Error Reporting¶

When an eVision function fails, it throws an exception that contains an error code and a description.

eVision code throws exceptions of type EException ^.NET ^Python.
To catch a potential exception, include the function call in a try-catch block.

C++

#include <eVision/Easy/EImageC24.h>

using namespace eVision;
try
{
  // Image constructor
  EImageC24 srcImage;
  // ...
  // Retrieve the pixel value at coordinates (56, 73)
  EC24 value = srcImage.GetPixel(56, 730);
}
catch (EException exc)
{
  // Retrieve the exception description
  std::string error = exc.What();
}

using eVision;

try
{
  // Image constructor
  EImageC24 srcImage = new EImageC24();
  // ...
  // Retrieve the pixel value at coordinates (56, 73)
  EC24 value = srcImage.GetPixel(56, 73);
}
catch (EException exc)
{
  // Retrieve the exception description
  string error = exc.What();
}

Python

import eVision
try:
    # Image constructor
    src_image = eVision.EImageC24()
    # ...
    # Retrieve the pixel value at coordinates (56, 73)
    value = src_image.GetPixel(56, 73)
except eVision.EException as e:
    # Retrieve the exception description
    error = str(e)