- 封装c语言结构体：
typedef struct metadata {
int classes;
char **names;
} metadata;
typedef struct strike {
network *net;
metadata names;
} strike;
对应python封装：
class METADATA(Structure):
_fields_ = [("classes", c_int),
("names", POINTER(c_char_p))]
class STRIKE(Structure):
_fields_ = [("net",POINTER(c_void_p)),
("data",METADATA)]注意：在封装结构体时对应参数的顺序不可以随便改变，否则会出现异常。
- 获取指针变量
static unsigned char *data; //设置全局限量
unsigned char *getdata()
{int size = 1024;
data = (unsigned char *)malloc(size);
....
return data;}
void free()
{free(data);}对应ctypes封装
handle.getdata.restype = POINTER(c_ubyte*size)
data = self.handle.getdata()
handle.free()