Using PyScripter with QGIS

This is a solution contributed by Andreas (github user name amr).  For a complete integration of PyScripter with QGIS you need two things:

1. Batch-File: The following is for the LTR-version of QGIS. It is a modified version of the existing python-qgis-ltr.bat in the folder "OSGeo4W\bin". Some changes were made to it, essentially using absolute paths to both the OSGeo4W and PyScripter installation folders. Please change the paths, if yours differ!

 

@echo off
:: path for OSGeo4W/QGIS
set O4W=C:\OSGeo4W
:: path for PyScripter
set PYSC=C:\Program Files\PyScripter

:: changed start procedure
call "%O4W%\bin\o4w_env.bat"
@echo off
:: add python dir to path
path %OSGEO4W_ROOT%\apps\qgis-ltr\bin;%OSGEO4W_ROOT%\apps\Python39;%PATH%
set QGIS_PREFIX_PATH=%OSGEO4W_ROOT:\=/%/apps/qgis-ltr
set GDAL_FILENAME_IS_UTF8=YES
rem Set VSI cache to be used as buffer, see #6448
set VSI_CACHE=TRUE
set VSI_CACHE_SIZE=1000000
set QT_PLUGIN_PATH=%OSGEO4W_ROOT%\apps\qgis-ltr\qtplugins;%OSGEO4W_ROOT%\apps\qt5\plugins
set PYTHONPATH=%OSGEO4W_ROOT%\apps\qgis-ltr\python;%PYTHONPATH%

:: start PyScripter
start "PyScripter" /B "%PYSC%\PyScripter.exe" --PYTHON39 --pythondllpath=%OSGEO4W_ROOT%\apps\python39 %*

2. Start-Script for the Python-Interpreter: It uses the path variable and adds each path to the DLL-search path. Store this as "sitecustomize.py" into the folder OSGeo4W\apps\Python39

#sitecustomize.py
import os
for p in os.getenv("PATH").split(";"):
    if os.path.exists(p):
        os.add_dll_directory(p)