[Qgis-developer] Is it possible to re-use print composer code to build a web service ?

[Martin Dobias]

On Mon, Dec 20, 2010 at 4:36 PM, Alessandro Pasotti <apasotti at gmail.com> wrote:
>>
>> It seems that the segfault happens in the python finalization code.
>> Such crashes happen if the qt objects are deleted in wrong order.
>> Presumably the QApplication object has been deleted earlier than the
>> composition. That could be solved by various ways, for example,
>> delete the composition at the end or set QApplication to be parent of
>> the composition.
>>
>> Since the code crashes in the finalization stage, you should get the
>> output png file anyway. Can you please check?
>
> Yes, the out.png is there but it contains a blank (white) image.

Looking at the code, I see that you create an instance of
QgsMapRenderer, but do not initialize. You should call its
setLayerSet() and setExtent() methods so that it knows what to render.

> adding
> c.setParent(app)
> did not help, nor did
> del c
> gdb bt is similar: still crashes in the destructor of QGraphicsScene.

I will try your code in the evening on my dev computer.

Martin