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    <pre><code>- (unsigned long long) folderSizeWithFSRef:(FSRef*)theFileRef { FSIterator thisDirEnum = NULL; unsigned long long totalSize = 0; // Iterate the directory contents, recursing as necessary if (FSOpenIterator(theFileRef, kFSIterateFlat, &amp;thisDirEnum) == noErr) { const ItemCount kMaxEntriesPerFetch = 256; ItemCount actualFetched; FSRef fetchedRefs[kMaxEntriesPerFetch]; FSCatalogInfo fetchedInfos[kMaxEntriesPerFetch]; OSErr fsErr = FSGetCatalogInfoBulk(thisDirEnum, kMaxEntriesPerFetch, &amp;actualFetched, NULL, kFSCatInfoDataSizes | kFSCatInfoRsrcSizes | kFSCatInfoNodeFlags, fetchedInfos, fetchedRefs, NULL, NULL); while ((fsErr == noErr) || (fsErr == errFSNoMoreItems)) { ItemCount thisIndex; for (thisIndex = 0; thisIndex &lt; actualFetched; thisIndex++) { // Recurse if it's a folder if (fetchedInfos[thisIndex].nodeFlags &amp; kFSNodeIsDirectoryMask) { totalSize += [self folderSizeWithFSRef:&amp;fetchedRefs[thisIndex]]; } else { // add the size for this item totalSize += fetchedInfos[thisIndex].dataLogicalSize; totalSize += fetchedInfos[thisIndex].rsrcLogicalSize; } } if (fsErr == errFSNoMoreItems) { break; } else { // get more items fsErr = FSGetCatalogInfoBulk(thisDirEnum, kMaxEntriesPerFetch, &amp;actualFetched, NULL, kFSCatInfoDataSizes | kFSCatInfoRsrcSizes | kFSCatInfoNodeFlags, fetchedInfos, fetchedRefs, NULL, NULL); } } FSCloseIterator(thisDirEnum); } return totalSize; } - (unsigned long long) sizeOfFileWithURL:(NSURL *)aURL { NSDictionary *attr = [[NSFileManager defaultManager] attributesOfItemAtPath:aURL.path error:nil]; if ([attr objectForKey:NSFileType] == NSFileTypeDirectory) { FSRef theFileRef; CFURLGetFSRef((__bridge CFURLRef)aURL, &amp;theFileRef); return [self folderSizeWithFSRef:&amp;theFileRef]; } else { return [[attr objectForKey:NSFileSize] longValue]; } } </code></pre> <p>I also noticed that finder does not divide by 1024, but by 1000 when calculating size. Strange</p>
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    1. POHow to calculate the size of a folder. (This size must agree with Finder.)
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    1. POHow to calculate the size of a folder. (This size must agree with Finder.)
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    1. COYou should add rsrcLogicalSize as well as dataLogicalSize.
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    2. COThanks, corrected it
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    3. COAnd I rechecked, file-bytes are exactly the same as in Finder.
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