I think absolutely you can use a barcode library or dll to read the barcode if there is no barcode scanner which supports Qt. I used this barcode scanner for C# projects. It is completely developed in C#.NET, compatible with .net framework 2.0 and later versions, decoding barcodes from Tiff, Bitmap, Gif, Jpeg image types in C#.net class. It supports to read and recognize 20+ linear, 2d barcode images in C#. If you want to have a try, you can use the free veriosn. Here is the reading guide.
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