dll - Retrieve C++ camera image via python interface: can't access image data - Stack Overflow

I am trying to talk to a C++ SDK controlled camera (brand: SVS with framegrabber) and to retrieve images from it to process in my python code. The camera uses a buffer structure. And here's the code I'm currently using to extract the image data.

def acquiring_imaging(self, stream_handle):
    """Main loop for continuously acquiring and processing images."""
    while self.acquiring:
        buffer_handle, result = self.wait_for_new_buffer(stream_handle, 1000000)
        if result == 0:  # New buffer received
            buffer_info, result = self.get_buffer_info(stream_handle, buffer_handle)
            if result != 0:  # Failed to retrieve buffer info
                continue
            self.queue_buffer(stream_handle, buffer_handle)
            if buffer_info.pImagePtr:
                imagedata = ct.cast(buffer_info.pImagePtr,
                                    ct.POINTER(ct.c_ubyte * buffer_info.iImageSize))
                self.image = np.ndarray(buffer=imagedata.contents, dtype=np.uint8,
                                        shape=(buffer_info.iSizeY, buffer_info.iSizeX, 1))[:, :, 0]
                print(self.image)
        elif result == CameraError.SV_ERROR_TIMEOUT:  # Timeout
            self.buffer_updated = False
            continue

However, the program stop with no error reports when I try to print the self.image. But I was able to print the size of the self.image, and it seems to be all correct. Any help is appreciated!

I have also tried to save the image via a C++ function hard built into the SDK.

if not buffer_info.pImagePtr or buffer_info.iImageSize == 0:
    print("ERROR: Invalid Image Pointer or Image Size is 0!")
# Define function signature
self.sv_dll.SVUtilSaveImageToFile.argtypes = [ct.POINTER(SV_BUFFER_INFO), ct.c_char_p, SV_IMAGE_FILE_TYPE]
self.sv_dll.SVUtilSaveImageToFile.restype = ct.c_int  
# Convert filename to ctypes-compatible format
print(buffer_info.pImagePtr)
file_name = "C://Users//folder//graph.png"
file_name = file_name.encode("utf-8")
file_name_bytes = bytes(memoryview(file_name))
info_ref = ct.byref(buffer_info)
print(f'{info.pImagePtr}')
self.sv_dll.SVUtilSaveImageToFile(info_ref, file_name_bytes, SV_IMAGE_FILE_TYPE(SV_IMAGE_FILE_TYPE.PNG))
try:
    self.sv_dll.SVUtilSaveImageToFile(info_ref, file_name_bytes, SV_IMAGE_FILE_TYPE(SV_IMAGE_FILE_TYPE.PNG))
except OSError:
    print(buffer_info.pImagePtr)

However, this always give me an OS error claiming that I'm accessing the wrong memory space. Further, the info.pImagePtr changes after I call the function SVUtilSaveImageToFile. I suspect some sort of memory leak issue but I'm not sure how to fix it.