OC 文件基本操作

//
//  main.m
//  oc_13
//
//  Created by ma c on 15/12/17.
//  Copyright (c) 2015年 博文科技. All rights reserved.
//

#import <Foundation/Foundation.h>
#define FILEPATH @"/Users/mac/Desktop/"
#define FILEPATH1 @"/Users/mac/Desktop/bowen.txt"


int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        // NSLog(@"Hello, World!");
        
        //NSFileManager 文件管理类（操作文件）
        //NSFileHandle 文件句柄(光标)类（操作文件内容）
        
        /*
         NSFileManager 文件管理类（操作文件）
         1.创建文件夹/文件
         2.读取文件
         3.拷贝文件
         4.移动文件（重命名文件）
         5.删除文件
         6.杂项操作
         7.文件遍历
         
         
         NSFileHandle 文件句柄(光标)类（操作文件内容）
         1.文件写入
         2.文件读取
         
         */
        //----------NSFileManager 文件管理类（操作文件）---------//

        //单例模式
        //创建文件
        NSFileManager *fm = [NSFileManager defaultManager];
        NSString *fileName = @"bowen.txt";
        NSString *filePath = [FILEPATH stringByAppendingPathComponent:fileName];
        NSString *content = @"here is a string";
        NSData *fileData = [content dataUsingEncoding:NSUTF8StringEncoding];
        
        BOOL flag = [fm createFileAtPath:filePath contents:fileData attributes:nil];
        
        if (flag) {
            NSLog(@"文件创建成功");
        }
        else
            NSLog(@"文件创建失败");
        
        
        //创建文件夹
        NSFileManager *fm1 = [NSFileManager defaultManager];
        
        NSString *directoryName = @"bowen";
        NSString *directoryPath = [FILEPATH stringByAppendingPathComponent:directoryName];
        
        
        BOOL flag1 = [fm1 createDirectoryAtPath:directoryPath withIntermediateDirectories:YES attributes:nil error:nil];
        
        if (flag1) {
            NSLog(@"文件夹创建成功");
        }
        else
            NSLog(@"文件夹创建失败");
        
        // 读取文件
        NSFileManager *fm2 = [NSFileManager defaultManager];
        
        NSString *fileName1 = @"bowen.txt";
        NSString *filePath1 = [FILEPATH stringByAppendingPathComponent:fileName1];

        NSData *fileData1 = [fm2 contentsAtPath:filePath1];
        NSString *fileContents = [[NSString alloc] initWithData:fileData1 encoding:NSUTF8StringEncoding];
        NSLog(@"%@",fileContents);
        
        
        // 移动文件
        NSFileManager *fm3 = [NSFileManager defaultManager];
        
        NSString *oldName = @"bowen.txt";
        NSString *oldPath = [FILEPATH stringByAppendingPathComponent:oldName];
        NSString *newName = @"bowen/newBowen.txt";
        NSString *newPath = [FILEPATH stringByAppendingPathComponent:newName];
        
        BOOL flag2 = [fm3 moveItemAtPath:oldPath toPath:newPath error:nil];
      
        if (flag2) {
            NSLog(@"移动成功");
        }
        else
            NSLog(@"移动失败");

        
        
        //删除文件
        NSFileManager *fm5 = [NSFileManager defaultManager];
        
        NSString *fileName2 = @"bowen.txt";
        NSString *filePath2 = [FILEPATH stringByAppendingPathComponent:fileName2];
        
        BOOL flag4 = [fm5 removeItemAtPath:filePath2 error:nil];
        if (flag4) {
            NSLog(@"文件删除成功");
        }else
            NSLog(@"文件删除失败");
        
        
        //拷贝文件
        NSFileManager *fm4 = [NSFileManager defaultManager];
        
        NSString *fromName = @"bowen/newBowen.txt";
        NSString *fromPath = [FILEPATH stringByAppendingPathComponent:fromName];
        NSString *atName = @"bowen.txt";
        NSString *atPath =[FILEPATH stringByAppendingPathComponent:atName];
        
        BOOL flag3 = [fm4 copyItemAtPath:fromPath toPath:atPath error:nil];
        
        if (flag3) {
            NSLog(@"文件拷贝成功");
        }else
            NSLog(@"文件拷贝失败");

        
        //杂项操作
        NSFileManager *fm6 = [NSFileManager defaultManager];
        NSString *fileName3 = @"bowen.txt";
        NSString *filePath3 = [FILEPATH stringByAppendingPathComponent:fileName3];
        
        BOOL flag5 = [fm6 fileExistsAtPath:filePath3];
        
        if (flag5) {
            NSDictionary *infoDic = [fm6 attributesOfItemAtPath:filePath3 error:nil];
            NSLog(@"%@",infoDic);
            NSString *size = [infoDic objectForKey:NSFileSize];
            NSLog(@"文件大小：%@",size);
        }
        else
            NSLog(@"文件不存在");
        
        //文件遍历（浅遍历，深遍历）
        
        NSFileManager *fm7 = [NSFileManager defaultManager];
        
        NSString *directoryName2 = @"bowen";
        NSString *directoryPath2 = [FILEPATH stringByAppendingPathComponent:directoryName2];
        //浅遍历
        NSArray *fileArr = [fm7 contentsOfDirectoryAtPath:directoryPath2 error:nil];
        NSLog(@"%@",fileArr);
        //深遍历
        NSArray *allFileArr = [fm7 subpathsOfDirectoryAtPath:directoryPath2 error:nil];
        NSLog(@"%@",allFileArr);
        
        
        
        
        //-----------NSFileHandle 文件句柄类（操作文件内容）------------//
        //文件读取
        NSFileHandle *fh = [NSFileHandle fileHandleForReadingAtPath:FILEPATH1];
        
        
        NSData *fileData2 = [fh readDataOfLength:4];
        NSString *dataStr = [[NSString alloc] initWithData:fileData2 encoding:NSUTF8StringEncoding];
        NSLog(@"%@",dataStr);
        
        
        NSData *fileData3 = [fh readDataOfLength:4];
        NSString *dataStr1 = [[NSString alloc] initWithData:fileData3 encoding:NSUTF8StringEncoding];
        NSLog(@"%@",dataStr1);
        
        [fh seekToFileOffset:0];//移动光标位置
        
        NSData *fileData4 = [fh readDataToEndOfFile];
        NSString *dataStr2 = [[NSString alloc] initWithData:fileData4 encoding:NSUTF8StringEncoding];
        NSLog(@"%@",dataStr2);
        
        //文件写入
        NSFileHandle *fh1 =[NSFileHandle fileHandleForWritingAtPath:FILEPATH1];
        
        NSString *contents1 = @"Hello Horld";
        NSData *contents1Data =[contents1 dataUsingEncoding:NSUTF8StringEncoding];
        
        //[fh1 truncateFileAtOffset:0];//只能在写入的时候用-移动光标位置
        [fh1 writeData:contents1Data];
        
    }
    return 0;
    
}