Hi, just for my better understanding: is the "Add delimited text layer" at its end using libogr anyway? We use the Option - I just did not know about the "watch file" Option.
Does QgsMapLayerRegistry.instance().mapLayer(u'mylayer201509181234').triggerRepaint() reread the features of any filebased datasource (e.g. shape) as well? in that case it was very simple to create a watch-it plugin for any file-based vector-(and raster?)-datasource. Marco Am 18.09.2015 um 11:57 schrieb Andreas Neumann: > Hi Delazj, > > Yes - I was assuming that people would use the "Add delimited text layer > tool". Sorry - I forgot to mention that. It is more flexible and easier > to use than the "Add vector layer" dialogue. > > About CSV, joins and updates: have you checked the cache vs. uncached > option for your joins? > > Andreas > > On 18.09.2015 11:47, DelazJ wrote: >> Hi, >> Andreas, unless you add the csv file with "Add delimited text layer" >> tool, I'm afraid there's not a "watch file" option available. >> >> I just add a csv file to a qgis project with "add a vector layer" >> tool. I open the same csv in a text editor and change some values. >> While reopening the csv file attribute table in QGIS, values were >> already uptodate. I've done nothing special. So I'm not sure if QGIS >> requiers a particular action to sync data. >> But what seems buggy is that even if the csv file attribue table is >> updated in QGIS, if this csv was joined to a shapefile, the changes >> won't be applied in the shapefile's attribute table. Can someone confirm? >> I can't get changes with the "Refresh" button. >> >> Tested with qgis ltr 2.8.3 >> >> >> 2015-09-18 10:38 GMT+02:00 Andreas Neumann >> <<mailto:a.neum...@carto.net>a.neum...@carto.net>: >> >> Hi Marco, >> >> If you have the "watch file" option of your CSV file active it >> will reread data when file content changes and when your redraw >> your map (either through navigation or redraw button). >> >> I guess you could also write a small Python script if you want to >> automatically trigger an update at a given interval. Maybe there >> is already a plugin available - I did not look. >> >> Andreas >> >> >> On 18.09.2015 10:15, Dr. Marco Lechner wrote: >>> Hi Nicola, >>> >>> I guess this will only redraw the features in the mapcanvas, but not >>> necessarily read the datasource file, but I'm not sure about this. >>> >>> Marco >>> >>> Am 18.09.2015 um 10:02 schrieb Nicola Poles: >>>> To reload a CSV file you can press the Refresh button on the toolbar or >>>> press the "F5" key >>>> >>>> Nicola >>>> >>>> On Fri, Sep 18, 2015 at 9:16 AM, Dr. Marco Lechner <mlech...@bfs.de >>>> <mailto:mlech...@bfs.de> >>>> <mailto:mlech...@bfs.de> <mailto:mlech...@bfs.de>> wrote: >>>> >>>> Hi, >>>> >>>> how (often) does QGIS read features from a file (like csv or shape >>>> - >>>> differences?)? I realize I do not really know how the datasource - >>>> qgis- >>>> communication goes. >>>> >>>> Imaine you have a csv or shape file that is loaded into QGIS but is >>>> automatically replaced from time to time (or lets say externally >>>> edited). Using a database- instead of file-based approach is >>>> better for >>>> sure, but still it is not clear when / how often (on which events) >>>> QGIS >>>> requests features from the datasources. >>>> >>>> As an idea in mind I see, the nice Sync-Plugin >>>> (https://plugins.qgis.org/plugins/SyncQGISWithDir/) can monitor >>>> folders >>>> and notify the user if a new layer is available in a folder (well >>>> it >>>> does not take care of a changed layer (new timestamp of file, but >>>> adding >>>> this functionality should not be such a big thing). The user could >>>> also >>>> be notified when a layers file changed. >>>> >>>> But I'm not sure what was the best way to implement the >>>> (re)loading of >>>> an already loaded layer. Do I have to drop the layer and reload it >>>> (including keeping the style) or is there a more efficient way? >>>> >>>> Marco >>>> >>>> -- >>>> Dr. Marco Lechner >>>> Bundesamt fuer Strahlenschutz / Federal Office for Radiation >>>> Protection >>>> SW2.1 Koordination Notfallschutzsysteme / Coordination Emergency >>>> Systems >>>> Rosastrasse 9 | D-79098 Freiburg | Germany >>>> mlech...@bfs.de <mailto:mlech...@bfs.de> <mailto:mlech...@bfs.de> >>>> <mailto:mlech...@bfs.de> | +49 (0)3018 333 6724 >>>> <tel:%2B49%20%280%293018%20333%206724> >>>> <tel:%2B49%20%280%293018%20333%206724> | www.bfs.de >>>> <http://www.bfs.de> <http://www.bfs.de> <http://www.bfs.de> >>>> >>>> -- >>>> Hinweis zu Anhängen die auf .p7m/.p7c/.p7s oder .asc/.asc.sig >>>> enden: >>>> Die .p7?- und .asc-Dateien sind ungefährliche Signaturdateien >>>> (digitale >>>> Unterschriften). >>>> In E-Mail-Clients mit S/MIME Konfiguration (.p7?) oder >>>> PGP-Erweiterung >>>> (.asc) dienen sie zur: >>>> - - Überprüfung des Absenders >>>> - - Überprüfung einer evtl. Veränderung des Inhalts während der >>>> Übermittlung über das Internet >>>> Die Signaturdateien können ebenso dazu verwendet werden dem >>>> Absender >>>> dieser Signatur eine E-Mail mit verschlüsseltem Inhalt zu senden. >>>> >>>> In E-Mail-Clients ohne S/MIME Konfiguration oder PGP-Erweiterung >>>> erscheinen die Dateien als Anhang und können ignoriert werden. >>>> >>>> _______________________________________________ >>>> Qgis-user mailing list >>>> Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> >>>> <mailto:Qgis-user@lists.osgeo.org> <mailto:Qgis-user@lists.osgeo.org> >>>> http://lists.osgeo.org/mailman/listinfo/qgis-user >>>> >>>> >>>> >>>> >>>> _______________________________________________ Qgis-user >>>> mailing list Qgis-user@lists.osgeo.org >>>> <mailto:Qgis-user@lists.osgeo.org> >>>> http://lists.osgeo.org/mailman/listinfo/qgis-user >> >> >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> >> http://lists.osgeo.org/mailman/listinfo/qgis-user >> >> > > > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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