python调用C

 

1. 文件目录为

./
add.c
python-c.py

2. 进入文件目录编译成dll库

cygwin下执行：gcc -shared -Wl,-soname,adder -o adder.dll -fPIC add.c

3. 运行python代码

import ctypes
 
#load the shared object file
adder = ctypes.cdll.LoadLibrary('adder.dll')
 
#Find sum of integers
res_int = adder.add_int(4,5)
print("4 + 5 = " + str(res_int))
 
#Find sum of floats
a = ctypes.c_float(5.5)
b = ctypes.c_float(4.1)

add_float = adder.add_float
add_float.restype = ctypes.c_float
 
print("5.5 + 4.1 = " + str(add_float(a, b)))

4. 注意运行int和float不同的处理方式

adder.add_int(4,5)
add_float(a, b)