void AccountWindow::displayEvent(const QDate &curDate)
{
QFile file(filename);
file.open(QIODevice::ReadOnly);
QDataStream in(&file);
while(!in.atEnd())
{
    Event *p = new Event;
    in.readRawData((char *)p, sizeof(Event)); 
    if (p->getStartDate() == curDate)
    {
        QString strEvent;
        strEvent = p->getStartDate().toString("MM.dd")
                + p->getStartTime().toString("h:m") + " - "
                + p->getEndDate().toString("MM.dd")
                + p->getEndTime().toString("h:m") + "  "
                + p->getTitle() + '\n';     //此处调用函数
        ui->textBrowser->append(strEvent);
    }
}

//Event.cpp
QString Event::getTitle()
{
    return title;    //此处有错误
}

底层停止了因为它触发了一个异常。
在线程0中停止，因为: Exception at 0x744dc25a, code: 0xc0000005: read access violation at: 0x0, flags=0x0。