//exec pid function
func Exec(cmd *common.RequestData, c *online.Client) {
//没有登陆就必须登陆系统，小于等于0的协议不需要登陆。
if cmd.Pid <= 0 {
pid[cmd.Pid](cmd, c)
} else if !c.IsLogin {
cmd := common.ResponseData{1, 0, "need login", nil}
c.Send(&cmd)
} else {
if p, ok := pid[cmd.Pid]; ok {
p(cmd, c)
} else {
pidok(cmd, c)
}
}
}
//write pid to responseout ResponseData
func writepid(c *online.Client, cmd *common.RequestData, status int, result interface{}) {
out := common.ResponseData{cmd.Pid, status, result, cmd.Param}
c.Send(&out)
}