使用python调用Dll，而dll返回字符串*（或char **）

Question

我想使用python调用C ++，所以我构建了一个新的Dll项目。我可以成功加载DLL！我想在python中打印string[]。但现在我可以打印int，char*（如下图所示，它是：＆＃34;我爱myPan！＆＃34;）。 那么，我该如何打印其他参数呢？

hello.h

    extern "C"
    {   HELLO_API int IntAdd(int, int);
        HELLO_API char* show();
        HELLO_API char** call_char();
        HELLO_API string* call_pic(char* pic);
    }

HELLO.CPP

        HELLO_API int IntAdd(int a, int b)
        {   return a + b;
        }
        HELLO_API char* show()
        {
            return "I love U";
        }
        HELLO_API string* call_pic(char* pic)
        {   
            string a[] = {"show example","search picture","I write python " };//just to show an example
            return a;
        } //stack overflow tell me must add comment
        HELLO_API char** call_char()
        {
           char* a[] = { "I love myPan", "Love is wonderful ", "You are only love" };
           return a;
        }

下面是我的python代码：

        import ctypes  
        from ctypes import *  
        func = cdll.LoadLibrary('Hello.dll')
        ret = func.IntAdd(6,4)
        print(ret) //print  10
        str0 = func.show()
        size = -1
        str0 = ctypes.string_at(str0,size)
        print(str0)  //print  b"I love U"
        str1 = func.call_pic('22.jpg')
        str1=ctypes.string_at(str1,size)
        print(str1)  //Cann't Work!
        print(str1.decode('utf-8'))  // Cann't Work!
        str2 = func.call_char()
        print(str2.value)     //Cann't Work!
        str3 =ctypes.string_at(str2[0],size)
        print(str2.decode('utf-8'))  // Cann't Work!