编程中看到了下面三句,不明白前面的1是什么意思,而且输出结果是引号中的内容吗? TRACE(1, "\tfailureCause\n");TRACE(1, "\t\tselectOriginator = %d\n", msg->selectOriginator);TRACE(1, "\t\t%s\n", causeName[msg->selectOriginator-1]);哪位大牛可以给讲一下TRACE的用法,最好是带个例子之类的,形象一些的~~