http://blog.csdn.net/ztp800201/article/details/7814913
NSFileHandle常用操作
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+(NSFileHandle*)fileHandleForReadingAtPath:path
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+(NSFileHandle*)fileHandleForWritingAtPath:path
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+(NSFileHandle*)fileHandleForUpdatingAtPath:path
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-(NSData*)availableData
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-(NSData*)readDataToEndOfFile
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-(NSData*)readDataOfLength:(unsigned int)bytes
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-(void)writeData:data
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-(unsigned long long)offsetInFile
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-(void)seekToFileOffset:offset
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-(unsigned long long)seekToEndOfFile
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-(void)truncateFileAtOffset:offset
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-(void)closeFile
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