DLL Problems - DLL load failed -> QtCore

Beersky

Hello,
I've migrated from PyQt5 to PyQt6 and rewrote the code, but I'm encountering the issues while running the interface.
Venv: Python 3.9
PyQt6 version = 6.9.1
PyQt6-Pq6 = 6.9.1
IDE - Pycharm

Here's the error message:

Traceback (most recent call last):
  File "C:\Users\binkjac\Documents\Project\Lab_Project\epcm_control_source 1\gui.py", line 4, in <module>
    from PyQt6.QtCore import QTimer
ImportError: DLL load failed while importing QtCore: The specified procedure could not be found.

Source Code:


import sys
import configparser
from PyQt6.QtCore import QTimer
from PyQt6.QtWidgets import (QApplication, QMainWindow, QTextEdit, QComboBox,
                             QPushButton, QVBoxLayout, QWidget, QHBoxLayout, QLabel,
                             QLineEdit, QMessageBox,QFileDialog)
from PyQt6.QtCore import QThread, pyqtSignal, QTimer
from PyQt6 import uic
from pyModbusTCP.client import ModbusClient
from output_widget import OutputLabel, Clients
from ok_bad_indicator import OBIndicator
from protocol import protocol

# Load config.ini
config = configparser.ConfigParser()
config.read("config.ini")

# Create application and load UI
app = QtWidgets.QApplication(sys.argv)
window = uic.loadUi("EPCMgui.ui")

# Find IP input fields and button
pwr_ip_edit = window.findChild(QtWidgets.QLineEdit, "pwrIpEdit")
dio_ip_edit = window.findChild(QtWidgets.QLineEdit, "dioIpEdit")
save_ip_button = window.findChild(QtWidgets.QPushButton, "saveIpButton")

# Load IPs from config
pwr_addr = config.get("interface", "pwr", fallback="192.168.1.252")
dio_addr = config.get("interface", "dio", fallback="192.168.1.251")
pwr_ip_edit.setText(pwr_addr)
dio_ip_edit.setText(dio_addr)

# Create Modbus clients
pwr_client = ModbusClient(host=pwr_addr, port=502, auto_open=True)
disc_client = ModbusClient(host=dio_addr, port=502, auto_open=True)

# Assign clients to OutputLabel widgets
for widget in window.findChildren(OutputLabel):
    widget.client = Clients.PWR if "pwr" in widget.objectName() else Clients.DISC
    widget.modbusaddress = int(protocol.get(widget.objectName(), {}).get("address", 0))
    widget.dimension = protocol.get(widget.objectName(), {}).get("unit", "")
    widget.type10 = protocol.get(widget.objectName(), {}).get("type", OutputLabel.Value)

# Update IP addresses dynamically
def update_ip_addresses():
    new_pwr_ip = pwr_ip_edit.text()
    new_dio_ip = dio_ip_edit.text()
    config["interface"]["pwr"] = new_pwr_ip
    config["interface"]["dio"] = new_dio_ip
    with open("config.ini", "w") as configfile:
        config.write(configfile)
    pwr_client.host(new_pwr_ip)
    disc_client.host(new_dio_ip)
    print("Updated IPs:", new_pwr_ip, new_dio_ip)

save_ip_button.clicked.connect(update_ip_addresses)

# EPCM Power Control Logic
epcm_button = window.findChild(QtWidgets.QPushButton, "epcmSSPowButtonON")
epcm_confirm = window.findChild(QtWidgets.QPushButton, "epcmSSPowConfirmButton")

def enable_confirm():
    epcm_confirm.setEnabled(True)

def confirm_power_on():
    disc_client.write_single_coil(11, True)
    epcm_confirm.setEnabled(False)

epcm_button.clicked.connect(enable_confirm)
epcm_confirm.clicked.connect(confirm_power_on)

# Periodic update
def update_widgets():
    for widget in window.findChildren(OutputLabel):
        widget.update()
    # Update indicators
    window.findChild(OBIndicator, "fpmIntInd").ok = pwr_client.is_open()
    window.findChild(OBIndicator, "fpmCommsInd").ok = pwr_client.is_open()
    window.findChild(OBIndicator, "ioIntInd").ok = disc_client.is_open()
    window.findChild(OBIndicator, "ioCommsInd").ok = disc_client.is_open()

timer = QTimer()
timer.timeout.connect(update_widgets)
timer.start(1000)

# Show window
window.show()
sys.exit(app.exec())

Visual Studio Redistributables installed, PyQt6 re-installed multiple times, Python3.dll and Python39.dll present in the Venv Scripts folder - I'm slowly loosing hope.

Beersky

Found the solution. PyQt6 6.9.1 is not compatible with Python below 3.10. Updating python version helped.

Leaving for the future researchers.

hskoglund

Hi maybe an advice from this old thread might helplink text

Beersky

Found the solution. PyQt6 6.9.1 is not compatible with Python below 3.10. Updating python version helped.

Leaving for the future researchers.