Objective-C学习－查找文件

//  ocStudy

//  main.m

// 

//  从主目录开始，找出所有扩展名为jpg的文件的路径

//  Created by mark on 11-10-30.

//  Copyright 2011年 __MyCompanyName__. All rights reserved.

//

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])

{

    @autoreleasepool {

       
        NSFileManager *manger;

        manger =[NSFileManager defaultManager];//建立一个文件管理器

       
       
        NSString *home;

        home= [@"~" stringByExpandingTildeInPath];//～是一个代表主目录的速记符，这个方法调用是指定主目录到home

       
        NSMutableArray *file;

        file = [NSMutableArray arrayWithCapacity: 42];//新建一个可变数组，42是随便填的，不影响数组扩展，你也可以写41，随你喜好

       
       
        for (NSString *filename in [manger enumeratorAtPath: home]){//遍历每个文件路径，找出扩展名为jpg的文件，比起建立两个枚举器（下面注释部分）用快速枚举方法能更轻松快捷地访问数组的每个元素

            if ([[filename pathExtension]

                        isEqualTo: @"jpg"]) {

                [file addObject: filename];

            }

        }

        for (NSString *filename in file ) {

            NSLog(@"%@", filename);

        }

//        NSDirectoryEnumerator *direnum;

//        direnum = [manger enumeratorAtPath: home];

//       

//       

//        NSString *filename;

//        while (filename = [direnum nextObject]) {

//            if ([[filename pathExtension] isEqualTo: @"jpg"]) {

//                [file addObject: filename];

//            }

//        }

//       

//        NSEnumerator *fileenum;

//        fileenum = [file objectEnumerator];

//       

//        while (filename = [fileenum nextObject]) {

//            NSLog(@"%@" , filename);

//        }

       
       
    }

    return 0;

}

输出如下（部分）：

2011-10-30 04:45:55.104 ocStudy[309:707] Desktop/未命名_meitu_1.jpg

2011-10-30 04:45:55.105 ocStudy[309:707] Desktop/软件及驱动/QQ.app/Contents/Resources/guide1.jpg

2011-10-30 04:45:55.106 ocStudy[309:707] Desktop/软件及驱动/QQ.app/Contents/Resources/guide2.jpg

2011-10-30 04:45:55.106 ocStudy[309:707] Desktop/软件及驱动/QQ.app/Contents/Resources/guide3.jpg

2011-10-30 04:45:55.107 ocStudy[309:707] Desktop/软件及驱动/QQ.app/Contents/Resources/guide4.jpg

2011-10-30 04:45:55.107 ocStudy[309:707] Desktop/软件及驱动/QQ.app/Contents/Resources/guide5.jpg

2011-10-30 04:45:55.108 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F00/GKTL.jpg

2011-10-30 04:45:55.108 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F00/YDFF.jpg

2011-10-30 04:45:55.109 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F01/AJFW.jpg

2011-10-30 04:45:55.109 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F02/PXMW.jpg

2011-10-30 04:45:55.110 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F02/TBIY.jpg

2011-10-30 04:45:55.110 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F05/JIJV.jpg

2011-10-30 04:45:55.111 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F05/MUGA.jpg

2011-10-30 04:45:55.111 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F05/NXON.jpg

2011-10-30 04:45:55.112 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F06/JRWJ.jpg

2011-10-30 04:45:55.112 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F06/UQTD.jpg

2011-10-30 04:45:55.113 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F07/GWGQ.jpg

2011-10-30 04:45:55.113 ocStudy[309:707] Library/Application Support/iPhone Simulator/User/Media/Photos/Thumbs/F07/USPA.jpg