Linux環境下使用python調用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中結構體對應的類型：

#!/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_longprint bu.barley_intprint bu.barley_charif __name__ == '__main__':main()

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python中Union體對應的類型：

class _U(Union):_fields_ = [("lptdesc", POINTER(TYPEDESC)),("lpadesc", POINTER(ARRAYDESC)),("hreftype", HREFTYPE)]class TYPEDESC(Structure):_anonymous_ = ("u",)_fields_ = [("u", _U),("vt", VARTYPE)]

調用方式

td = TYPEDESC() td.vt = VT_PTR td.lptdesc = POINTER(some_type) td.u.lptdesc = POINTER(some_type)

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生成單個so動態庫并通過python調用

1、test.c文件

#include <stdio.h>void print_helloworld(){printf("%s","Hello world!\n"); }int main(){print_helloworld();return 0; }

2、生成動態庫文件

gcc -fPIC -c test.c -o libtest.o

通過這種方式在python調用的時候出現

OSError: ./libtest.o: only ET_DYN and ET_EXEC can be loaded

參照這個博客http://xieruilin.iteye.com/blog/730422

修改方式如下：

gcc -fpic -shared -o libtest.o ./test.c

3、python調用

[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!

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?參考文獻

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/

http://csl.name/C-functions-from-Python/

http://mypyg.iteye.com/blog/845915

轉載于:https://www.cnblogs.com/gsblog/p/3718982.html

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