QGIS Promptly sample

qqgis_promptly_sample.txt

prompt=voeg D:\gisdata\andorra\ALPSMLC30_N042E001_DSM.tif toe aan qgis

Please follow these guidelines when generating QGIS code:

1. Always include necessary QGIS imports at the top of your code (note the correct locations):
   - from qgis.core import QgsProject, QgsVectorLayer, QgsCoordinateReferenceSystem, Qgis
   - from qgis.utils import iface
   - from PyQt5.QtCore import Qt, QVariant
   - from PyQt5.QtGui import QColor
   - from PyQt5.QtWidgets import QMessageBox, QInputDialog, QDialog, QComboBox

2. IMPORTANT IMPORT RULES:
   - Qgis (with the enums like Qgis.Info) is imported from qgis.core, NOT from PyQt5
   - Message bars are accessed through iface.messageBar(), NOT through a QgsMessageBar class

3. When your code involves modifying the map canvas or project:
   - Reference the current project with QgsProject.instance()
   - Use iface for user interface operations
   - Always call refresh operations like iface.mapCanvas().refresh() when making visual changes
   
4. For adding layers to the map:
   - Use QgsProject.instance().addMapLayer(layer) or addMapLayers([layers])
   - Ensure layers have proper CRS settings
   
5. For user notifications:
   - Use iface.messageBar().pushMessage("Title", "Message", level=Qgis.Info)
   - Do NOT use QgsMessageBar directly
   
6. For USER INTERACTION and LAYER SELECTION:
   - If a specific layer has been pre-selected in the dropdown, use that layer directly
   - For additional layer selection needs, allow the user to select a layer using:
     ```python
     layer_names = [layer.name() for layer in QgsProject.instance().mapLayers().values()]
     layer_name, ok = QInputDialog.getItem(None, "Select Layer", "Choose a layer:", layer_names, 0, False)
     if ok and layer_name:
         selected_layer = next((layer for layer in QgsProject.instance().mapLayers().values() if layer.name() == layer_name), None)
         if selected_layer:
             # Proceed with the selected layer
     ```
   
7. USING THE SELECTED LAYER:
   - If a layer has been pre-selected in the dropdown, access it directly with:
     ```python
     # Get the selected layer by name
     layer_name = "LAYER_NAME_HERE"  # Replace with the name from the metadata
     selected_layer = None
     for lyr in QgsProject.instance().mapLayers().values():
         if lyr.name() == layer_name:
             selected_layer = lyr
             break
             
     if selected_layer:
         # Work with the selected layer
         # Example: count features, process attributes, etc.
     else:
         iface.messageBar().pushMessage("Error", f"Layer '{layer_name}' not found", level=Qgis.Warning)
     ```
   
8. When executing complex operations:
   - Consider wrapping in try/except blocks
   - Add progress messages for user feedback
   
Provide complete, self-contained code that will run in the QGIS Python environment.