退出时qt应用程序崩溃

Question

我在ubuntu18.04中使用了qt5.5，我需要显示3d模型( obj格式)，我使用qquickwidget和qml(Scene3D)，它对显示模型很好，但是当应用程序退出时，它会崩溃。我从qtcreator控制台获得的错误消息如下：

QMutex::lock()                                         0x7ffff53b0725 
QSemaphore::acquire(int)                               0x7ffff53b23f4 
Qt3D::QAspectManager::quit()                           0x7fffc77c03bd 
Qt3D::QAspectEngine::shutdown()                        0x7fffc77be54a 
Qt3D::QAspectEngine::~QAspectEngine()                  0x7fffc77be94e 
Qt3D::QAspectEngine::~QAspectEngine()                  0x7fffc77be9d9 
??                                                     0x7fffc8036c27 
QMetaObject::activate(QObject *, int, int, void * *)   0x7ffff55d3cfa 
QObject::destroyed(QObject *)                          0x7ffff55d4a6f 
QObject::~QObject()                                    0x7ffff55dcdab 
QQuickWindow::~QQuickWindow()                          0x7ffff3d43931 
QQuickWindow::~QQuickWindow()                          0x7ffff3d43999 
??                                                     0x7ffff76bbb8a 
??                                                     0x7ffff76bbc99 
QObject::~QObject()                                    0x7ffff55dcb6b 
QWidget::~QWidget()                                    0x7ffff6fc600b 
QQuickWidget::~QQuickWidget()                          0x7ffff76bb119 
QObjectPrivate::deleteChildren()                       0x7ffff55d2bdc 
QWidget::~QWidget()                                    0x7ffff6fc5f8b

这似乎是因为QQuickWindow析构函数被调用了两次。我试着删除qml中的3d相关核心，只绘制一个简单的2d矩形，它不会崩溃，有人帮我解决这个问题吗，非常感谢。贝娄是我的qml文件；(1) main.qml

import QtQuick 2.0
import QtQuick.Scene3D 2.0
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.2
import Qt3D 2.0

Item {
  id: main

 Camera {
    id: camera
}

Entity {
    components: [
        ShadowMapFrameGraph {
            id: framegraph
            viewCamera: camera
            lightCamera: light.lightCamera
        }
    ]
}

Light {
    id: light
}

AdsEffect {
    id: shadowMapEffect

    shadowTexture: framegraph.shadowTexture
    light: light
}


Scene3D {
    id: scene3D
    anchors.fill: parent
    anchors.verticalCenter: parent.verticalCenter
    focus: true
    aspects: "input"

    obj_model{
        id: model
    }
}
}

(2) obj_model.qml

import Qt3D 2.0
import Qt3D.Renderer 2.0
import QtQuick 2.1 as QQ2

Entity {
id: root
property Material material
Camera {
    id: camera
    projectionType: CameraLens.PerspectiveProjection
    fieldOfView: 40
    aspectRatio: 4/3
    nearPlane : 0.1
    farPlane : 3000.0
    position: Qt.vector3d( 0.0, -1000, 300.0 )
    upVector: Qt.vector3d( 0.0, 0.0, 1.0 )
    viewCenter: Qt.vector3d( 0.0, 0.0, 300.0 )
}

Configuration  {
    controlledCamera: camera
}


components: [
    FrameGraph {
        activeFrameGraph: ForwardRenderer {
            camera: camera
            clearColor: "white"
        }
    }
]

PhongMaterial {
    id: material
    ambient: Qt.rgba( 0.8, 0.8, 0.8, 1.0 )
    diffuse: Qt.rgba( 0.1, 0.1, 0.1, 0.5 )
    shininess: 50 //shining.value
}

Transform {
    id: logoTransform
}

Mesh {
    id: logoMesh
    source: "../res/model.obj"
}

Entity {
    id: logoEntity
    components: [ logoMesh, material, logoTransform ]
}

}

Answer 1

这是qt5.5的一个bug，需要更新qt版本。