Program crashes on creating new dialog

[eekhoorn12]

Hi,

I have a program in which i create a new dialog. It doesn't happen every time i create that dialog, but when i close the dialog and create it again after enough attempts the program crashes.

I create the dialog from a mainwindow with the following code

void MainWindow::newServer()
{
    serverScreen = new newServerScreen();
    serverScreen->setParent(this);
    serverScreen->setWindowFlags(Qt::Window);
    serverScreen->setAttribute(Qt::WA_DeleteOnClose);
    serverScreen->setAttribute(Qt::WA_ShowModal);
    serverScreen->show();
}

void MainWindow::newServer()
{
    serverScreen = new newServerScreen();
    serverScreen->setParent(this);
    serverScreen->setWindowFlags(Qt::Window);
    serverScreen->setAttribute(Qt::WA_DeleteOnClose);
    serverScreen->setAttribute(Qt::WA_ShowModal);
    serverScreen->show();
}

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the code of the dialog is as follows
newServerScreen.h:

#ifndef NEWSERVERSCREEN_H
#define NEWSERVERSCREEN_H
 
#include <QDialog>
#include <QLineEdit>
#include <QCheckBox>
#include <QComboBox>
#include <QLabel>
 
#include <server.h>
 
class newServerScreen : public QDialog
{
public:
    newServerScreen();
 
    //Widgets
    QLineEdit *Addres;
    QLineEdit *Nickname;
    QLineEdit *Username;
    QLineEdit *Password;
    QCheckBox *UseSsl;
    QCheckBox *RequireLogin;
    QComboBox *Connections;
 
    QLabel *labelAddres;
    QLabel *labelNickname;
    QLabel *labelUsername;
    QLabel *labelPassword;
    QLabel *labelConnections;
 
private:
    void createInterface();
    void createActions();
 
    Server *newServer;
};
 
#endif // NEWSERVERSCREEN_H

#ifndef NEWSERVERSCREEN_H
#define NEWSERVERSCREEN_H

#include <QDialog>
#include <QLineEdit>
#include <QCheckBox>
#include <QComboBox>
#include <QLabel>

#include <server.h>

class newServerScreen : public QDialog
{
public:
    newServerScreen();

    //Widgets
    QLineEdit *Addres;
    QLineEdit *Nickname;
    QLineEdit *Username;
    QLineEdit *Password;
    QCheckBox *UseSsl;
    QCheckBox *RequireLogin;
    QComboBox *Connections;

    QLabel *labelAddres;
    QLabel *labelNickname;
    QLabel *labelUsername;
    QLabel *labelPassword;
    QLabel *labelConnections;

private:
    void createInterface();
    void createActions();

    Server *newServer;
};

#endif // NEWSERVERSCREEN_H

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newServerScreen.cpp:

#include "newserverscreen.h"
 
newServerScreen::newServerScreen()
{
    this->createActions();
    this->createInterface();
}
 
void newServerScreen::createActions()
{
}
 
void newServerScreen::createInterface()
{
    this->setWindowTitle(tr("Add new server"));
    Addres = new QLineEdit();
    Nickname = new QLineEdit();
    Username = new QLineEdit();
    Password = new QLineEdit();
    UseSsl = new QCheckBox();
    RequireLogin = new QCheckBox();
    Connections = new QComboBox();
    labelAddres = new QLabel();
    labelNickname = new QLabel();
    labelUsername = new QLabel();
    labelPassword = new QLabel();
    labelConnections = new QLabel();
}

#include "newserverscreen.h"

newServerScreen::newServerScreen()
{
    this->createActions();
    this->createInterface();
}

void newServerScreen::createActions()
{
}

void newServerScreen::createInterface()
{
    this->setWindowTitle(tr("Add new server"));
    Addres = new QLineEdit();
    Nickname = new QLineEdit();
    Username = new QLineEdit();
    Password = new QLineEdit();
    UseSsl = new QCheckBox();
    RequireLogin = new QCheckBox();
    Connections = new QComboBox();
    labelAddres = new QLabel();
    labelNickname = new QLabel();
    labelUsername = new QLabel();
    labelPassword = new QLabel();
    labelConnections = new QLabel();
}

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When i comment out all the lines with new in them in the newServerScreen.cpp file the program doesn't crash.

Once i got the following output from the program in QtCreator:

Starting O:/projects/Post_Program/debug/Post_Program.exe...
ASSERT: "r->d_func()->postedEvents >= 0" in file kernel\qcoreapplication.cpp, line 1235
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
QMutex::lock: Deadlock detected in thread 8976

Starting O:/projects/Post_Program/debug/Post_Program.exe...
ASSERT: "r->d_func()->postedEvents >= 0" in file kernel\qcoreapplication.cpp, line 1235
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
QMutex::lock: Deadlock detected in thread 8976

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I don't know what i did different that time because i can't replicate it.

I program in QtCreator 1.1.0 with Qt 4.5.1 on a Windows 7 RC 64bit


Thanks in advance

[nish]

try to give parent as "this"

void newServerScreen::createInterface()
{
    this->setWindowTitle(tr("Add new server"));
    Addres = new QLineEdit(this);
    Nickname = new QLineEdit(this);
    Username = new QLineEdit(this);
    ...
    ...
    ...    
}

void newServerScreen::createInterface()
{
    this->setWindowTitle(tr("Add new server"));
    Addres = new QLineEdit(this);
    Nickname = new QLineEdit(this);
    Username = new QLineEdit(this);
    ...
    ...
    ...    
}

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or insert them in a layout and set the layout on the dialog

[eekhoorn12]

Thanks that solved the problem.