Linux环境下使用python调用C的printf例子：
#!/usr/bin/env python2.7
#-*- coding:utf-8 -*-
from ctypes import *
def test():
#libc = cdll.LoadLibrary("libc.so.6")
libc = CDLL("libc.so.6")
msg = "hello world!\n"
libc.printf("Testing:%s",msg)
def main():
test() if __name__ == '__main__':
main()
python中结构体对应的类型：
#!/usr/bin/env python2.7
#-*- coding:utf-8 -*-
from ctypes import *
class barley_amout(Structure):
_fields_ = [
("barley_long",c_long),
("barley_int",c_int),
("barley_char",c_char*100)
]
def main():
bu = barley_amout(66,44,"Hello world")
print bu.barley_long
print bu.barley_int
print bu.barley_char if __name__ == '__main__':
main()
python中Union体对应的类型：
class _U(Union):
_fields_ = [("lptdesc", POINTER(TYPEDESC)),
("lpadesc", POINTER(ARRAYDESC)),
("hreftype", HREFTYPE)] class TYPEDESC(Structure):
_anonymous_ = ("u",)
_fields_ = [("u", _U),
("vt", VARTYPE)]
调用方式
td = TYPEDESC()
td.vt = VT_PTR
td.lptdesc = POINTER(some_type)
td.u.lptdesc = POINTER(some_type)
生成单个so动态库并通过python调用
1、test.c文件
#include <stdio.h>
void print_helloworld(){
printf("%s","Hello world!\n");
}
int main(){
print_helloworld();
return ;
}
2、生成动态库文件
gcc -fPIC -c test.c -o libtest.o
通过这种方式在python调用的时候出现
OSError: ./libtest.o: only ET_DYN and ET_EXEC can be loaded
参照这个博客http://xieruilin.iteye.com/blog/730422
修改方式如下：
gcc -fpic -shared -o libtest.o ./test.c
3、python调用
[root@typhoeus79 20140509]# more call_test.py
#!/usr/bin/env python2.7
#-*- coding:utf-8 -*- from ctypes import *
def test():
libc = CDLL("./libtest.o")
libc.print_helloworld() if __name__ == '__main__':
test()
[root@typhoeus79 20140509]# ./call_test.py
Hello world!
参考文献
https://docs.python.org/2/library/ctypes.html?highlight=structure#ctypes.Structure
https://docs.python.org/2.7/library/ctypes.html#module-ctypes
http://chimera.labs.oreilly.com/books/1230000000393/ch15.html#_solution_240
http://wangrqa.blog.163.com/blog/static/170946827201010309510247/