Questions tagged [pyqt]
PyQt provides bindings for Qt 2 and Qt 3.
47
questions
17
votes
11
answers
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views
QGIS plugin: Problems importing resources (resources_rc) file - plugin doesn't load - PATH problems?
I'm building qgis plugin and I can't find solution for this error.
File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 478, in _import
mod = _builtin_import(name, globals, locals, ...
- 551
13
votes
4
answers
10k
views
Developing GUI in Python for ArcGIS geoprocessing using PyQT/Tkinter/wxPython?
I want to develop a GUI in Python for ArcGIS geoprocessing.
Can I use PyQT for GUI programming in ArcGIS?
I have also considered using Tkinter and wxPython.
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6
votes
2
answers
3k
views
Usage of QgsTask and QgsTaskManager
I'm trying to test the new QgsTask and QgsTaskManager, I found some examples in the PullRequest in github. I modified it slightly and added a print(i) in the code bellow:
from qgis.core import ...
- 2,074
2
votes
1
answer
2k
views
Capturing mouse movement on QgsMapCanvas?
I have a python app that uses QgsMapCanvas as map display. I put it inside a QWidget, which is then inside another control. The problem is that there seems to be no way of tracking mouse move event on ...
- 1,115
8
votes
3
answers
5k
views
How to use Threads in PyQgis, mainly to keep UI active?
I'm trying to develop a plugin, which does heavy computations and as a result, user interface becomes inactive. I know that I should use threads to keep the UI alive (specifically, I have a progress ...
- 937
5
votes
1
answer
3k
views
Work around for “Couldn’t load PyQt” error with QGIS 3.0.3 on Ubuntu 18.04?
I am working with a fresh install of Ubuntu 18.04 and installed QGIS using https://qgis.org/debian. I get the following error when I launch QGIS:
Couldn't load PyQt.
Python support will be disabled.
...
- 65
5
votes
2
answers
826
views
Properter to get travel time as cost for network analysis
What I want to do is calculate travel times between points within a road network. I know there are options with GRASS (via v.net) and pgRouting (and possibly many more). I intent to stick to the ...
4
votes
2
answers
3k
views
Looking for manual on how to properly setup standalone PyQGIS without GUI
My goal is to create a standalone PyQGIS script that is able to run QgsProcessingAlgorithm scripts without GUI. My setup runs on Windows and my IDE of choice is VS Code.
I've followed the Windows ...
- 523
4
votes
1
answer
2k
views
PyQGIS reload a QGIS plugin
I have a plugin that has a psycopg2 connection to a PostGIS database. When i close GUI with the X-Button and open it again, all the widgets are filled with the data from before. It looks like the X is ...
- 2,918
3
votes
2
answers
2k
views
Segmentation fault (core dumped) QgsApplication
import os, os.path,sys
from qgis.core import *
from qgis.gui import *
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class MapExplorer(QMainWindow):
def __init__(...
- 141
2
votes
1
answer
3k
views
QGIS 2.99 "qgis._core import error: DLL load failed"
I am trying to run a standalone application. However, it does not run the program because of mentioned error in title. Here is my code:
from qgis.core import *
from qgis.gui import *
from qgis.utils ...
- 1,591
1
vote
2
answers
3k
views
QGIS 2.4 - Python 2.7 PyQT4.Qtcore.QStringList Import failed
I receive an import error when trying to import QStringList from the QGIS Python console (or when loading a custom plugin).
from PyQt4.QtCore import QStringList
Traceback (most recent call last):
...
- 415
0
votes
1
answer
130
views
Install and run GDBee file geodatabase SQL tool
GDBee is a Python tool for querying file geodatabases using SQL (outside of ArcGIS): https://github.com/AlexArcPy/GDBee
I want to install and run GDBee in Windows 10 (64-bit). As a novice, here's what ...
- 1,222
8
votes
2
answers
1k
views
Remove "Save As" from QGIS Context Menu Using PyQGIS [closed]
I want to remove an existing option ("Save As") from context menu of QGIS layer, what I have found so far is, to add new action in the LegendItems, or overwrite completely with new options. But could ...
- 2,281
8
votes
2
answers
6k
views
QGIS relations widget in custom form
I've just begun exploring QGIS relations option, now in version QGIS 2.2, details here: http://blog.vitu.ch/10112013-1201/qgis-relations
This is a great implementation of something I've been ...
- 2,125
8
votes
1
answer
22k
views
How to fix 'Could not find the Qt platform plugin “Windows” in “”' when implementing qgis in custom Python3 application?
