Python 调用 C++ 动态库 几种常用使用方法

最近使用Python调用c++动态库，下面简单介绍下几种常用方法

代码

1. 参数是基本类型

   1. extern "C" DLL_TEST_API int add(int a , int b);
      

   2. def add():
          add = dll.add
          add.argtypes = [c_int, c_int]
          add.restype = c_int
          res = add(c_int(1), c_int(2))
          print(res)
      

2. 参数是字符串

   1. extern "C" DLL_TEST_API int show(const char* msg);
      

   2. def show():
          show = dll.show
          show.argtypes = [POINTER(c_char)]
          show.restype = c_int
          msg = bytes("hello world", "gbk")
          res = show(msg)
      

3. 参数是结构体

   1. struct Info
      {
      	char* name;
      	int age;
      };
      
      extern "C" DLL_TEST_API int show_info(Info* msg);
      

   2. class Info(Structure):
          _fields_ = [
              ("name", c_char_p),
              ("age", c_int)
          ]
          
      def show_info():
          show_info = dll.show_info
          show_info.argtypes = [POINTER(Info)]
          show_info.restype = c_int
          info = Info()
          info.name = bytes("wang san", "gbk")
          info.age = 20
          res = show_info(byref(info))
      

4. 返回结构体

   1. extern "C" DLL_TEST_API Info* get_info(char* name , int age);
      

   2. def get_info():
          get_info = dll.get_info
          get_info.argtypes = [POINTER(c_char), c_int]
          get_info.restype = POINTER(Info)
          name = b"zhang san"
          res = get_info(name, c_int(10))
          print("name:{0} age:{1}".format(res.contents.name.decode(), res.contents.age))
      

5. DLL 路径一定要写绝对路径，不要写相对路径。

6. Demo: https://download.csdn.net/download/haiyangyunbao813/16622511

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