NotImplementedException in fetch_buffer method

[jvieira88]

Describe the bug
Hi, I'm getting the following exception when trying to get an image using the fetch_buffer method:

Exception has occurred: NotImplementedException GenTL exception: Requested operation not implemented. (Message from the source: GC_ERR_NOT_IMPLEMENTED) (ID: -1003)

File "C:\Users\jv\source\repos\P1108_Rosalind\Rosalind\Camera\CoreCamera.py", line 110, in __init__
    arrFrame, oTimestamp = self.getLastFrame()
  File "C:\Users\jv\source\repos\P1108_Rosalind\Rosalind\Camera\CoreCamera.py", line 275, in getLastFrame
    buffer = self.m_oImageAcq.fetch_buffer()
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\harvesters\core.py", line 2563, in fetch_buffer
    logger=self._logger
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\harvesters\core.py", line 1094, in __init__
    logger=self._logger
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\harvesters\core.py", line 1227, in _build_payload
    buffer=buffer, node_map=node_map, logger=logger
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\harvesters\core.py", line 1403, in __init__
    buffer=buffer, node_map=node_map
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\harvesters\core.py", line 1326, in _build_component
    logger=self._logger
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\harvesters\core.py", line 834, in __init__
    self._data = self._to_np_array(proxy)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\harvesters\core.py", line 843, in _to_np_array
    nr_bytes += self._buffer.padding_y
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\genicam\gentl.py", line 4383, in _get_padding_y
    return _gentl.Buffer__get_padding_y(self)
_gentl.NotImplementedException: GenTL exception: Requested operation not implemented. (Message from the source: GC_ERR_NOT_IMPLEMENTED) (ID: -1003)

I'm not sure why this is happening, everything was working fine a couple of days ago. The camera is also working, tried using the manufacturer software successfully.

To Reproduce
This is how I call it, m_oImageAcq is an image acquirer that has been initialised:

def getLastFrame (self):
        m_arrLastFrame = np.zeros((1920, 1200))
        if not self.m_oImageAcq:
            return m_arrLastFrame
        
        if not self.m_oImageAcq.is_acquiring_images():
            return m_arrLastFrame
        
        buffer = self.m_oImageAcq.fetch_buffer()
        component = buffer.payload.components[0]
        # Reshape the NumPy array into a 2D array:
        m_arrLastFrame = component.data.reshape(component.height, component.width)
        logging.info("Image frame acquired")

        return m_arrLastFrame

Desktop:

• OS: Windows 10
• Python: 3.7
• Harvester: 1.2.3

[kazunarikudo]

@jvieira88 Hi. Thank you for the information. I have just committed the fix to branch _issue_172. Could you try that out and tell me if it fixed the issue, please? /Kazunari

[jvieira88]

@kazunarikudo Hi. Thanks for your quick fix. I confirm its working now 👍

[kazunarikudo]

@jvieira88 Hi. Thank you for taking your time on this issue. I have just merged the change into the master branch.