[PyQt] Subclassing QNetworkReply

[Phil Thompson]

On Mon, 2 Mar 2009 18:19:57 +0100, Detlev Offenbach
<detlev at die-offenbachs.de> wrote:
> Hi,
> 
> I am trying to write a subclass of QNetworkReply. This subclass needs to
> have 
> it's own variant of the readData protected method. However, it seems,
that 
> this method doesn't work correctly. How do I have to do this correctly.
My 
> code is shown below.
> 
> --------------
> class HelpNetworkReply(QNetworkReply):
>     def __init__(self, request, fileData):
>         QNetworkReply.__init__(self)
>         
>         self.__data = QBuffer(fileData)
>         
>         self.setRequest(request)
>         self.setOpenMode(QIODevice.ReadOnly)
>         
>         self.setHeader(QNetworkRequest.ContentTypeHeader,
> 		       QVariant("text/html"))
>         self.setHeader(QNetworkRequest.ContentLengthHeader, 
>                        QVariant(QByteArray.number(fileData.length())))
>         QTimer.singleShot(0, self, SIGNAL("metaDataChanged()"))
>         QTimer.singleShot(0, self, SIGNAL("readyRead()"))
>     
>     def abort(self):
>         # do nothing
>         pass
>     
>     def readData(self, buffer, maxlen):
>         l = self.__data.readData(buffer, maxlen)
>         if self.__data.bytesAvailable() == 0:
>             QTimer.singleShot(0, self, SIGNAL("finished()"))
>         return l
> --------------

The Python signature is slightly different as Python strings aren't
mutable. There is no buffer argument and you should return the data as a
Python string.

Phil