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Олег's questions

Martin Hope
Олег
Asked: 2022-03-07 19:26:09 +0800 CST
  • 2
#include <QApplication>
#include <QWidget>
#include <QDBusConnection>
#include <QDebug>

class Window: public QWidget
{
public:
    Window(){}

    void slot(QString str, QVariantMap map, QStringList list)
    {
        qDebug() << str << map << list;
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Window *win = new Window();
    QDBusConnection con = QDBusConnection::sessionBus();
    bool result = con.connect("org.mpris.MediaPlayer2.chromium.instance14494",
                              "/org/mpris/MediaPlayer2",
                              "org.freedesktop.Properties",
                              "PropertiesChanged", win, SLOT(slot(QString, QVariantMap, QStringList)));
    qDebug() << result;
    return app.exec();
}

QDBUS_DEBUG=1 启动程序时

我得到以下信息：

QDBusConnectionPrivate(0x7fb450003a00) : connected successfully
QDBusConnectionPrivate(0x7fb450003a00) got message (signal): QDBusMessage(type=Signal, service="org.freedesktop.DBus", path="/org/freedesktop/DBus", interface="org.freedesktop.DBus", member="NameAcquired", signature="s", contents=(":1.1735") )
QDBusConnectionPrivate(0x7fb450003a00) delivery is suspended
false
QDBusConnectionPrivate(0x7fb450003a00) dequeueing message QDBusMessage(type=Signal, service="org.freedesktop.DBus", path="/org/freedesktop/DBus", interface="org.freedesktop.DBus", member="NameAcquired", signature="s", contents=(":1.1735") )

在浏览器中切换音乐曲目时，终端中的输出没有变化，dbus-monitor 显示 PropertiesChanged 信号如何抽动。

我也知道org.mpris.MediaPlayer2.chromium.instance14494重启Chromium后，最后数字变了，我用vlc试了一下，结果是一样的。

qt5