将numpy数组转换为cython指针 [英] convert numpy array to cython pointer

问题描述

我有一个来自cv2.imread的numpy数组，所以dtype = np.uint8和ndim = 3也是如此.

I have a numpy array which came from a cv2.imread and so has dtype = np.uint8 and ndim = 3.

我想将其转换为Cython unsigned int*，以便与外部cpp库一起使用.

I want to convert it to a Cython unsigned int* for use with an external cpp library.

我正在尝试cdef unsigned int* buff = <unsigned int*>im.data，但是出现错误Python objects cannot be cast to pointers of primitive types

I am trying cdef unsigned int* buff = <unsigned int*>im.data however I get the error Python objects cannot be cast to pointers of primitive types

我在做什么错了?

谢谢

推荐答案

感谢您的评论.解决方法:

thanks for your comments. solved by:

cdef np.ndarray[np.uint32_t, ndim=3, mode = 'c'] np_buff = np.ascontiguousarray(im, dtype = np.uint32)
cdef unsigned int* im_buff = <unsigned int*> np_buff.data

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