当运行我的程序来查询我的 iPhone 的 iPod 库时，我在控制台中得到以下输出：
CPSqliteStatementPerform：尝试为 UPDATE ddd.ext_container SET orig_date_modified = (SELECT date_modified FROM container WHERE pid=container_pid) WHERE orig_date_modified=0 写入只读数据库
我已经禁用了输出到控制台的所有内容，所以好像我的 NSLog 没有错误。这里发生了什么，我该如何解决。我将包括我正在调用的整个类源代码，以及完成工作的类（很抱歉将其全部发布：
+(NSMutableDictionary *) makeQuery {
MPMediaQuery *query = [[MPMediaQuery alloc] init]; //query iPod library
NSString *facebookIDKey = @"Facebook ID";
NSString *genericFacebookID = @"1234567890";
NSMutableDictionary *organizedSongData = [NSMutableDictionary dictionaryWithObject:genericFacebookID forKey:facebookIDKey];
NSArray *allSongs = [query collections];
//only add those songs which have not
//been played since last login
for (MPMediaItem *recent in allSongs) {
NSDate *lastPlayed = [recent valueForProperty:MPMediaItemPropertyLastPlayedDate];
int songCounter = 1;
BOOL uploadInfo = [[PlayedSinceLastLogin alloc] initWithLastPlayedDateOfSong:lastPlayed];
if (uploadInfo == YES) {
//adds songs into
[organizedSongData addEntriesFromDictionary: [MakeDicForSongInfo initWithMPMediaItem:recent andSongNumber:songCounter]];
songCounter++;
}
}
return organizedSongData;
}
这是在 MakeDicForSongInfo 中完成的实际首当其冲的工作：
+(NSDictionary *) initWithMPMediaItem:(MPMediaItem *) song andSongNumber: (int)songCount{
//Create & initialize NSStrings for keys
//Create NSArray to hold keys
NSString *songKey = [NSString stringWithFormat: @"%i Song Title", songCount];
NSString *albumKey = [NSString stringWithFormat: @"%i Album", songCount];
NSString *artistKey = [NSString stringWithFormat: @"%i Artist", songCount];
NSString *artistIDKey = [NSString stringWithFormat: @"%i Artist Persistent ID", songCount];
NSString *lastPlayedKey = [NSString stringWithFormat: @"%i Late Played Date", songCount];
NSString *genreKey = [NSString stringWithFormat: @"%i Genre", songCount];
NSString *ratingKey = [NSString stringWithFormat: @"%i User Rating", songCount];
NSString *playCountKey = [NSString stringWithFormat: @"%i Play Count", songCount];
NSArray *propertyKeys = [[NSArray alloc] initWithObjects:songKey, albumKey, artistKey, artistIDKey,
lastPlayedKey, genreKey, ratingKey, playCountKey, nil];
//Create & initialize NSStrings to hold song property information
//Create NSArray to hold the values
NSString *songTitle = [song valueForProperty:MPMediaItemPropertyTitle];
NSString *albumName = [song valueForProperty:MPMediaItemPropertyAlbumTitle];
NSString *artistName = [song valueForProperty:MPMediaItemPropertyArtist];
NSString *artistID = [song valueForProperty:MPMediaItemPropertyArtistPersistentID];
NSString *lastPlayed = [song valueForProperty:MPMediaItemPropertyLastPlayedDate];
NSString *genre = [song valueForProperty:MPMediaItemPropertyGenre];
NSString *userRating = [song valueForProperty:MPMediaItemPropertyRating];
NSString *playCount = [song valueForProperty:MPMediaItemPropertyPlayCount];
NSArray *propertyValues = [[NSArray alloc] initWithObjects:songTitle, albumName, artistName, artistID,
lastPlayed, genre, userRating, playCount, nil];
//Create NSDictionary to store information, initializing it with
//above data, then returning the resulting dictionary
NSDictionary *songInfo = [[NSDictionary alloc] initWithObjects:propertyValues forKeys:propertyKeys];
return songInfo;
}
访问所有吓坏 iPhone 的媒体信息会不会是某种东西？