidgetItem( item, 0 );
        QString startDateLabel( "Start Date:" );
        startDateLabel.append( calc->GetStartDate().toString());
        StartDateItem->setText( 0, startDateLabel );

        QTreeWidgetItem* EndDateItem = new QTreeWidgetItem( item, 0 );
        QString EndDateLabel( "End Date:" );
        EndDateLabel.append( calc->GetEndDate().toString());
        EndDateItem->setText( 0, EndDateLabel );

        QTreeWidgetItem* CurrentDateItem = new QTreeWidgetItem( item, 0 );
        QString CurrentDateLabel( "Current Date:" );
        CurrentDateLabel.append( calc->GetCurrentDate().toString());
        CurrentDateItem->setText( 0, CurrentDateLabel );

        // add accounts
        QTreeWidgetItem* accountsItem = new QTreeWidgetItem( item, 2 );
        accountsItem->setText( 0, "Accounts" );
        for( auto& account : calc->GetAccounts() )
        {
            QTreeWidgetItem* accItem = new QTreeWidgetItem( accountsItem, 2 );
            accItem->setText( 0, account.second.GetName() );
            accItem->setText( 1, "I'm an account description" );
        }

        // add events
        QTreeWidgetItem* eventsItem = new QTreeWidgetItem( item, 2 );
        eventsItem->setText( 0, "Events" );
        for( auto& event : calc->GetEvents() )
        {
            QTreeWidgetItem* eventItem = new QTreeWidgetItem( eventsItem, 2 );
            eventItem->setText( 0, event.GetName() );
            eventItem->setText( 1, "I'm an event description" );
        }
        item->setText(1, "I'm a description");
        if( isFirst )
        {
            item->setSelected( true );
            selectedIter = iter;
            isFirst = false;
        }
        ++iter;
    }

    connect(ui->Accounts,&QTreeWidget::itemClicked,this,&MainWindow::on_MyTree_itemClicked);

    RefreshTable();
}

void MainWindow::RefreshTable()
{
    financials::TheCalculator* calc = CurrentSimulation;
    if( calc != nullptr )
    {
        size_t lengthOfSimulation = calc->GetLengthOfSimulation();
        ui->Spreadsheet->setRowCount( lengthOfSimulation );
        size_t accountsSize = calc->GetAccounts().size();
        ui->Spreadsheet->setColumnCount( accountsSize );

        int rowIndex = 0;
        while( calc->IsRunning() )
        {
            QString value;
            auto accounts = calc->GetAccounts();
            auto accountsIter = accounts.begin();
            int colIndex = 0;
            while( accountsIter != accounts.end() )
            {
                value = QString::number( (*accountsIter).second.GetCurrentBalance() );
                ui->Spreadsheet->setItem(rowIndex, colIndex++, new QTableWidgetItem( value ));
                ++accountsIter;
            }
            calc->IncrementMonth();
            ++rowIndex;
        }
    }
}

void MainWindow::on_MyTree_itemClicked ( QTreeWidgetItem * item, int column )
{
    qDebug() << "on_MyTree_itemClicked"
        << item->text(column);
    //to do somthing

    QString text = item->text(column);
    if( CurrentSimulation != nullptr )
    {
        auto iter = CurrentSimulation->GetAccounts().find( text );
        if( iter != CurrentSimulation->GetAccounts().end() )
        {
            if( CurrentAccountName != text )
            {
                CurrentAccountName = text;
                CurrentlySelectedAccount = &((*iter).second);
                RefreshTable();
            }
        }
    }
}

MainWindow::~MainWindow()
{
    delete ui;
}

And here's the .pro file from the old project:

#-------------------------------------------------
#
# Project created by QtCreator 2015-08-26T18:06:52
#
#-------------------------------------------------

QT       += core gui widgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = FinancialExplorer
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp \
    accounts.cpp \
    thecalculator.cpp \
    financials.cpp \
    events.cpp

HEADERS  += mainwindow.h \
    accounts.h \
    financials.h \
    thecalculator.h \
    events.h \
    qstringhashfunction.h

FORMS    += mainwindow.ui

DISTFILES += \
    InputFinancials.ini

[SGaist]

Do you also experience the same problem if you create a new project and use QTableWidget in it ?

[goishin]

@SGaist Yes. It appears that I do. I just created a brand new project with nothing in it but the QTableWidget. When I added lines to call setRowCount and setColumnCount I got the same error.

Does this mean I have something misconfigured?

[SGaist]

I wonder if you don't have your Qt headers corrupted

[goishin]

@SGaist Yup, looks like that was it. I uninstalled Qt and reinstalled it and that fixed everything.

[SGaist]

Great :)

By the way, since the last forum update, you can use the Topic Tool button to mark your thread as solved :)