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:];
         NSString *dataStr = [[NSString alloc] initWithData:fileData2 encoding:NSUTF8StringEncoding];
         NSLog(@"%@",dataStr);

         NSData *fileData3 = [fh readDataOfLength:];
         NSString *dataStr1 = [[NSString alloc] initWithData:fileData3 encoding:NSUTF8StringEncoding];
         NSLog(@"%@",dataStr1);

         [fh seekToFileOffset:];//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 ;

 }