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ファイルの時間とサイズを取得する

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ファイル属性はNSFileManagerクラスを使えば簡単に取得できます。
参考でC言語のstat(2)を使う方法も載せておきます。詳細はstat(2)のmanpageを参照してください。

NSBundle *bundle = [NSBundle mainBundle];
NSString *path = [bundle pathForResource:@"first" ofType:@"png"];

// NSFileManagerを使ってファイルの属性を取得する
NSFileManager *fm = [NSFileManager defaultManager];
NSDictionary *attribute = [fm attributesOfItemAtPath:path error:nil];
NSDate *creationDate = [attribute objectForKey:NSFileCreationDate];
NSDate *modificationDate = [attribute objectForKey:NSFileModificationDate];
NSNumber *fileSize = [attribute objectForKey:NSFileSize];

// stat(2)を使ってファイルの属性を取得する
// #include <sys/stat.h>
// #include <time.h>
struct stat sb;
memset(&sb, 0x00, sizeof(struct stat));
stat(path.UTF8String, &sb);
struct tm ctime;
memcpy(&ctime, localtime(&sb.st_ctimespec.tv_sec), sizeof(struct tm));
struct tm mtime;
memcpy(&mtime, localtime(&sb.st_mtimespec.tv_sec), sizeof(struct tm));
off_t size = sb.st_size;
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