QQuickImageProvider PyQt5 [英] QQuickImageProvider PyQt5

问题描述

我尝试使用 QQuickImageProvider 将 QImage 发送到 QML，在 C++ Qt5.9.2 中一切正常，但我尝试使用 PyQt5(5.9.2) 进行类似代码，QML 只是说错误:ImageProvider支持Image类型但是没有实现requestImage()，但实际上我实现了requestImage()，这里是我的代码:

I try to use QQuickImageProvider send QImage to QML, everything work well in c++ Qt5.9.2,but I try similar code with PyQt5(5.9.2), QML just says error:ImageProvider supports Image type but has not implemented requestImage(),but in fact,I implemented the requestImage(),here my code:

ma​​in.py:

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtQml import *
from PyQt5.QtQuick import *

class MyImageProvider(QQuickImageProvider):
    def __init__(self):
        super(MyImageProvider, self).__init__(QQuickImageProvider.Image) 

    def requestImage(self, p_str, size):
        img = QImage(300, 300, QImage.Format_RGBA8888)
        img.fill(Qt.red)
        return img, img.size()

app = QGuiApplication([])    

viewer = QQuickView()
viewer.engine().addImageProvider("myprovider", MyImageProvider())
viewer.setResizeMode(QQuickView.SizeRootObjectToView)
viewer.setSource(QUrl("example.qml"))
viewer.show()

app.exec()

example.qml:

import QtQuick 2.7

Item {
    id: root
    width: 800
    height: 600
    Image{
         // width: 300
         // height: 300
         source: "image://myprovider/test.png"
    }
}

也许 requestImage() 在 python 和 C++ 中有不同的参数和返回值，我确定格式是正确的.参考一些例子，http://nullege.com/codes/search/PyQt5.QtQuick.QQuickImageProvider，我不知道我怎么了.

Perhaps requestImage() has different parameters and return values in python and c++,I'm sure that's right in format. refer to some examples, http://nullege.com/codes/search/PyQt5.QtQuick.QQuickImageProvider, I don't know what's wrong with me.

推荐答案

根据我正在审查的问题是 QQuickView 或 QQmlEngine，这些类已经过时了.

According to what I'm reviewing the problem is QQuickView or QQmlEngine, these classes are obsolete.

我推荐你使用 QQmlApplicationEngine:

I recommend you use QQmlApplicationEngine:

ma​​in.py

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtQml import *
from PyQt5.QtQuick import *


class MyImageProvider(QQuickImageProvider):
    def __init__(self):
        super(MyImageProvider, self).__init__(QQuickImageProvider.Image)

    def requestImage(self, p_str, size):
        img = QImage(300, 300, QImage.Format_RGBA8888)
        img.fill(Qt.red)
        return img, img.size()


if __name__ == '__main__':
    app = QGuiApplication(sys.argv)

    engine = QQmlApplicationEngine()
    engine.addImageProvider("myprovider", MyImageProvider())
    engine.load(QUrl.fromLocalFile("example.qml"))
    if len(engine.rootObjects()) == -1:
        sys.exit(-1)
    sys.exit(app.exec_())

example.qml

import QtQuick 2.7
import QtQuick.Window 2.2

Window{
    visible: true
    width: 640
    height: 480
    Image{
         anchors.fill : parent
         source: "image://myprovider/test.png"
    }
}

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