day08-03-文件拷贝器

Objective-c

//  main.m
//  day08-03-文件拷贝器
//
//  Created by Aaron on 15/7/10.
//  Copyright (c) 2015年 Aaron. All rights reserved.
//
#import <Foundation/Foundation.h>
/*
 自己封装一个单例类,实现一个拷贝器
    功能:实现文件拷贝
 */
#import "CopyManager.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        CopyManager *manager = [CopyManager defaultManager];
        NSLog(@"%@",manager);
//        BOOL rec = [manager copyFileFromPath:@"/users/qianfeng/desktop/file1.txt" toPath:@"/users/qianfeng/desktop/file2.txt"];
//        NSLog(@"%@",rec?@"成功":@"失败");
    }
    return 0;
}

#import <Foundation/Foundation.h>
@interface CopyManager : NSObject
+(instancetype)defaultManager;
-(BOOL)copyFileFromPath:(NSString *)oldPath toPath:(NSString *)newPath;
@end

#import "CopyManager.h"
@implementation CopyManager
//创建单列
static CopyManager *manager = nil;
//系统自己调用
+(void)initialize
{
    manager = [[self alloc] init];
    NSLog(@"我是初始化");
}
+(instancetype)defaultManager
{
    return manager;
}
-(BOOL)copyFileFromPath:(NSString *)oldPath toPath:(NSString *)newPath
{
    //判断源文件是否存在
    BOOL isExist = NO;
    BOOL isDir = NO;
    NSFileManager *manager = [NSFileManager defaultManager];
    isExist = [manager fileExistsAtPath:oldPath isDirectory:&isDir];
    if(isExist)
    {
        if(!isDir)
        {
            BOOL createSuc = [manager createFileAtPath:newPath contents:nil attributes:nil];
            if(createSuc)
            {
                NSFileHandle *readHandle = [NSFileHandle fileHandleForReadingAtPath:oldPath];
                NSFileHandle *writeHandle = [NSFileHandle fileHandleForWritingAtPath:newPath];
                //拿到文件属性
                NSDictionary *attributes = [manager attributesOfItemAtPath:oldPath error:nil];
                //得到文件大小
                NSInteger length = [attributes[NSFileSize] integerValue];
                while(length>0)
                {
                    if(length > 100)
                    {
                        NSData *data = [readHandle readDataOfLength:100];
                        [writeHandle writeData:data];
                        length-=100;
                    }
                    else
                    {
                        NSData *data = [readHandle readDataToEndOfFile];
                        [writeHandle writeData:data];
                        length = 0;
                    }
                }
                [writeHandle synchronizeFile];
                [writeHandle closeFile];
                [readHandle closeFile];
                return YES;
            }
        }
    }
    return NO;
}
@end