[英]How to use float ** in Python with Swig?
I am writing swig bindings for some c functions. 我正在为某些C函数编写Swig绑定。 One of these functions takes a float**. 这些功能之一采用浮点数**。 I am already using cpointer.i for the normal pointers and looked into carrays.i , but I did not find a way to declare a float**. 我已经使用cpointer.i作为普通指针并查看了carrays.i ,但是我没有找到声明float **的方法。 What do you recommend? 您有什么推荐的吗?
interface file: 接口文件:
extern int read_data(const char *file,int *n_,int *m_,float **data_,int **classes_); extern int read_data(const char * file,int * n_,int * m_,float ** data_,int ** classes_);
This answer is a repost of one to a related question Framester posted about using ctypes instead of swig. 这个答案是对Framester发布的有关使用ctypes而不是swig的一个相关问题的转发。 I've included it here in case any web-searches turn up a link to his original question. 我将其包括在此处,以防任何网络搜索出现指向他原始问题的链接。
I've used ctypes for several projects now and have been quite happy with the results. 我现在已经将ctypes用于多个项目,并且对结果非常满意。 I don't think I've personally needed a pointer-to-pointer wrapper yet but, in theory, you should be able to do the following: 我认为我个人还不需要指针对指针包装器,但是从理论上讲,您应该能够执行以下操作:
from ctypes import *
your_dll = cdll.LoadLibrary("your_dll.dll")
PFloat = POINTER(c_float)
PInt = POINTER(c_int)
p_data = PFloat()
p_classes = PInt()
buff = create_string_buffer(1024)
n1 = c_int( 0 )
n2 = c_int( 0 )
ret = your_dll.read_data( buff, byref(n1), byref(n2), byref(p_data), byref(p_classes) )
print('Data: ', p_data.contents)
print('Classes: ', p_classes.contents)
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