Thanks very much for the suggestion. I've just given that a try, but it
doesn't make any difference. The enumeration still stops early, but the error
handler block doesn't get called, making me think there's no error; the
enumeration simply thinks it's finished.
Anything else I could try. FWIW, I've just installed 10.8 and it's still
happening.
M
On 27 Jul 2012, at 18:10, Kevin Perry <kpe...@apple.com> wrote:
> You should probably try -[NSFileManager
> enumeratorAtURL:includingPropertiesForKeys:options:errorHandler:]. The
> errorHandler block will give you more detail about any errors that occur in
> the middle of the enumeration (and give you the ability to ignore them).
>
> -KP
>
> On Jul 27, 2012, at 9:44 AM, Mark Allan <markjal...@blueyonder.co.uk> wrote:
>
>> Hi all,
>>
>> Apologies for asking a question which has been asked many times before, but
>> I can't seem to find an answer to this particular one.
>>
>> I'm trying to list a directory recursively to build up a snapshot of the
>> contents and store them in a core data DB, but keep running into issues with
>> the directory list. The core data part is working fine as far as I can tell!
>>
>> I've tried writing a recursive method to call scandir() until the whole tree
>> has been visited, but I'm coming unstuck converting NSStrings to const char*
>> to char*. Unless I supply the path directly as a hard-coded C-string
>> "/Users/mark", it works for a while, but then sometimes it forgets to add
>> "/Users/mark" and starts scanning directories at the root of my HD! Hard
>> coding the C string works perfectly but obviously isn't an option.
>>
>> -(void) scan: (char *)theDir{
>> struct dirent **namelist;
>> int n;
>> size_t thisDirLength = strlen(theDir);
>>
>> n = scandir(theDir, &namelist, 0, NULL);
>> if (n < 0){
>> perror("scandir");
>> }
>> else {
>> while(n--) {
>> theCounter++;
>> if (theCounter >= 1000) {
>> theCounter = 0;
>> [[self managedObjectContext] save:NULL];
>> [[self managedObjectContext] reset];
>> [thePool drain];
>> thePool = [[NSAutoreleasePool alloc] init];
>> }
>> if ((strcmp(namelist[n]->d_name,".") != 0) &&
>> (strcmp(namelist[n]->d_name,"..") != 0)) {
>> char* fullPath = malloc(thisDirLength +
>> strlen(namelist[n]->d_name) + 2);
>> strcpy(fullPath, theDir);
>> strcat(fullPath, "/");
>> strcat(fullPath, namelist[n]->d_name);
>>
>> [self addEntityWithPath:[NSString
>> stringWithCString:fullPath encoding:NSUTF8StringEncoding]];
>>
>> if (namelist[n]->d_type == DT_DIR) {
>> [self scan:fullPath];
>> }
>> free(fullPath);
>> }
>> free(namelist[n]);
>> }
>> free(namelist);
>> }
>> }
>>
>>
>> I then gave up on that approach and opted for the easier but slower cocoa
>> solution (NSDirectoryEnumerator) but for some reason it gives up with
>> neither an error nor a warning about half way through the tree. Could it be
>> that modifications to the file system during the enumeration are causing it
>> to fail?
>>
>>
>> -(void) startSnapshotForPath:(NSString *) thePath {
>> int theCounter = 0;
>> NSDirectoryEnumerator *dirEnumerator = [[NSFileManager defaultManager]
>> enumeratorAtPath: thePath];
>> thePool = [[NSAutoreleasePool alloc] init];
>>
>> for (NSString *theSubPath in dirEnumerator) {
>> [self addEntityWithPath:[thePath
>> stringByAppendingPathComponent:theSubPath]];
>> theCounter++;
>> if (theCounter >= 1000) {
>> theCounter = 0;
>> [[self managedObjectContext] save:NULL];
>> [[self managedObjectContext] reset];
>> [thePool drain];
>> thePool = [[NSAutoreleasePool alloc] init];
>> }
>> }
>>
>> [[self managedObjectContext] save:NULL];
>> [[self managedObjectContext] reset];
>> [thePool drain];
>> }
>>
>> I've also tried Uli Kusterer's UKDirectoryEnumerator but that doesn't appear
>> to be recursive! I suspect (although I haven't tried) that requesting the
>> type of the path (i.e. file/directory) and creating a new
>> UKDirectoryEnumerator for each subdirectory would be massively expensive.
>>
>> Does anyone have any suggestions for where I can go from here please? How
>> can I find out why NSDirectoryEnumerator is failing half-way through the
>> process, and how can I stop it doing so? Failing that, does anyone have a
>> better suggestion for how I can build the snapshot please?
>>
>> Many thanks
>> Mark
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