I am implementing qgis 3.4.3 in a custom application, but when I instantiate the QgsApplication() class, I receive the error "Could not find the Qt platform plugin "Windows" in "".
I've attempted ...
- 405
7
votes
1
answer
542
views
Get xy coordinates of QgsMapCanvas in PyQGIS 3?
I am trying to get the QgsMapCanvas coordinates when they change using PyQt5 and PyQGIS 3. What I have used for that:
self.canvas.scaleChanged.connect(lambda: self.showScale(self.canvas.scale()))
...
- 187
7
votes
1
answer
922
views
Moving cursor using PyQGIS?
I would like to move the cursor to a given x,y coordinates of the MapCanvas.
Is there an easy way to do this using PyQGIS?
- 5,743
6
votes
1
answer
682
views
Running function from double click with PyQGIS
How can a double-click in the QGIS canvas be used to run a function in PyQGIS?
For example, I want to access the name of each feature I'm selecting with a double-click.
Code sample to access the ...
- 2,130
6
votes
2
answers
258
views
What is QDomNode and QDomDocument in terms of PyQGIS?
On a low level what is QDomNode and QDomDocument in the PyQGIS context?
I comprehend that both QDomNode and QDomDocument are derived from PyQt. Hence, with my limited knowledge of PyQt, I simply do ...
- 33.7k
6
votes
1
answer
2k
views
how to open second window in my plugin for QGIS?
I create a Mainwindow for my plugin, but if I want to open a second window from this Mainwindow, with click on push button. How can I do?
I tried the following function in my Main Class:
dialog = ...
- 83
6
votes
1
answer
3k
views
Adding a Tiles/wms? (openStreetMap) layer with python in QGIS
In my QGIS python plugin I want to add a background map (if the user haven't added one), hence I think I missing something in the url for the Tiles/wms service.. (the function returns invalid layer) ...
- 2,074
5
votes
3
answers
4k
views
Should you switch from ArcMap to QGIS? [closed]
Background:
Our group has full ESRI licenses and applications built with ArcGIS Desktop.
We are invested in the arc geodatabase itself and will not change that tier.
There is a proposal to switch ...
- 463
5
votes
4
answers
1k
views
QGIS Plugin with save settings dialog
I am writing on an update of the qgis2leaf plugin.
It would be great to store the settings of the plugin UI (like which checkboxes are checked, which strings are used) in a separate file (like xml or ...
- 2,678
5
votes
1
answer
1k
views
How to create sub-menus in QGIS 3 plugin
I'm trying to create a sub-menu in a QGIS plugin like in the image. I found this Add extra item to drop down menu plugin. "Layers menu from project" plugin but I'm using QGIS 3 and PyQT5 and ...
- 1,085
5
votes
1
answer
1k
views
Add extra item to drop down menu plugin. "Layers menu from project" plugin
I have created a drop down menu in QGIS. The code is mainly from the "Layers menu from project" plugin. I have cleaned it so it only have the drop down.
My problem is that I will like to add an ...
- 611
5
votes
1
answer
2k
views
Download file from network using PyQGIS 2.x
I have a python plugin targeting QGIS 1.8 that uses QgsNetworkAccessManager and QNetworkRequest to issue a GetCapabilities request to WMS servers.
With 1.8 everything was working fine. Now we are ...
- 1,494
5
votes
1
answer
3k
views
Using PyQGIS in standalone scripts without crashing
I am new to the PyQGIS API.
For developing I use my Spyder IDE with QGIS and GRASS modules. In order to make my script executable I just run my code with the QGIS python.exe in my bat file. This all ...
- 437
5
votes
1
answer
347
views
Referencing Qt UIs external to plugin with python
I'm developing a plugin that sets up a working environment for a user: loading layers (from db), applying styles and several custom designed (Qt) UI files etc.
Primary user interaction is in the ...
- 83
5
votes
1
answer
379
views
Collapsing legend in ToC via PyQGIS
I am creating QGIS simple plugin which adds and set styles. It works like a charm, however i want to collapse all legends(categories) from styles in given layer i tried
layer....
- 133
4
votes
1
answer
1k
views
How to add loading bar in QGIS Plugin development?
Every time i use tool or plugin in QGIS, i saw a kind of bar like this for indicating loading progress :
The different between that bar and Progress Bar is that progress bar will increase until our ...
- 712
4
votes
1
answer
882
views
How to connect QgsMapLayerComboBox to QgsDataDefinedButton
in Qt Designer there is the possibility to use directly QGIS custom widgets.
