switch 语句：error : crosses initialization of 'xxx' and jump to case label [-fpermissive]

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1.错误

		case Hearting:
			baseDG heartReply;
			heartReply.set_cmd(HeartReply);
			heartReply.set_tagid(mesg->tagid());
			int len;
			len = heartReply.ByteSize();
			char *p = (char*)malloc(len);//报错：crosses initialization of 'xxx'
			heartReply.SerializePartialToArray(p,len);
			SendDataSocket(p,len);
			free(p);
			break;
		case HeartReply://报错：jump to case label [-fpermissive]
			break;
		case OnModeChanged:
			break;
		case ModeException:
			break;
		case AudioStream:

2.修改后：

		case Hearting:{
				baseDG heartReply;
				heartReply.set_cmd(HeartReply);
				heartReply.set_tagid(mesg->tagid());
				int len;
				len = heartReply.ByteSize();
				char *p;//先声明，后定义
				p = (char*)malloc(len);
				heartReply.SerializePartialToArray(p,len);
				SendDataSocket(p,len);
				free(p);
			}//记住大括号
			break;
		case HeartReply:
			break;
		case OnModeChanged:
			break;
		case ModeException:
			break;
		case AudioStream: