问题：Glib-Gobject-warning **：不能注册现有的'GDKDisplayManager'类型。Glib-Gobject-warning **: 不能注册现有类型'GDKDisplayManager'

Question

我已经用pyqt和opencv python设计了一个接口到我的树莓上，所以当我运行一个基本的测试来打开摄像机时没有任何问题（cv2.imshow('test',frame)，这太基本了，只是为了检查我的摄像机是否在工作），是的，摄像机成功打开了，但当我试图在我的pyqt5上创建的接口中打开摄像机时，问题就发生了，因为它启动了几个错误，但主要是 Glib-Gobject-Warning **: cannot register existing type 'GDKDisplayManager'

完全错误。

Glib-Gobject-Warning **: cannot register existing type 'GDKDisplayManager'
Glib-critical **: g_once_init_leave: assertion 'result != 0 ' failed
Glib-Gobject-CRITICAL **:g_object_new: assertion 'G_TyPE_IS_OBJECT(Object_type)'fail
Glib-GObject-WARNING **: invalid (null) pointer instance
Glib-GObject-CRTICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE(instance)'failed
Glib_GObject-WARNING **: cannot register existing type 'GdkDisplay'
Glib-critical **: g_once_init_leave: assertion 'result != 0 ' failed
Glib-Gobject-CRITICAL **: g_type_register_static: assertion 'parent_Type > 0'failed
Glib-critical **: g_once_init_leave: assertion 'result != 0 ' failed
Glib-Gobject-CRITICAL **:g_object_new: assertion 'G_TyPE_IS_OBJECT(Object_type)'failed

这是打开摄像机的功能

def OpenCamera(self):
    self.setup_CameraSettings()       
    cap = cv2.VideoCapture(self.CameraSource) # video capture source camera (Here webcam of laptop) 
    cap.set(3, self.Resolution_x) # set the resolution
    cap.set(4, self.Resolution_y)
    cap.set(cv2.CAP_PROP_AUTOFOCUS, 0) # turn the autofocus off
    focus = self.Focus  # min: 0, max: 255, increment:5
    cap.set(cv2.CAP_PROP_FOCUS, focus)

    ret,frame = cap.read() # return a single frame in variable `frame`

    if ret== True:            
        cv2.imshow('Settings Test',frame)
        cv2.waitKey(0)
        cv2.destroyAllWindows() 
    else:
        self.popUp_Message('Camera Unplugged')

这段代码在我的PC上成功运行，所以问题不在函数上，我认为是PyQt在我的树莓派上的问题。

Answer 1

当我试图执行类似的错误时，我遇到了类似的错误 ipython2 --matplotlib=qt 在一台运行Ubuntu 18.04、安装了Python 2.7、Python-qt4、Python-pyqt5和Python-pyside的戴尔G7 17 7790笔记本上安装。

安装 python-qtpy 解决了我的问题。希望这对你有用。