[Qt-interest] Qt Complex Data structure (user defined classes with QMap)

[Jaco Naude]

You never initialize set before using it. That will crash your program.


this->set->warning["yogesh"] = list;




On Mon, Apr 4, 2011 at 8:43 AM, Jaco Naude <naude.jaco at gmail.com> wrote:

> Run it in debug mode and see where it crashes...
>
> On Mon, Apr 4, 2011 at 7:36 AM, yogesh upreti <yogesh.upreti at gmail.com>wrote:
>
>> Hello All,
>>
>> I am trying to make some complex data structure in Qt. My code looks like
>> this (using Qt Creator) :
>>
>> main.cpp:
>>
>> #include <QtGui/QApplication>
>>
>> #include "mainwindow.h"
>>
>>  int main(int argc, char *argv[])
>>
>> {
>>
>>     QApplication a(argc, argv);
>>
>>     MainWindow w;
>>
>>     w.show();
>>
>>      return a.exec();
>>
>> }
>>
>>
>> mainwindow.h:
>>
>> #ifndef MAINWINDOW_H
>>
>> #define MAINWINDOW_H
>>
>> #include <QMainWindow>
>>
>> #include <QtGui>
>>
>> namespace Ui {
>>
>>     class MainWindow;
>>
>> }
>>
>> class SettingsClass {
>>
>> public:
>>
>>     SettingsClass();
>>
>>     QMap<QString, QList<int> > warning;
>>
>> };
>>
>> class MainWindow : public QMainWindow
>>
>> {
>>
>>     Q_OBJECT
>>
>> public:
>>
>>     explicit MainWindow(QWidget *parent = 0);
>>
>>     SettingsClass *set;
>>
>>     ~MainWindow();
>>
>> private:
>>
>>     Ui::MainWindow *ui;
>>
>> };
>>
>> #endif // MAINWINDOW_H
>>
>>
>> mainwindow.cpp:
>>
>> #include "mainwindow.h"
>>
>> #include "ui_mainwindow.h"
>>
>> #include <QtGui>
>>
>>  MainWindow::MainWindow(QWidget *parent) :
>>
>>     QMainWindow(parent),
>>
>>     ui(new Ui::MainWindow)
>>
>> {
>>
>>     ui->setupUi(this);
>>
>>     QList<int> list = QList<int>();
>>
>>     list.append(1);
>>
>>     list.append(2);
>>
>>     list.append(3);
>>
>>     list.append(4);
>>
>>     list.append(5);
>>
>>     this->set->warning["yogesh"] = list;
>>
>>      QMapIterator<QString, QList<int> > itr(this->set->warning);
>>
>>     while(itr.hasNext()){
>>
>>         itr.next();
>>
>>         QList<int> temp = itr.value();
>>
>>         for(int i=0; i<temp.size();i++){
>>
>>             ui->textEdit->insertPlainText(QString(">> %1: %2 -> %3\n").arg(itr.key()).arg(i).arg(temp.at(i)));
>>
>>         }
>>
>>     }
>>
>> }
>>
>>  MainWindow::~MainWindow()
>>
>> {
>>
>>     delete ui;
>>
>> }
>>
>>
>>
>> My programme compiles properly but its not running and exit with code
>> -1073741819
>> anyone knows what could be the problem with the user defined class??
>>
>> Thanks
>> Yogesh Upreti
>>
>>
>> _______________________________________________
>> Qt-interest mailing list
>> Qt-interest at qt.nokia.com
>> http://lists.qt.nokia.com/mailman/listinfo/qt-interest
>>
>>
>
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