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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