Qml

Question

我从工作线程接收到信号并通过 C++ Singleton (CTaskManager) 将其重新发送到 qml。

void CTaskManager::runAsync(CTask* task)
{
    Q_CHECK_PTR(task);

    QThread* thread  = new QThread();

    task->moveToThread(thread);

    connect(this    , SIGNAL(canceled())                                        , task  , SLOT(cancel())                                            , Qt::DirectConnection);
    connect(task    , SIGNAL(progressChanged(float))                            , this  , SLOT(setProgress(float))                                  , Qt::DirectConnection);
    connect(task    , SIGNAL(finished(bool,unsigned int, const QVariantMap&))   , this  , SLOT(setFinished(bool,unsigned int, const QVariantMap&))  , Qt::DirectConnection);

    connect(thread  , SIGNAL(started())                                         , task  , SLOT(run()));

    connect(task    , SIGNAL(finished(bool,unsigned int, const QVariantMap&))   , thread, SLOT(quit()));

    connect(thread  , SIGNAL(finished())                                        , task  , SLOT(deleteLater()));
    connect(thread  , SIGNAL(finished())                                        , thread, SLOT(deleteLater()));

    thread->start();
}

void CTaskManager::setFinished(bool canceled, unsigned int error, const QVariantMap& args)
{
    emit this->finished(canceled, error, args);
}

这适用于 LINUX 下的 Qt Creator 4.6.1。当我运行在 Windows 下的同一个项目时，我在我的 qml 信号连接中只得到未定义的参数。

Connections
{
    target: TaskManager
    onFinished:
    {
    }
}

有什么想法吗？

Answer 1

这似乎是 Qt 5.11 中已知的错误。

Qml - qml 中的 C++ 信号参数 "undefined"

Qml - c++ signal parameters "undefined" in qml

qt

qt5.10