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使用ctypes调用C共享库中函数返回值为链表式结构时的方法
/*********************************************************************
* Author : Samson
* Date : 02/02/2015
* Test platform:
* 3.13.0-24-generic
* GNU bash, 4.3.11(1)-release
* *******************************************************************/C共享库中存在这样的函数：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define true 1
#define false 0
typedef struct user_server_list{
char servername[64];
char server_status; /* on: true off:flase*/
char server_manual_start; /* enable: true disable: false*/
struct user_server_list *next;
}Struct_server_list, *P_Struct_server_list;
int add(int a, int b)
{
int c = a + b;
return c;
}
P_Struct_server_list get_server_list()
{
P_Struct_server_list p = malloc(sizeof(Struct_server_list));
memset(p, 0, sizeof(Struct_server_list));
strcpy(p->servername, "ssh");
p->server_status = true;
p->server_manual_start = false;
P_Struct_server_list p2 = malloc(sizeof(Struct_server_list));
memset(p2, 0, sizeof(Struct_server_list));
strcpy(p2->servername, "cmd");
p2->server_status = true;
p2->server_manual_start = false;
p->next = p2;
p2->next = NULL;
return p;
}
#include <stdlib.h>
#include <string.h>
#define true 1
#define false 0
typedef struct user_server_list{
char servername[64];
char server_status; /* on: true off:flase*/
char server_manual_start; /* enable: true disable: false*/
struct user_server_list *next;
}Struct_server_list, *P_Struct_server_list;
int add(int a, int b)
{
int c = a + b;
return c;
}
P_Struct_server_list get_server_list()
{
P_Struct_server_list p = malloc(sizeof(Struct_server_list));
memset(p, 0, sizeof(Struct_server_list));
strcpy(p->servername, "ssh");
p->server_status = true;
p->server_manual_start = false;
P_Struct_server_list p2 = malloc(sizeof(Struct_server_list));
memset(p2, 0, sizeof(Struct_server_list));
strcpy(p2->servername, "cmd");
p2->server_status = true;
p2->server_manual_start = false;
p->next = p2;
p2->next = NULL;
return p;
}
使用gcc -g -fPIC -shared -o libhelloworld.so.0.0.0 test.c编译成动态库；
然后编写python调用程序，代码如下：
#!/bin/env python
# coding=UTF-8
from ctypes import *
class StructPointer(Structure):
pass
StructPointer._fields_=[("servername", c_char * 64), ("server_status", c_char), ("server_manual_start", c_char), ("next", POINTER(StructPointer))]
lib = cdll.LoadLibrary(‘./libhelloworld.so.0.0.0‘)
lib.get_server_list.restype = POINTER(StructPointer)
p = lib.get_server_list()
print p.contents.servername
p2=p.contents.next[0]
print p2.servername
# coding=UTF-8
from ctypes import *
class StructPointer(Structure):
pass
StructPointer._fields_=[("servername", c_char * 64), ("server_status", c_char), ("server_manual_start", c_char), ("next", POINTER(StructPointer))]
lib = cdll.LoadLibrary(‘./libhelloworld.so.0.0.0‘)
lib.get_server_list.restype = POINTER(StructPointer)
p = lib.get_server_list()
print p.contents.servername
p2=p.contents.next[0]
print p2.servername
执行结果为：
ufo@ufo:~$ python testpython.py ssh
cmd
使用ctypes调用C共享库中函数返回值为链表式结构时的方法
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