[Qgis-developer] Qgis standalone apps

[Massimo Di Stefano]

Hello All,


i'm tring to apply the changes you suggest me .. but with no good results
(again my fault)

i tried to change the code to :

http://www.geogemengineering.it/data/qgistry.py

but i got : 

python /qgistry.py
Traceback (most recent call last):
  File "/qgistry.py", line 68, in <module>
    app = MainApp()
  File "/qgistry.py", line 61, in __init__
    QApplication.__init__(self)
TypeError: arguments did not match any overloaded call:
  QApplication(list-of-str): not enough arguments
  QApplication(list-of-str, bool): not enough arguments
  QApplication(list-of-str, QApplication.Type): not enough arguments


can you help me to have it running ?

thanks a lot !!!

Massimo.


Il giorno 10/set/2010, alle ore 02.07, qgis-developer-request at lists.osgeo.org ha scritto:

> Hi Massimo,
> 
> On Fri, Sep 10, 2010 at 12:10 AM, Massimo Di Stefano <
> massimodisasha at yahoo.it> wrote:
> 
>> Hi All,
>> 
>> i'm tring to start some coding on the qgis api
>> i'm on osx 10.6.4 running qgis 1.6
>> 
>> following the example from :
>> 
>> 
>> 
>> http://mapserver.sk/~wonder/qgis/html/canvas.html#using-map-tools-with-canvas<http://mapserver.sk/%7Ewonder/qgis/html/canvas.html#using-map-tools-with-canvas>
>> 
>> it works fine if i call it from a qgis-python shell
>> 
>> but i tried to make small changes to have it running as a standalone
>> application,
>> 
>> i eliminated the "layer" from the init line :
>> 
>> QMainWindow.__init__(self)
>> 
>> used a custom extent :
>> 
>> self.canvas.setExtent('15.1845401903089403,40.6214856769878665 :
>> 15.2339879807105998,40.6477493100907381')
>> 
>> and commented out the line :
>> 
>> #self.canvas.setLayerSet( [ QgsMapCanvasLayer(layer) ] )
>> 
>> then from a standard python shell, i tried :
>> 
>>>>> import mywnd
>>>>> dir(mywnd)
>> ['MyWnd', 'QAction', 'QMainWindow', 'QString', 'QgisInterface',
>> 'QgsAnnotationItem', 'QgsColorButton', 'QgsColorButtonV2',
>> 'QgsComposerView', 'QgsEncodingFileDialog', 'QgsFormAnnotationItem',
>> 'QgsGenericProjectionSelector', 'QgsLegendInterface', 'QgsMapCanvas',
>> 'QgsMapCanvasItem', 'QgsMapCanvasLayer', 'QgsMapCanvasMap',
>> 'QgsMapCanvasSnapper', 'QgsMapOverviewCanvas', 'QgsMapTip', 'QgsMapTool',
>> 'QgsMapToolEmitPoint', 'QgsMapToolPan', 'QgsMapToolZoom',
>> 'QgsMessageViewer', 'QgsProjectBadLayerGuiHandler', 'QgsProjectionSelector',
>> 'QgsQuickPrint', 'QgsRendererV2PropertiesDialog', 'QgsRendererV2Widget',
>> 'QgsRubberBand', 'QgsStyleV2ManagerDialog', 'QgsSymbolLayerV2Widget',
>> 'QgsSymbolV2PropertiesDialog', 'QgsSymbolV2SelectorDialog',
>> 'QgsTextAnnotationItem', 'QgsVertexMarker', 'Qt', 'SIGNAL', '__builtins__',
>> '__doc__', '__file__', '__name__', '__package__']
>>>>> w = mywnd.MyWnd()
>> QWidget: Must construct a QApplication before a QPaintDevice
>> Abort trap
>> 
> the MyWnd is a QWidget.
> 
> You must create a QApplication instance and only after this you can
> show widgets within it.
> 
> Here an example (main.py):
> 
> 
> from PyQt4.QtGui import QApplication
> from mywdg import MyWdg
> 
> class MainApp(QApplication):
>    def __init__(self, args):
>        QApplication.__init__(self, args)
>        wdg = MyWdg()
>        wdg.show()
>        self.exec_()
> 
> if __name__ == "__main__":
>        import sys
>    app = MainApp(sys.args)
> 
> 
> Then open a terminal and run: python main.py
> and if all went fine you can see your widget.
> 
> Cheers.
> 
> 
>> 
>> it give me a python crash ... obviously i'm missing something basilar,
>> 
>> have you any clue on what i need to change to have the example working
>> outside qgis ?
>> 
>> 
>> thanks a lot !!!
>> 
>> regards,
>> 
>> Massimo

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