我正在尝试在 iPhone 上获取 picasa 网络相册,已从 google.code 下载了代码和示例,但遇到了一个问题:获取相册提要返回的提要包含错误的对象类型 - GDataEntryBase 而不是 GDataEntryPhoto。
这是我正在使用的代码:
首先,我调用它来获取我的所有专辑:
- (void)fetchAllAlbums
{
NSLog(@"Fetching all albums");
//request albums
GDataServiceTicket *ticket;
NSURL *feedURL = [GDataServiceGooglePhotos photoFeedURLForUserID:myemail
albumID:nil
albumName:nil
photoID:nil
kind:nil
access:nil];
ticket = [_GooglePhotoService fetchFeedWithURL:feedURL
delegate:self
didFinishSelector:@selector(albumListFetchTicket:finishedWithFeed:error:)];
[self set_AlbumFetchTicket: ticket];
}
现在,在回调中我调用以获取每个返回相册的所有照片:
- (void)albumListFetchTicket:(GDataServiceTicket *)ticket
finishedWithFeed:(GDataFeedPhotoUser *)feed
error:(NSError *)error
{
[self set_UserAlbumFeed: feed];
[self set_AlbumFetchError:error];
[self set_AlbumFetchTicket:nil];
if (error == nil) {
NSLog(@"Got albums!");
for (GDataEntryPhotoAlbum * albumEntry in _UserAlbumFeed)
{
NSLog(@"Album Title: %@", [[albumEntry title] stringValue]);
{
NSLog(@"Fetching photos!");
[self set_AlbumPhotosFeed:nil];
[self set_PhotosFetchError:nil];
[self set_PhotosFetchTicket:nil];
GDataServiceTicket *ticket;
ticket = [_GooglePhotoService fetchFeedWithURL: [[albumEntry feedLink] URL]
delegate: self
didFinishSelector: @selector(photosTicket:finishedWithFeed:error:)];
[self set_PhotosFetchTicket:ticket];
}
}
}
}
这是每个相册照片提要获取的回调:
// photo list fetch callback
- (void)photosTicket:(GDataServiceTicket *)ticket
finishedWithFeed:(GDataFeedPhotoAlbum *)feed
error:(NSError *)error
{
//tell me what class you are
NSLog(@"Feed class: %@", NSStringFromClass([feed class]));
[self set_AlbumPhotosFeed: feed];
[self set_PhotosFetchError: error];
[self set_PhotosFetchTicket: ticket];
if (error == nil)
{
NSLog(@"Got Photos!");
for (GDataEntryPhoto * photo in feed)
{
NSLog(@"Title: %@", [[photo title] stringValue]);
//tell me what class you are
NSLog(@"%@", NSStringFromClass([photo class]));
//NSArray * thumbnails = [[photo mediaGroup] mediaThumbnails];
//NSLog(@"thumbnails count: %d", [thumbnails count]);
//NSLog(@"Photo thumnail url: %@", [[thumbnails objectAtIndex:0] URLString]);
}
}
}
问题在于,最后一个回调中提要中的条目不是 GDataEntryPhoto 类型,而只是基本 GDataEntryBase - 因此尝试访问它们的缩略图 URL 将使应用程序崩溃。 该代码是从 google 的 cocoa(非触摸)示例复制而来的,并且它可以正常工作 - 返回的提要由 GDateEntryPhoto 对象填充。
如有任何帮助,我们将不胜感激。
最佳答案
将 -ObjC -all_load
添加到 xcode 项目中的其他链接器标志,然后添加 SystemConfiguration.framework
、CFNetwork.framework
和 Security.framework
到构建阶段 -> 使用二进制文件链接库。
关于iphone - 获取 GDataFeedPhotoAlbum 返回错误的对象类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9442583/