 <p>I added a project file and some other small changes which are needed to build ZXing.Net for PCL. You can get it from the source code repository at codeplex. You have to build your own version because at the moment there is no pre built binary. Next version will include it. The restriction of the PCL version is that you have to deal with RGB data. You can't use platform specific classes like Bitmap, WriteableBitmap, BitmapSource or Color32.</p>