Copy structure to string

error

    memcpy(wrmsg.buf,msg,sizeof(char_msg_t));语法错误

 

Correct (all three ways of writing are fine)

  //结构体拷到数组
      memcpy(wrmsg.buf,(char*)&msg,sizeof(char_msg_t));强转与不强转是一致的

     memcpy(&wrmsg.buf,&msg,sizeof(char_msg_t));  

    memcpy(wrmsg.buf,&msg,sizeof(char_msg_t));

 

 

After the structure is copied to the array, the printed array may be empty or garbled. Don't panic at this time, you can convert the array to a structure for verification

//数组拷到字符串
     char_msg_t getmsg;
     memcpy(&getmsg,wrmsg.buf,sizeof(char_msg_t));