In the UI I added a QgsMapLayerComboBox (to get the layers added in the legend) and a QgsDataDefinedButton.
What I would ...
- 3,304
3
votes
1
answer
707
views
Using QGIS modules in standalone application with PySide?
I want to make small standalone application using PySide and QGIS Python modules to display satellite images and do standard GIS operations, like creating new a shapefile and placing polygons or ...
- 83
3
votes
1
answer
13k
views
How to position the Qwidget form/QDialogBox in the left corner using python programming
1) I am creating a Qwidget Form or QDialogBox using QT Designer. I am using the following code to move the form:
sDialog.move(50,450)
But i want to fit the dialogBox to fit in the left corner.How ...
- 989
3
votes
0
answers
603
views
QGIS QgsAttributeTableModel only loads when called without a function in Python
I tried to load QgsAttributeTableModel into QgsAttributeTableView or a plain Qt QTableView but it could run from inside a class method or function but it runs without any function or method. Below is ...
- 1,383
3
votes
1
answer
2k
views
PyQGIS - QgsMapToolEmitPoint
I would like to make use of Signal and Slot while using PyQgis along with PyQt4.
Despite spending some time trying out tutorials and some somewhat related post on gis.stackexchange I can't figure out ...
- 415
3
votes
0
answers
2k
views
Canceling task currently running in background using PyQGis?
I am trying to close QgsProject on loading layer (if password and username from QgSProject - datasource are incorrect) before QgsCredentialDialog is shown.
on signal :
QgsProject.instance()....
- 942
2
votes
2
answers
699
views
QGIS' pyrcc5 gives error on macos Catalina
When trying to build a QGIS plugin with Plugin Builder 3, I get the message that pyrcc5 was not found in my path.
I installed PyQt using brew install pyqt, but still nothing. Instead, I tried to run ...
- 131
2
votes
2
answers
3k
views
PyQT: QFileDialog keeps on opening window after clicking on cancel or ok
I use to write QGis plugins, which is based on PyQT.
I use to create QButtons and connect their click to a function that itself calls a QFileDialog.
For example:
def doOpenFile(self):
fname =...
- 881
2
votes
0
answers
278
views
QPyNullVariant not recognized outside of QGIS [duplicate]
I'm getting an error about an operation involving a QPyNullVariant:
TypeError: unsupported operand type(s) for *: 'QPyNullVariant' and 'float'
I wanted to put a check into my code to skip these ...
- 313
2
votes
2
answers
5k
views
How to draw a Circle of fixed radius in QGIS using QgsMapCanvasItem?
I have derived a class from QgsMapCanvasItem for drawing circle of some radius at a given latitude and longitude.
In my paint function I am using QPainter to draw the circle as
void paint (QPainter* ...
- 121
2
votes
1
answer
687
views
How to get a group layer delete signal in QGIS
I'm developing a plugin into QGIS 2.18. I need to catch if the user deletes a group layer. I tried the signal layerWillBeRemoved from QgsMapLayerRegistry class but it sends only layers not group layer....
- 180
1
vote
1
answer
2k
views
Layer properties dialog in my QGIS plugin [closed]
I am developing a plugin which should display some information like geometry of the layer, feature count etc. Now those are currently displayed in QMessageBox.information. I want it to be displayed ...
- 2,986
1
vote
0
answers
1k
views
Overlaying Google Map in standalone PyQgis application? [closed]
I have created a standalone PyQGIS app (within Python itself, not a plugin) with PyQt and PyQGIS API. It generates my map really well. I would like to overlay a Google Map layer as base map just like ...
1
vote
1
answer
490
views
Why does QGIS 2.4 prematurely terminates on startup at "Starting Python"?
After reinstalling Python (3.4) as well as OSGeo4W and the QGIS Standalone, my QGIS always crashed when "Starting Python" on my Windows 7 64 Bit environment. It simply did not proceed to the QGIS-GUI ...
- 243
1
vote
1
answer
289
views
GIS Action that loads a raster, creates pyramids and sets color
Using the code in "Developing QGIS Action which loads a raster".
from PyQt4.QtCore import QFileInfo,QSettings
from qgis.core import QgsRasterLayer, QgsCoordinateReferenceSystem
s = QSettings()
...
- 919
0
votes
1
answer
192
views
Creating QGIS Shapefile in PyCharm leaving some attributes NULL
I've created the shapefile and can manually enter in all the attributes to come in fine, but when I call it any other way (which I will need to do), the values for the floating types appear as NULL, ...
- 151