If you work with barcode or QR code processing in Python (using libraries like pyzbar , zbarlight , or pylibdmtx ), you may have encountered a frustrating runtime error:
import os os.add_dll_directory(r"C:\path\to\folder\containing\dll") # Python 3.8+ from pyzbar import pyzbar Or set the PATH environment variable inside your script: could not find module libzbar-64.dll
If you follow the steps above, your barcode reading script will run without further DLL‑related interruptions. If you work with barcode or QR code
Could not find module 'libzbar-64.dll' (or one of its dependencies). Try using the full path with constructor syntax. This error halts your script immediately, even if your Python code looks flawless. Below is a complete breakdown of why this happens and exactly how to fix it. libzbar-64.dll is a dynamic link library (DLL) file for ZBar , an open-source software suite for reading barcodes and QR codes from images. The "64" indicates it’s the 64-bit version of the library. This error halts your script immediately, even if
import sys sys.path.append(r"C:\path\to\dll\folder") Alternatively, some libraries allow explicit DLL path assignment: