NSFileHandle 可以对图片 其他的进行读写

//
//  main.m
//  NSFileHandler
//
//  Created by MAC on 15/12/26.
//  Copyright © 2015年 MAC. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        //  NSFileHandler 可以读取图片 接口 管道

        //读取
        NSString *path = @"/tmp/test100000.txt";
        NSFileHandle *readingHandle = [NSFileHandle fileHandleForReadingAtPath:path];
        NSData *data = [readingHandle readDataToEndOfFile];
        NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
        NSLog(@"%@",str);

        //写
        NSString *path1 = @"/tmp/test100000.txt";
        NSFileHandle *writingHandle = [NSFileHandle fileHandleForWritingAtPath:path1];
        NSString *string = @"hahahahahahhaa";
        data = [string dataUsingEncoding:NSUTF8StringEncoding];
        [writingHandle writeData:data];
        //更新
        NSString *path2 = @"/tmp/test2.txt";
        NSFileHandle *updatingHandle = [NSFileHandle fileHandleForUpdatingAtPath:path2];

    }
    return 0;
}