I made my program and declared it(the c++ file I am executing in the main c++ file) as a class public QDialog like this
Qt Code: 
  1. #include <QDialog>
  2. class DateListDialog: public QDialog {
  3. Q_OBJECT
  4. public:DateListDialog();
  5. }
To copy to clipboard, switch view to plain text mode 
but I want to add a menubar and I am not sure how if it is a QDialog so I wish to turn the QDialog into a QMainWindow I tried changing the code on the header to:
Qt Code: 
  1. #include <QMainWindow>
  2. class DateListDialog: public QMainWindow {
  3. Q_OBJECT
  4. public:DateListDialog();
  5. }
To copy to clipboard, switch view to plain text mode 
but then when I do that and add the menubar all it shows it the menubar and not all the other gui items so basically its just an empty QMainWindow

the code I used to add the gui items is this:
Qt Code: 
  1. #include <QtGui>
  2. #include "datelistdialog.h"
  3. #include "listwidgetdialog.h"
  4. #include <sstream>
  5. #include <iostream>
  6. using namespace std;
  7.  
  8. DateListDialog::DateListDialog()
  9. {
  10.  
  11.     QStringList dates, foods, totalCalories, totalProteins, totalCarbs, totalFats, totalSugars, totalSodiums, totalFibers;
  12.     QStringList labels;
  13.     labels << tr("Dates") << tr("Foods") << tr("Total Calories") << tr("Total Proteins") << tr("Total Carbs") << tr("Total Fats") << tr("Total Sugars") << tr("Total Sodiums") << tr("Total Fibers");
  14.  
  15.     treeWidget = new QTreeWidget;
  16.     treeWidget->setColumnCount(9);
  17.     treeWidget->setHeaderLabels(labels);
  18.  
  19.  
  20.     QVBoxLayout *mainLayout = new QVBoxLayout;
  21.     mainLayout->addWidget(treeWidget);
  22.     setLayout(mainLayout);
  23.  
  24.  
  25.         QFile file(QDir::homePath() + "/caloriecounter.txt");
  26.         if (file.open(QIODevice::ReadOnly)){
  27.             QTextStream input(&file);
  28.             input.setCodec("UTF-8");
  29.             while(!input.atEnd()){
  30.                 //dates << input.readLine();
  31.                 foods << input.readLine();
  32.                 totalCalories << input.readLine();
  33.                 totalProteins << input.readLine();
  34.                 totalCarbs << input.readLine();
  35.                 totalFats << input.readLine();
  36.                 totalSugars << input.readLine();
  37.                 totalSodiums << input.readLine();
  38.                 totalFibers << input.readLine();
  39.                 input.readLine();
  40.             }
  41.         }
  42.  
  43.  
  44.     for (int i = 0; i < foods.size(); ++i) {
  46.         //item->setText(0, dates[i]);
  47.         item->setText(1, foods[i]);
  48.         item->setText(2, totalCalories[i]);
  49.         item->setText(3, totalProteins[i]);
  50.         item->setText(4, totalCarbs[i]);
  51.         item->setText(5, totalFats[i]);
  52.         item->setText(6, totalSugars[i]);
  53.         item->setText(7,totalSodiums[i]);
  54.         item->setText(8, totalFibers[i]);
  55.         treeWidget->addTopLevelItem(item);
  56.  
  57.     }
  58.     //createActions();
  59.     //createMenus();
  60. }
To copy to clipboard, switch view to plain text mode 


Any suggestions would be greatly appreciated.
Thanks!