ZBar is an open source software suite for reading bar codes from various sources, such as video streams, image files and raw intensity sensors. It supports many popular symbologies (types of bar codes) including EAN-13/UPC-A, UPC-E, EAN-8, Code 128, Code 39, Interleaved 2 of 5 and QR Code.
Follows help steps to scan Zbar barcode
Navigate to device screen from which to scan, it is scanning detect things like camera
When click [scan] button in control panel, it changed to black screen and hang