老谭笔记

Cocoa中多种方式获取用户的Email信息

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我们在开发一款软件的时候，经常会遇到需要用户填入自己的邮件，如果都让用户来输入则必然降低了用户的体验，如果用户在系统中已经预设了自己的Email，则让软件自动填入这个邮箱，虽然只是一个小的细节，是不是就带来了更好的体验呢？当然恶意软件就除外了哈！

下面就通过几种不同的方法来获取不同位置的默认邮箱地址：

方法1，获取系统用户预设的email信息(这个一般用户的邮箱都是为空的，推荐指数1颗星)：

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- (NSString *)emailFromCS
{
	/* Create a new identity query with the name passed in, most likely taken from the search field */
	CSIdentityQueryRef _identityQuery = CSIdentityQueryCreateForName(NULL, (__bridge CFStringRef)@"", kCSIdentityQueryStringBeginsWith, kCSIdentityClassUser, CSGetLocalIdentityAuthority());
    CSIdentityQueryExecute(_identityQuery, kCSIdentityQueryGenerateUpdateEvents, NULL);
    NSArray *identities = (__bridge NSArray *)CSIdentityQueryCopyResults(_identityQuery);
    NSMutableDictionary *emailDic = [NSMutableDictionary dictionary];
    for (id identity in identities)
    {
        NSString *posixName = (__bridge NSString *)CSIdentityGetPosixName((__bridge CSIdentityRef)(identity));
        NSString *emailAddress = (__bridge NSString *)CSIdentityGetEmailAddress((__bridge CSIdentityRef)(identity));
        if ([posixName length] > 0 && [emailAddress length] > 0)
        {
            [emailDic setObject:emailAddress forKey:posixName];
        }
    }
    if ([emailDic count] == 0)
    {
        return nil;
    }
    NSString *userEmail = [emailDic objectForKey:NSUserName()];
    if (userEmail)
    {
        return userEmail;
    }
    return [[emailDic allValues] objectAtIndex:0];
}

方法2，通过读取用户的通讯本，来获取（10.8之后程序访问通讯录，会弹出用户确认窗口，所以推荐指数2颗星）:

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- (NSString *)emailFromAB
{
    ABPerson* meCard = [[ABAddressBook sharedAddressBook] me];
    if( meCard == nil )
    {
        return nil;
    }
    // Get my email addresses.
    ABMultiValue* anEmailList = [meCard valueForProperty:kABEmailProperty];
    if( anEmailList == nil )
    {
        return nil;
    }
    // Output them.
    for( NSUInteger index = 0; index < [anEmailList count]; index++ )
    {
        NSString* aValue = [anEmailList valueAtIndex:index];
        if ([aValue length] > 0)
        {
            return aValue;
        }
    }
    return nil;
}

方法3(通过访问Mail中用户的帐户信息，推荐指数3颗星，流氓指数3颗星)：

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- (NSString *)emailFromMail
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    if ([paths count] == 0)
    {
        return nil;
    }
    NSString *libraryPath = [paths objectAtIndex:0];
    NSString *mailPath = [libraryPath stringByAppendingPathComponent:@"Mail/V2/MailData/Accounts.plist"];
    if (![[NSFileManager defaultManager] fileExistsAtPath:mailPath])
    {
        //Mail 5.0以前
        mailPath = [libraryPath stringByAppendingPathComponent:@"Preferences/com.apple.mail.plist"];
        if (![[NSFileManager defaultManager] fileExistsAtPath:mailPath])
        {
            return nil;
        }
    }
    NSDictionary *acountDic = [NSDictionary dictionaryWithContentsOfFile:mailPath];
    NSArray *mailAccounts = [acountDic objectForKey:@"MailAccounts"];
    for (NSDictionary *aAcountDic in mailAccounts)
    {
        if ([aAcountDic isKindOfClass:[NSDictionary class]])
        {
            NSArray *emailAddresses = [aAcountDic objectForKey:@"EmailAddresses"];
            for (NSString *aEmailAddress in emailAddresses)
            {
                if ([aEmailAddress isKindOfClass:[NSString class]] && [aEmailAddress length] > 0)
                {
                    NSString *emailRegex = @"^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)$";
                    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",emailRegex];
                    BOOL isEmail = [emailTest evaluateWithObject:aEmailAddress];
                    if (isEmail)
                    {
                        return aEmailAddress;
                    }
                }
            }
        }
    }
    return nil;
}