Is anyone familiar with NSStringrangeOfCharacterFromSet:options
Is anyone familiar with NSStringrangeOfCharacterFromSet:options
- Subject: Is anyone familiar with NSStringrangeOfCharacterFromSet:options
- From: David Yamartino <email@hidden>
- Date: Thu, 22 Jan 2009 12:41:53 +1000
Hi All,
I need to write an application where the user inputs a search term and the app looks in a folder and subfolders containing text files and then displays not just the location of the documents containing the search string, but the context of each instance (maybe a few sentences before and after - or maybe just sends you to that part of the document where you can read before and after).
The "Search Kit Programming Guide" gives a "complete search method" under Listing 3-19 (see below), but it also states that it only finds documents, not the "position of a term within a document":
To Search Kit, a document is atomic in that it defines the granularity of a search. Using Search Kit, your application can find documents—as your application understands them—but cannot locate the position of a term within a document. If you want to locate matches for a user's query within a found document, use the MLTE TXNFind function in Carbon or the NSStringrangeOfCharacterFromSet:options: method in Cocoa.
I can't find any documentation on this method. If are familiar with it, I would appreciate any help you could provide.
Also, I'm thinking that the program I have in mind (since it's quite basic) may already be written and available some where. If you are aware of anything, I'd appreciate your help,
Thanks,
David
===============================
Listing 3-19 A complete search method
//.......................................................................... |
// specify the maximum number of hits
|
#define kSearchMax 1000 |
|
- (void) search |
{ |
//.......................................................................... |
// set up search options
|
|
SKSearchOptions options = kSKSearchOptionDefault; |
|
if ([searchOptionNoRelevance intValue]) options |= kSKSearchOptionNoRelevanceScores; |
if ([searchOptionSpaceIsOR intValue]) options |= kSKSearchOptionSpaceMeansOR;
|
if ([searchOptionSpaceFindSimilar intValue]) options |= kSKSearchOptionFindSimilar; |
|
//.......................................................................... |
// get the user's query
|
|
NSString * query = [searchField stringValue]; |
|
//.......................................................................... |
// create an asynchronous search object
|
|
SKSearchRef search = SKSearchCreate ( |
skIndex, |
(CFStringRef) query, |
options |
); |
[(id) search autorelease]; |
|
//.......................................................................... |
// get matches from a search object
|
|
Boolean more = true; |
UInt32 totalCount = 0; |
|
while (more) { |
|
SKDocumentID foundDocIDs [kSearchMax]; |
float foundScores [kSearchMax]; |
SKDocumentRef foundDocRefs [kSearchMax]; |
|
float * scores; |
Boolean unranked = options & kSKSearchOptionNoRelevanceScores; |
|
if (unranked) { |
scores = NULL; |
} else { |
scores = foundScores; |
} |
|
CFIndex foundCount = 0; |
CFIndex pos; |
|
more = SKSearchFindMatches ( |
search, |
kSearchMax, |
foundDocIDs, |
scores, |
1, // maximum time before func returns, in seconds |
&foundCount
|
); |
|
totalCount += foundCount; |
|
//.......................................................................... |
// get document locations for matches and display results.
|
// alternatively, you can collect results over iterations of this loop |
// for display later.
|
|
SKIndexCopyDocumentRefsForDocumentIDs ( |
(SKIndexRef) skIndex, |
(CFIndex) foundCount, |
(SKDocumentID *) foundDocIDs, |
(SKDocumentRef *) foundDocRefs |
); |
|
for (pos = 0; pos < foundCount; pos++) { |
SKDocumentRef doc = (SKDocumentRef) [(id) foundDocRefs [pos] autorelease]; |
NSURL * url = "" SKDocumentCopyURL (doc) autorelease];
|
NSString * urlStr = [url absoluteString]; |
|
NSString * desc; |
|
if (unranked) { |
desc = [NSString stringWithFormat: @"---\nDocID: %d, URL: %@", (int) foundDocIDs [pos], urlStr];
|
} else { |
desc = [NSString stringWithFormat: @"---\nDocID: %d, Score: %f, URL: %@", (int) foundDocIDs[ pos], foundScores [pos], urlStr];
|
} |
[self log: desc]; |
} |
} |
|
NSString * desc = [NSString stringWithFormat: @"\"%@\" - %d matches", query, (int) totalCount];
|
[self log: desc]; |
} |
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