Question

对于更改qtwebkit中的POST变量需要在createRequest（...）中更改或替换outgoingData。如何创建自己的<PyQt4.QtCore.QIODevice object at 0x03BA...>而不是QFile或QByteArray。恰好是QIODevice对象！创建可写设备需要它。或者如何将<PyQt4.QtCore.QBuffer object at 0x03BA...>转换为<PyQt4.QtCore.QIODevice object at 0x03BA...> 此设备最常用于QNetworkAccessManager：
https://qt.gitorious.org/qt/webkit/source/7647fdaf9a4b526581e02fbd0e87c41a96cbfebb:src/network/access/qnetworkaccessmanager.cpp#L941

QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Operation op,
const QNetworkRequest &req,
QIODevice *outgoingData)
...

更新：调用此方法后：

def createRequest(manager, operation, request, data):
    if data.size() > 0:
        post_body = "q=hello"
        output = QtCore.QByteArray()
        buffer = QtCore.QBuffer(output)
        buffer.open(QtCore.QIODevice.ReadWrite)
        buffer.writeData(post_body)
        data = buffer

    reply = QNetworkAccessManager.createRequest(manager, operation, request, data)
    return reply

脚本挂起......

Answer 1

如果我理解你的问题，A QBuffer已经是（摘要，如@mdurant）QIODevice类所述的实现。所以例如（我在PySide上尝试了这个，但我相信PyQt应该是相同的）：

>>> from PySide.QtCore import QIODevice, QBuffer, QByteArray
>>> buff = QBuffer(QByteArray())
>>> isinstance(buff, QIODevice)
True

要创建可写QIODevice写入QByteArray，您可以执行或多或少的操作：

ba = QByteArray()
buff = QBuffer(ba)
buff.open(QIODevice.WriteOnly)

您现在可以写为buff，就像它是QIODevice一样，然后数据将在ba中提供。

Answer 2

基本上你很接近，我想知道为什么你没有得到分段错误，每当我没有设置新数据对象的父对象时，它就发生在我身上：

def createRequest(manager, operation, request, data):
    if data.size() > 0:
        data = QBuffer(QByteArray("q=hello"))
        # data was originally a ReadOnly device as well, keep it that way
        data.open(QIODevice.ReadOnly)

    reply = QNetworkAccessManager.createRequest(manager, operation, request, data)
    # must explicitly set the parent of the newly created data object to this reply object. 
    data.setParent(reply)

    return reply

我在这里写了这个确切的问题：https://github.com/integricho/path-of-a-pyqter/tree/master/qttut07

如何在qtwebkit中更改POST数据？

2 个答案: