我在Qt中構建了一個包含兩個按鈕的應用程序:退出按鈕和導入按鈕。當按下導入按鈕時,屏幕上的滾動區會顯示按鈕列表(文件loggers.csv包含數據1; 2; 3; 4; 5;)。在Qt中退出應用程序
它一切正常,但是當我按下退出按鈕(當然應該關閉所有東西),應用程序沒有正常停止(Qt的停止按鈕仍然活動,並且播放按鈕沒有)。當我運行調試器並按下退出按鈕時,它會發出錯誤:指定給RtlFreeHeap(0ADF0000,0028FE40)的地址無效。有誰能夠幫助我?
主
#include <QtGui/QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.showFullScreen();
return a.exec();
}
Mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QtGui>
#include "logger.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
QPushButton exit_btn;
QPushButton import_btn;
private slots:
void createMenus();
void exit();
void import();
private:
int window_width;
int window_height;
int numLoggers;
int numSelected;
QVector<Logger*> loggers;
QScrollArea * scroll_area;
QVBoxLayout scrollLayout;
QWidget viewport;
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);
window_width = QApplication::desktop()->width();
window_height = QApplication::desktop()->height();
createMenus();
connect(&exit_btn,SIGNAL(clicked()),this,SLOT(exit()));
connect(&import_btn,SIGNAL(clicked()),this,SLOT(import()));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::createMenus()
{
import_btn.setParent(ui->centralWidget);
import_btn.setGeometry(400,300,100,100);
import_btn.setText("IMPORT");
exit_btn.setText("EXIT");
exit_btn.setParent(ui->centralWidget);
exit_btn.setGeometry(window_width-50,12,32,32);
viewport.setLayout(&scrollLayout);
viewport.resize(0,0);
scroll_area = new QScrollArea(ui->centralWidget);
scroll_area->setGeometry(0,66,317,window_height-116);
scroll_area->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scroll_area->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scroll_area->setWidget(&viewport);
scroll_area->setGeometry(0,97,317,window_height-228);
scrollLayout.setMargin(0);
scrollLayout.setSpacing(0);
}
void MainWindow::exit()
{
close();
qApp->quit();
}
void MainWindow::import()
{
numSelected=0;
QFile f("Loggers3.csv");
if (f.open(QIODevice::ReadOnly))
{
numLoggers=0;
QString data;
data = f.readAll();
QStringList vals = data.split(';');
while(vals.size()>=1)
{
Logger * logger = new Logger;
logger->setNumber(vals[0].toInt());
vals.removeAt(0);
loggers<<logger;
numLoggers++;
}
f.close();
for(int i=0; i<numLoggers;i++)
{
loggers[i]->createButtons();
scrollLayout.addWidget(loggers[i]->button);
}
viewport.resize(367,numLoggers*60);
}
}
logger.h
#ifndef LOGGER_H
#define LOGGER_H
#include <QtGui>
class Logger : public QWidget
{
Q_OBJECT
public:
explicit Logger(QWidget *parent = 0);
~Logger();
int number;
QLabel num;
QToolButton * button;
bool checked;
signals:
public slots:
void setNumber(int number);
void createButtons();
};
#endif // LOGGER_H
logger.cpp
#include "logger.h"
#include <QtGui>
Logger::Logger(QWidget *parent) :
QWidget(parent)
{
button = new QToolButton;
button->setCheckable(true);
button->setMinimumSize(317,60);
button->setStyleSheet("QToolButton{background-image: url(images/btn_bg); border:none}");
}
Logger::~Logger()
{
}
void Logger::setNumber(int logNumber)
{
number=logNumber;
}
void Logger::createButtons()
{
QLayout * layout = new QHBoxLayout;
QSpacerItem *spacer = new QSpacerItem(120, 31, QSizePolicy::Maximum, SizePolicy::Maximum);
num.setStyleSheet("color: white; font: bold 16px");
num.setText(QString::number(number));
layout->addWidget(&num);
layout->addItem(spacer);
button->setLayout(layout);
}
好,但如果是這樣的話,我在哪裏設置第一佈局?導入按鈕只被推送一次,所以我不會看到第一個佈局的來源。 – Frank
你添加的那段代碼返回Mainwindow的佈局,不是嗎?如果我使用'viewport.layout()'而不是'layout()',它會在第一次點擊導入按鈕時到達qDebug部分。 – Frank
閱讀我的編輯。特別是關於小部件和堆/棧內存分配的最後部分。希望能幫助你。 – stackunderflow