Objective-C 文件操作
//
// main.m
// KenshinCui
//
// Created by hxd_mac on 15-6-7.
// Copyright (c) 2015年 hxd198. All rights reserved.
//
#import <Foundation/Foundation.h>
void Test1()
{
//读取本地文档
NSString *path = @"/Users/hxd_mac/Documents/developer/KenshinCui/test.txt";
NSString *str1 = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSLog(@"str1 = %@", str1);
NSError *error;
NSString *str2 = [NSString stringWithContentsOfFile:path encoding:kCFStringEncodingGB_18030_2000 error:&error];
//错误处理
if (error) {
NSLog(@"read error ,the error is %@", error);
} else {
NSLog(@"read success, the file contens of is %@", str2);
}
//读取网络文档
// NSURL *url = [NSURL URLWithString:@"http://www.apple.com/"];
//
// NSString *str3 = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
//
// NSLog(@"str3 = %@", str3);
}
void Test2()
{
//文件写入
NSString *path = @"/Users/hxd_mac/Documents/developer/KenshinCui/test2.txt";
NSError *error;
NSString *string = @"hello world!";
[string writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error];
if (error) {
NSLog(@"write fail!");
} else {
NSLog(@"write success %@", string);
}
}
void Test3()
{
//路径操作
NSMutableArray *path = [NSMutableArray array];
[path addObject:@"OC"];
[path addObject:@"apple"];
[path addObject:@"swift"];
NSString *string = [NSString pathWithComponents:path];
NSLog(@"string: %@", string);
NSLog(@"path: %@", [string pathComponents]);
NSLog(@"isAbsolution path %i", [string isAbsolutePath]);
NSLog(@"the last object: %@", [string lastPathComponent]);
NSLog(@"after append: %@", [string stringByAppendingPathComponent:@"iphone"]);
NSLog(@"after delete: %@", [string stringByDeletingLastPathComponent]);
}
void Test4()
{
//扩展名操作
NSString *path = @"/Users/hxd_mac/Documents/developer/KenshinCui/test2.txt";
NSLog(@"find the extend: %@", [path pathExtension]);
NSLog(@"after delete: %@", [path stringByDeletingPathExtension]);
NSLog(@"after append: %@", [path stringByAppendingPathExtension:@"mp3"]);
}
int main(int argc, const char * argv[])
{
@autoreleasepool {
Test1();
Test2();
Test3();
Test4();
}
return 0;
}
输出结果：
2015-06-07 16:15:21.525 KenshinCui[1623:303] str1 = 世界你好
2015-06-07 16:15:21.644 KenshinCui[1623:303] read error ,the error is Error Domain=NSCocoaErrorDomain Code=261 "The file couldn’t be opened using the specified text encoding." UserInfo=0x10010f6a0 {NSFilePath=/Users/hxd_mac/Documents/developer/KenshinCui/test.txt, NSStringEncoding=1586}
2015-06-07 16:15:21.649 KenshinCui[1623:303] write fail!
2015-06-07 16:15:21.651 KenshinCui[1623:303] string: OC/apple/swift
2015-06-07 16:15:21.653 KenshinCui[1623:303] path: (
OC,
apple,
swift
)
2015-06-07 16:15:21.658 KenshinCui[1623:303] isAbsolution path 0
2015-06-07 16:15:21.660 KenshinCui[1623:303] the last object: swift
2015-06-07 16:15:21.662 KenshinCui[1623:303] after append: OC/apple/swift/iphone
2015-06-07 16:15:21.666 KenshinCui[1623:303] after delete: OC/apple
2015-06-07 16:15:21.668 KenshinCui[1623:303] find the extend: txt
2015-06-07 16:15:21.670 KenshinCui[1623:303] after delete: /Users/hxd_mac/Documents/developer/KenshinCui/test2
2015-06-07 16:15:21.671 KenshinCui[1623:303] after append: /Users/hxd_mac/Documents/developer/KenshinCui/test2.txt.mp3