WeiboSDK 3.0.1

下面是我尝试的代码

WBMusicObject *musicObj = [WBMusicObject object];
musicObj.objectID = @"string value";
musicObj.title = @"title";
musicObj.description = @"desc";
musicObj.thumbnailData = UIImageJPEGRepresentation(cover, 0.2);
musicObj.musicUrl = webLink;
musicObj.musicStreamUrl = audioUrl;

WBMessageObject *msg = [WBMessageObject message];
msg.mediaObject = musicObj;

WBSendMessageToWeiboRequest *request = [WBSendMessageToWeiboRequest requestWithMessage:msg];
[WeiboSDK sendRequest:request];

我这么写的，分享出来的却仅仅是一个链接，谁能告诉我应该怎么做呢？