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You do have the option to take the 4-hour practical instead of the multiple guess to recert. So if you are confident in your practical test taking, you might want to consider that.

The Bitmap constructor is part of .net, not the zxing lib; look for System.Drawing.Bitmap If your webcam exports an image, you would have to convert that to a bitmap or look through the zxing API for a method that accepts an image. I played around with rotating my 1D barcodes and found that if you cannot draw a horizontal or vertical line that passes through all of the elements of the barcode, you will fail to decode. 2D QR codes worked without a problem. The decode method returns a Result object; use the properties to retrieve the result points and metadata. You might need to iterate over the metadata object to get the key/value pairs. I've attached the VI with the all of the .NET closes as pointed out in the thread. I still work in LV 8.6 and that is limited to .NET 2.0 so that's what I've posted here. Place it in the same folder as the zxing .net 2.0 DLL and it should 'just work'. zxing.net Read Barcode.vi

ZZZ, To allow the PAUSE button to stop the loop, you need to change the behavior of the RUN button event case so that it doesn't lock the front panel. Right click on the "RUN": Mouse Down event and select Edit Events Handled by this Case. Unselect the Lock Front Panel box at the lower left of the Edit Events window. With this selected (the default condition), the program won't process the PAUSE button press (or any other button press) until the loop stops. Steve

I really wish the LabVIEW picture control would be improved. It scales vector based images just fine but does so horribly for raster content. When you look at performance considerations the opposite is true: it can handle huge raster images, but even a moderate amount of vector content absolutely kills any hope of having a fluid experience.