9. Python與C之導入變量

1. 經過對應類型的類方法in_dll的方式來加載。

   struct Test
   	{
   		int a;
   		int b;
   		Test(int x=5,int y = 6):a(x),b(y){}
   	};
   	extern "C" int hello = 1;
   	extern "C" int * hellop = &hello;
   	extern "C" Test t(1,2);
   	extern "C" void show()
   	{
   		hello = 10;
   	}

   from ctypes import *
   	class Test(Structure):
   		_fields_ = [ ("a",c_int),("b",c_int)]
   	handle = CDLL("./test.so")
   	hello  = c_int.in_dll(handle,"hello")
   	hellop = POINTER(c_int).in_dll(handle,"hellop")
   	ttest  = Test.in_dll(handle,"t")
   	handle.show()
   	print(hello,hellop[0],ttest.a,ttest.b)

2. 編譯執行

   g++ -m32 -shared -fPIC -o test.so test.cpp

   python test.py