QGIS Processing Plugin: Setting input and output directory

Question

I would like to connect my input and output directories, as well as my input file 'boundary layer' within my processing plugin. My plugin appears like this:

enter image description here

My plugin.py file is depicted below:

import os
import sys
import inspect
from qgis.PyQt.QtWidgets import QAction, QFileDialog
from qgis.PyQt.QtGui import QIcon
from qgis.core import QgsProcessingAlgorithm, QgsApplication, Qgis, QgsProject
import processing
from .GET_provider import GETProvider
from PyQt5.QtCore import QSettings, QTranslator, qVersion, QCoreApplication
cmd_folder = os.path.split(inspect.getfile(inspect.currentframe()))[0]
if cmd_folder not in sys.path:
 sys.path.insert(0, cmd_folder)
class GETPlugin(object):
 
 def __init__(self, iface):
 self.provider = None
 self.iface = iface
 #self.dlg =GETDialog()
 #self.dlg.pushbutton.clicked.connect(self.reproject)
 def initProcessing(self):
 """Init Processing provider for QGIS >= 3.8."""
 self.provider = GETProvider()
 QgsApplication.processingRegistry().addProvider(self.provider)
 def initGui(self):
 self.initProcessing()
 
 icon = os.path.join(os.path.join(cmd_folder, 'logo.png'))
 self.action_1 = QAction(
 QIcon(icon),
 u"GE_S", self.iface.mainWindow())
 self.action_1.triggered.connect(self.runAlg_1)
 self.iface.addPluginToMenu(u"&GE", self.action_1)
 self.iface.addToolBarIcon(self.action_1)
 self.action_2 = QAction(
 QIcon(icon),
 u"GE_CD", self.iface.mainWindow())
 self.action_2.triggered.connect(self.runAlg_2)
 self.iface.addPluginToMenu(u"&GE", self.action_2)
 self.iface.addToolBarIcon(self.action_2)
 def unload(self):
 QgsApplication.processingRegistry().removeProvider(self.provider)
 self.iface.removePluginMenu(u"&GE", self.action_1)
 self.iface.removePluginMenu(u"&GE", self.action_2)
 self.iface.removeToolBarIcon(self.action_1)
 self.iface.removeToolBarIcon(self.action_2)
 
 def runAlg_1(self):
 processing.execAlgorithmDialog("GE:GE_S")
 def runAlg_2(self):
 processing.execAlgorithmDialog("GE:GE_CD")
 
 def reproject(self):
 data_dir = "C:/Downloads/Inputs"
 output_dir="C:/Downloads/Outputs"
 filename = "Boundary.shp"
 Boundary = os.path.join(data_dir,filename)
 filename = "RT_LE07_L1TP_194051_20001024_20170209_01_T1_2000年10月24日_B3.tif"
 Landsat_Image1_NIR= os.path.join(data_dir, filename)
 processing.runAndLoadResults("gdal:warpreproject",{'INPUT':Landsat_Image1_NIR,'SOURCE_CRS':None,'TARGET_CRS':QgsCoordinateReferenceSystem('EPSG:32630'),'RESAMPLING':0,'NODATA':None,'TARGET_RESOLUTION':None,'OPTIONS':'','DATA_TYPE':0,'TARGET_EXTENT':None,'TARGET_EXTENT_CRS':None,'MULTITHREADING':False,'EXTRA':'','OUTPUT':os.path.join(output_dir,'Landsat_Image1_NIR_repr.tif')}) 

My script which I want to run is under 'def reproject' (I just want to reproject this file). How do I connect my input and output directories and my boundary layer with the plugin?

Answer 1

Answer: The easiest way to connect the two aspects, is to first create the interface in Qt designer, name all features and connect them with .clicked.connect()