Memory problems, please help!

**Slewman** · 22nd October 2009, 16:49

I have an application that has given me no problems for the last week... I boot it up this morning and all of a sudden I am getting unhandled exceptions that point to a memory leak of some sort... I have been trying to figure out why and fix it, but have come up empty handed.

Qt Code:

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void WInterface::toggleCueingSize()
{
  QPushButton *clickedButton = qobject_cast<QPushButton *>(sender());
  if (clickedButton != 0)
  {
    std::string compareString = clickedButton->objectName().toStdString();
    if (compareString.compare("bannerSensorSelectButton")==0)
    {
      ui->wBannerSensorDisplay->show();
      ui->wSensorOnlyDisplay->hide();
      ui->viewModeSettings->hide();
    }
    else if (compareString.compare("sensorOnlySelectButton")==0)
    {
      ui->wBannerSensorDisplay->hide();
      ui->wSensorOnlyDisplay->show();
      ui->viewModeSettings->hide();
    }
    else if (ui->weaponsSensorOnlyDisplay->isHidden())
    {
      ui->wBannerSensorDisplay->hide();
      ui->wSensorOnlyDisplay->show();
    }
    else
    {
      ui->wBannerSensorDisplay->show();
      ui->wSensorOnlyDisplay->hide();
    }
  }
}

void WInterface::toggleCueingSize()
{
  QPushButton *clickedButton = qobject_cast<QPushButton *>(sender());
  if (clickedButton != 0)
  {
    std::string compareString = clickedButton->objectName().toStdString();
    if (compareString.compare("bannerSensorSelectButton")==0)
    {
      ui->wBannerSensorDisplay->show();
      ui->wSensorOnlyDisplay->hide();
      ui->viewModeSettings->hide();
    }
    else if (compareString.compare("sensorOnlySelectButton")==0)
    {
      ui->wBannerSensorDisplay->hide();
      ui->wSensorOnlyDisplay->show();
      ui->viewModeSettings->hide();
    }
    else if (ui->weaponsSensorOnlyDisplay->isHidden())
    {
      ui->wBannerSensorDisplay->hide();
      ui->wSensorOnlyDisplay->show();
    }
    else
    {
      ui->wBannerSensorDisplay->show();
      ui->wSensorOnlyDisplay->hide();
    }
  }
}

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this code gives me this error:

HEAP[PresQT.exe]: Invalid Address specified to RtlFreeHeap( 003F0000, 02C45BA0 )
Unhandled exception at 0x7c90120e in PresQT.exe: User breakpoint.

and it is crashing somewhere in free.c

I have commented out the the QPushButton assignment along with the string and the 2 conditional statements that involve the string, and it works fine... so it has something to do with the dynamic cast and the string assignment, but i dont know why or where the problem is...

anyone have any idea? help is greatly appreciated!