//
// main.m
// OC9_文件操作
//
// Created by zhangxueming on 15/6/19.
// Copyright (c) 2015年 zhangxueming. All rights reserved.
//
#import <Foundation/Foundation.h>
int main(
int argc,
const char *
argv[]) {
@autoreleasepool {
//文件句柄
//以只读的方式创建文件句柄
//+ (instancetype)fileHandleForReadingAtPath:(NSString *)path;
//以只写的方式创建文件句柄
//+ (instancetype)fileHandleForWritingAtPath:(NSString *)path;
//以可读可写的方式创建文件句柄
NSFileHandle *fh = [NSFileHandle fileHandleForUpdatingAtPath:
@"/Users/zhangxueming/Desktop/Test/1.txt"];
//移动文件指针到文件末尾
[fh seekToEndOfFile];
//写文件
NSData *data1 = [
@"qianfenghulian" dataUsingEncoding:NSUTF8StringEncoding];
[fh writeData:data1];
NSData *data2 = [
@"千锋互联" dataUsingEncoding:NSUTF8StringEncoding];
[fh writeData:data2];
//把文件的内容同步到磁盘中
[fh synchronizeFile];
[fh closeFile];//文件句柄消失的时候, 对应的文件也会关闭;
NSFileHandle *fh1 = [NSFileHandle fileHandleForUpdatingAtPath:
@"/Users/zhangxueming/Desktop/Test/2.txt"];
//读取文件内容到文件末尾
// NSData *data3 = [fh1 readDataToEndOfFile];
// NSLog(@"data3 = %@", [[NSString alloc] initWithData:data3 encoding:NSUTF8StringEncoding]);
//移动文件指针到指定位置
[fh1 seekToFileOffset:
6];
//读取文件指定长度大小
NSData *data4 = [fh1 readDataOfLength:
9];
NSLog(@"data4 = %@", data4);
NSLog(@"data4 = %@", [[NSString alloc] initWithData:data4 encoding:NSUTF8StringEncoding]);
//截断文件为指定大小
[fh1 truncateFileAtOffset:
30];
}
return 0;
}
转载于:https://www.cnblogs.com/0515offer/p/4589604.html
