1 //hello.h
 2 #ifdef EXPORT_HELLO_DLL
 3 #define HELLO_API __declspec(dllexport)
 4 #else
 5 #define HELLO_API __declspec(dllimport)
 6 #endif
 7 extern "C"
 8 {
 9  HELLO_API int IntAdd(int , int);
10 }
11
12 //hello.cpp
13 #define EXPORT_HELLO_DLL
14 #include "hello.h"
15 HELLO_API int IntAdd(int a, int b)
16 {
17  return a + b;
18 }

1 from ctypes import *
2 dll = cdll.LoadLibrary('hello.dll')
3 ret = dll.IntAdd(2, 4)
4 print（ret）

 1 //hello.h
 2 #ifdef EXPORT_HELLO_DLL
 3 #define HELLO_API __declspec(dllexport)
 4 #else
 5 #define HELLO_API __declspec(dllimport)
 6 #endif
 7
 8 #define ARRAY_NUMBER 20
 9 #define STR_LEN 20
10
11 struct StructTest
12 {
13  int number;
14  char* pChar;
15  char str[STR_LEN];
16  int iArray[ARRAY_NUMBER];
17 };
18
19 extern "C"
20 {
21  //HELLO_API int IntAdd(int , int);
22  HELLO_API char* GetStructInfo(struct StructTest* pStruct);
23 }
24
25 //hello.cpp
26 #include <string.h>
27 #define EXPORT_HELLO_DLL
28 #include "hello.h"
29
30 HELLO_API char* GetStructInfo(struct StructTest* pStruct)
31 {
32  for (int i = 0; i < ARRAY_NUMBER; i++)
33  pStruct->iArray[i] = i;
34  pStruct->pChar = "hello python!";
35  strcpy (pStruct->str, "hello world!");
36  pStruct->number = 100;
37  return "just OK";
38 }

from ctypes import *
ARRAY_NUMBER = 20;
STR_LEN = 20;
#define type
INTARRAY20 = c_int * ARRAY_NUMBER;
CHARARRAY20 = c_char * STR_LEN;
#define struct
class StructTest(Structure):_fields_ = [("number", c_int),("pChar", c_char_p),("str", CHARARRAY20),("iArray", INTARRAY20)]
#load dll and get the function object
dll = cdll.LoadLibrary('hello.dll');
GetStructInfo = dll.GetStructInfo;
#set the return type
GetStructInfo.restype = c_char_p;
#set the argtypes
GetStructInfo.argtypes = [POINTER(StructTest)];
objectStruct = StructTest();
#invoke api GetStructInfo
retStr = GetStructInfo(byref(objectStruct));
#check result
print "number: ", objectStruct.number;
print "pChar: ", objectStruct.pChar;
print "str: ", objectStruct.str;
for i,val in enumerate(objectStruct.iArray):print 'Array[i]: ', val;
print retStr;