//这是在.h头文件中定义的
struct _TestStruct;
typedef struct _TestStruct TestStruct;

//这是在.cpp文件中定义的
typedef struct _TestStruct
{
    TestStruct1 struct1;
    TestStruct2 struct2;
}TestStruct;

__declspec(dllexport) TestStruct* __stdcall Init()
{
    return init();
}

__declspec(dllexport) BOOL __stdcall Update_Info(intptr_t* struct, char* key, char* value)
{
    return update_info((TestStruct*)struct, key, value);
}

//释放
__declspec(dllexport) void __stdcall Free_Struct(intptr_t struct)
{
    return free_struct((TestStruct*)struct);
}

        [DllImport("Test.dll")]
        public static extern IntPtr Init();

        [DllImport("Test.dll")]
        public static extern bool Update_Info(IntPtr struct, String key, String value);

        [DllImport("Test.dll")]
        public static extern void Free_Struct(IntPtr struct);