Question

嗨我有Phonon和插槽有问题，我先试试这个，希望你能帮助我，

#include <QMainWindow>
#include <QWidget>
#include <phonon/VideoPlayer>
#include <phonon/VideoWidget>
#include <phonon/MediaObject>
#include <phonon/MediaSource>
#include <phonon>
#include <QVBoxLayout>
#include <QFileDialog>
#include <QPushButton>
#include <QUrl>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
MainWindow(QWidget *parent = 0);
~MainWindow();
QPushButton *quit;
QPushButton *addFile;
QWidget *Main;
Phonon::VideoPlayer *player;
public slots:

    void startVideo();

};

我的标题^

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
Main = new QWidget;
addFile = new QPushButton("Dodaj Plik");
quit = new QPushButton("Zamknij");
player = new Phonon::VideoPlayer(Phonon::VideoCategory, Main);
QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(addFile);
    layout->addWidget(quit);
    layout->addWidget(player);
Main->setWindowTitle("Phonon");
Main->setLayout(layout);
Main->setGeometry(550, 312, 640, 480);
Main->show();
QObject::connect(addFile, SIGNAL(clicked()), player, SLOT(startVideo()));
QObject::connect(quit, SIGNAL(clicked()), Main, SLOT(close()));
}

MainWindow::~MainWindow()
{

}
void MainWindow::startVideo()
{
QString file = QFileDialog::getOpenFileName(this, tr("odtworz film"));
player->play(file);
}

来源^

现在应用程序运行没有问题但是当我点击＆＃34; dodaj plik＆＃34;没有任何反应，调试器说没有像startVideo()

这样的插槽

你能帮我解决一下吗？

Answer 1

问题是你建立了这样的连接：

QObject::connect(addFile, SIGNAL(clicked()), player, SLOT(startVideo()));

但是startVideo()类中定义了MainWindow个广告位。因此，正确的连接应如下所示：

connect(addFile, SIGNAL(clicked()), this, SLOT(startVideo()));

不需要QObject::前缀，因为QMainWindow - 基类已经是QObject。

Phonon :: VideoPlayer Qt 4.8.6

1 个答案: