NationalInstruments.Vision.VisionException

I'm currently launching the code reader barcode and get this exception NationalInstruments.Vision.VisionException

Here is the code

Public Shared Function ProcessImage (ByRef image As VisionImage) As PaletteType
'Initialize the IVA_Data structure for the results and coordinate systems.
Dim ivaData As New IVA_Data (1, 0)
            
' Creates an empty region of interest.
Sun King as new Roi()
' Creates a new RotatedRectangleContour with the given values.
Dim vaCenter As New PointContour (243, 181.5)
Dim vaRotatedRect As New RotatedRectangleContour (vaCenter, 140, 111, 317.6)
return on investment. Add (vaRotatedRect)
' Reads the barcode on the image.
vaBarcode = Algorithms.ReadBarcode (image, BarcodeTypes.Code128, King, False)
            
return on investment. Dispose()
            
"Eliminating the IVA_Data structure.
ivaData.Dispose)
            
' Return the type of range of the final image.
return PaletteType.Gray

End Function

Thank you

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Hi mreuveni,

The exception may be thrown for various reasons such as the image is not a barcode or attempt to ReadBarcode of the type false image. You read the same image that you use in the Vision Assistant and the Barcode Read in WILL read the code correctly barcode? Here is a screenshot which should help us determine what exception is thrown. Try to add the

Try

* FUNCTION *.

Catch ex As Exception

End Try

As seen in the attached screenshot and adding a breakpoint on the line to Catch * then view the exception details to see the VisionErrorText. This example was when I tried to read a solid black image.

DylanC

Tags: NI Software

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