model

type Error struct {
	ErrorCode int    `json:"errcode"`
	ErrorMsg  string `json:"errmsg"`
}

type Message struct {
	XMLName struct{} `xml:"xml""`

	MsgId        int
	ToUserName   string
	FromUserName string
	CreateTime   int64
	MsgType      string

	// text
	Content string

	// image
	PicUrl string
}