如何获取C的numpy数组的内存地址 [英] how to get the memory address of a numpy array for C

问题描述

我构造了一个numpy数组:

I constructed an numpy array::

a=np.ndarray([2,3]) 

那我想看看它的数据在哪里:

then i want to see where its data are::

a.data 
>>>Out[213]: <read-write buffer for 0x0482C1D0, size 48, offset 0 at 0x049E87A0> 
a.data 
>>>Out[214]: <read-write buffer for 0x0482C1D0, size 48, offset 0 at 0x049E82A0> 
a.data 
>>>Out[215]: <read-write buffer for 0x0482C1D0, size 48, offset 0 at 0x049E81C0> 

...

为什么每次偏移地址都不相同? 如果我想通过以下方式使用c_types将数据传输到c函数:

why every time the offset address is different? if i want to transfer the data to a c function using c_types by::

ctypes_array = (ctypes.c_char * a.size * 8).from_address(ptr) 

我应该如何获得ptr的价值?

how should i get the value of ptr?

推荐答案

此外，请查看 ndarray.__array_interface__ ，这是一个字典，其中包含您要获取的所有信息.

Also, have a look at ndarray.__array_interface__, which is a dict that contains all of the information you're after.

就您而言，

pointer, read_only_flag = a.__array_interface__['data']

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