recognize_raw_image_func conflict with numpy

[cdavi014]

Hi, I am using a virtual python environment, and I have an issue where when I install Numpy and try to run openalpr, I get the following error:

File "/usr/local/lib/python2.7/site-packages/openalpr/openalpr.py", line 85, in __init__
    self._recognize_raw_image_func = self._openalprpy_lib.recognizeRawImage
  File "/usr/lib/python2.7/ctypes/__init__.py", line 375, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python2.7/ctypes/__init__.py", line 380, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/lib/libopenalprpy.so: undefined symbol: recognizeRawImage
Exception AttributeError: "Alpr instance has no attribute 'loaded'" in <bound method Alpr.__del__ of <openalpr.openalpr.Alpr instance at 0x7fe4cfcfa4d0>> ignored

I have identified the code in openlpr.py where it stems from:

        try:
            import numpy as np
            import numpy.ctypeslib as npct
            self._recognize_raw_image_func = self._openalprpy_lib.recognizeRawImage
            self._recognize_raw_image_func.restype = ctypes.c_void_p
            array_1_uint8 = npct.ndpointer(dtype=np.uint8, ndim=1, flags='CONTIGUOUS')
            self._recognize_raw_image_func.argtypes = [
                ctypes.c_void_p, array_1_uint8, ctypes.c_uint, ctypes.c_uint, ctypes.c_uint]
        except ImportError:
            self._recognize_raw_image_func = None

If I comment out the code, it works just fine. If I don't have Numpy installed it works just fine. I am not sure what I am doing wrong.

[r1me]

Hi, I've got the same issue.
Latest openalprpy.cpp does export recognizeRawImage. At the same time, latest release build actually does not export this function:

??0Alpr@alpr@@QAE@ABV01@@Z: 1
??4Alpr@alpr@@QAEAAV01@ABV01@@Z: 2
??_7Alpr@alpr@@6B@: 3
dispose: 4
freeJsonMem: 5
getVersion: 6
initialize: 7
isLoaded: 8
recognizeArray: 9
recognizeFile: 10
setCountry: 11
setDefaultRegion: 12
setDetectRegion: 13
setPrewarp: 14
setTopN: 15

Solved by rebuilding openalprpy with recognizeRawImage exported.

[iontom]

@r1me - what's the build process for openalprpy? I try running the make file but nothing changes.

[birolkuyumcu]

same issue with prebuild releases
first
dll file name is wrong

self._openalprpy_lib = ctypes.cdll.LoadLibrary("libopenalprpy.dll")
so openalprpy.dll renamed as libopenalprpy.dll
than

AttributeError: function 'recognizeRawImage' not found

rises
i try OpenALPR 2.3.0 and OpenALPR 2.2.0 release same
recognizeRawImage not exported

[avrcore]

Same Issue here. Is uninstalling numpy my only option? Is there another workaround? Took me 12h to boil it down to here...