Mac Spotlight-API:如何搜索电子邮件的“收件人",“来自"或“主题"领域 [英] Mac Spotlight-API: how to search email's "to", "from" or "subject" fields
问题描述
目前,我有用于搜索电子邮件正文的Spotlight-api代码.我正在使用NSMetadataQuery
并为"kMDItemTextContent like[c] %@"
创建谓词.在电子邮件正文中请求搜索词"时,此方法可以正常工作.
At the moment I have spotlight-api code which searches email's body. I'm using NSMetadataQuery
and creating predicate for "kMDItemTextContent like[c] %@"
. This works fine when requested "search-term" is in body of email.
在Spotlight应用程序中(右上角的放大镜图标),如果我输入"to:john",我将获得电子邮件列表,其中"to"字段包含单词"john"(例如,某些电子邮件地址john @ something的一部分). com).
In Spotlight App (magnifier icon in top right) if I enter "to: john" I'll get list of emails in which "to" field contains word "john" (e.g. part of some email address john@something.com).
我尝试通过添加"kMDItemRecipients"
,"kMDItemRecipientEmailAddresses"
,"kMDItemAuthors"
,"kMDItemAuthorEmailAddresses"
和"kMDItemSubject"
类型的其他谓词来使用[NSCompoundPredicate orPredicateWithSubpredicates:]
实现此目的.
不幸的是,这不会返回所需的电子邮件.
I tried to achieve this with [NSCompoundPredicate orPredicateWithSubpredicates:]
by adding additional predicates of type "kMDItemRecipients"
, "kMDItemRecipientEmailAddresses"
, "kMDItemAuthors"
, "kMDItemAuthorEmailAddresses"
and "kMDItemSubject"
.
Unfortunately this doesn't return desired emails.
有人知道如何通过使用Spotlight-API来实现这一目标吗?
下面是我的代码:
NSString *predicateFormat = @"kMDItemTextContent like[c] %@";
NSPredicate *predicateToRun = [NSPredicate predicateWithFormat:predicateFormat, self.searchKey];
NSString *predicateFormat1 = @"kMDItemTitle like[c] %@";
NSPredicate *predicateToRun1 = [NSPredicate predicateWithFormat:predicateFormat1, self.searchKey];
NSString *predicateFormat2 = @"kMDItemAuthorEmailAddresses like[c] %@";
NSPredicate *predicateToRun2 = [NSPredicate predicateWithFormat:predicateFormat2, self.searchKey];
NSString *predicateFormat3 = @"kMDItemAuthors like[c] %@";
NSPredicate *predicateToRun3 = [NSPredicate predicateWithFormat:predicateFormat3, self.searchKey];
NSString *predicateFormat4 = @"kMDItemRecipientEmailAddresses like[c] %@";
NSPredicate *predicateToRun4 = [NSPredicate predicateWithFormat:predicateFormat4, self.searchKey];
NSString *predicateFormat5 = @"kMDItemRecipients like[c] %@";
NSPredicate *predicateToRun5 = [NSPredicate predicateWithFormat:predicateFormat5, self.searchKey];
NSString *predicateFormat6 = @"kMDItemSubject like[c] %@";
NSPredicate *predicateToRun6 = [NSPredicate predicateWithFormat:predicateFormat6, self.searchKey];
NSUInteger options = (NSCaseInsensitivePredicateOption|NSDiacriticInsensitivePredicateOption);
NSPredicate *compPred = [NSComparisonPredicate
predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"*"]
rightExpression:[NSExpression expressionForConstantValue:self.searchKey]
modifier:NSDirectPredicateModifier
type:NSLikePredicateOperatorType
options:options];
predicateToRun = [NSCompoundPredicate orPredicateWithSubpredicates:
[NSArray arrayWithObjects:
compPred,
predicateToRun, predicateToRun1, predicateToRun2, predicateToRun3, predicateToRun4,
predicateToRun5, predicateToRun6, nil]];
predicateToRun = [NSCompoundPredicate andPredicateWithSubpredicates:
[NSArray arrayWithObjects:predicateToRun, [NSPredicate predicateWithFormat:@"(kMDItemContentType != 'public.vcard')"], nil]];
[self.query setPredicate:predicateToRun];
[self.query startQuery];
推荐答案
我知道如何使用MDQuery做到这一点-我认为这更简单.
I know how to do this with MDQuery - which in my opinion is simpler.
您可以使用与从命令行在mdfind中使用的查询基本相同的查询.
You can use basically the same queries as you can use in mdfind from the command line.
输入类似以下内容的搜索字符串:(未测试)
make a search string like: (NOT tested)
((((kMDItemAuthorEmailAddresses == "*john*"cd)) || ((kMDItemAuthors == "*john*"cd))) && (kMDItemContentType == 'com.apple.mail.emlx'))
也在终端中 mdls/path/to/library/mail/v2/24324.emlx 将显示搜索电子邮件的内容.它是你的朋友
also in terminal mdls /path/to/library/mail/v2/24324.emlx will show what to search on for emails. Its your friend
请注意如何连接目标c通知.
Note how you can hook up objective c notifications.
NSString* query = some string ;
MDQueryRef mdQuery = MDQueryCreate(nil, (CFStringRef)query, nil, nil);
// if something is goofy, we won't get the query back, and all calls involving a mil MDQuery crash. So return:
if (mdQuery == nil)
return;
NSNotificationCenter* nf = [NSNotificationCenter defaultCenter];
[nf addObserver:self selector:@selector(progressUpradeQuery:) name:(NSString*)kMDQueryProgressNotification object:(id) mdQuery];
[nf addObserver:self selector:@selector(finishedUpradeQuery:) name:(NSString*)kMDQueryDidFinishNotification object:(id) mdQuery];
[nf addObserver:self selector:@selector(updatedUpradeQuery:) name:(NSString*)kMDQueryDidUpdateNotification object:(id) mdQuery];
// Should I run this query on the network too? Difficult decision, as I think that this will slow stuff way down.
// But i think it will only query leopard servers so perhaps ok
//MDQuerySetSearchScope(mdQuery, (CFArrayRef)[NSArray arrayWithObjects:(NSString*)kMDQueryScopeComputer, (NSString*)kMDQueryScopeNetwork, nil], 0);
// start it
BOOL queryRunning = MDQueryExecute(mdQuery, kMDQueryWantsUpdates);
if (!queryRunning)
{
CFRelease(mdQuery);
mdQuery = nil;
// leave this log message in...
NSLog(@"MDQuery failed to start.");
return;
}
汤姆
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