百度公開有一個音樂接口，里面分好了頻道類別。下面是3個接口的一個url地址。
const QString url_getOnlineChannel = "http://fm.baidu.com/dev/api/?tn=channellist"; //url->頻道ID
const QString url_getOnlineSheet = "http://fm.baidu.com/dev/api/?tn=playlist&format=json&id="; //頻道ID->歌曲ID
const QString url_getOnlineMusic = "http://music.baidu.com/data/music/fmlink?type=mp3&rate=320&songIds="; //歌曲ID->歌曲信息
訪問每個url都會返回一個JSON的信息，通過解析JSON來獲取其中的信息。
流程就如url地址一樣，分為3步：
- 獲取頻道列表。
無條件訪問 http://fm.baidu.com/dev/api/?tn=channellist 。
這里可以獲取到所有的頻道信息，如下：
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- 獲取歌曲列表。
通過上述獲取到的 channel_id 信息加在 http://fm.baidu.com/dev/api/?tn=playlist&format=json&id= 后，便可以得到該頻道的音樂信息。
如訪問：http://fm.baidu.com/dev/api/?tn=playlist&format=json&id=public_yuzhong_yueyu ，獲取如下JSON
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同樣，根據上述JSON獲得 id 信息加上 http://music.baidu.com/data/music/fmlink?type=mp3&rate=320&songIds= 便可以獲得某一首歌的具體信息。
如訪問：http://music.baidu.com/data/music/fmlink?type=mp3&rate=320&songIds=913503 ，獲得如下的json：
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其中：songLink便是歌曲真實的在線可播放地址，還有其他許多的信息可以直接通過JSON上的Name信息看懂，就不一一贅述了。
