关于解压缩与ios cocoa

概述A： 先看cocoa的mac程序，怎么设计用来解压缩一个文件，这个原理有点类似我们采用zip／del命令来 *** 作了，请看以下代码，很直接的NSTASK： ＝＝＝＝ -(IBAction)unarchiveFile:(id)sender{ if(self.filePath == nil) { NSAlert *alert = [NSAlert alertWithMessageTex

A：

先看cocoa的mac程序，怎么设计用来解压缩一个文件，这个原理有点类似我们采用zip／del命令来 *** 作了，请看以下代码，很直接的NSTASK：

＝＝＝＝

-(IBAction)unarchivefile:(ID)sender{    if(self.filePath == nil)

{        NSAlert *alert = [NSAlert alertWithMessageText:@"Error"                                         defaultbutton:@"OK"                                       alternatebutton:nil                                           otherbutton:nil                             informativeTextWithFormat:@"You need to select a file path"];        [alert runModal];  //Alert the user and backout of the method if the file path hasn't been       

 return;    }   

 NSOpenPanel *oPanel = [[NSOpenPanel alloc] init]; //this lets the user choose where to extract the file to.     [oPanel setCanChoosefiles:NO];   

 [oPanel setCanChooseDirectorIEs:YES];    [oPanel setCanCreateDirectorIEs:YES]; 

//May as well do this,UX and all.    

NSInteger choice = [oPanel runModal];    if(choice == NSOKbutton){        Nsstring *extractPath = [[Nsstring alloc] initWithString: [[oPanel URL]path]];        NSArray *arguments = [NSArray arrayWithObject:self.filePath];        NSTask *unzipTask = [[NSTask alloc] init];        [unzipTask setLaunchPath:@"/usr/bin/unzip"]; //this is where the unzip application is on the system.        [unzipTask setCurrentDirectoryPath:extractPath]; //this means we only have to pass one argument,the path to the zip.        [unzipTask setArguments:arguments];        [unzipTask launch];    }}

NSOPENPanel／ 用于打开文件／选择后canchoosefile，然后判断选择的正确性／choice＝[oPanel runModal].

建立一个task后，我们可以执行参数（先要设置参数）；最后调用unziptask launch，但如何确保执行成功的。

You can only use an instance of NSTask once. Yeah. Once you’ve run your NSTask,you need to create a new one.。。。

唯一运行任务，需要检测数据。。。

B：由于ios上没有NSTASK，所以需要考虑另外一套方式，最好的是在下载，复制过程中就完成了解压缩：

1.

I am develoPing an application in which I am getting a zipped XML file from web service. Now I need to unzip it and I have to parse it. How can I unzip an XML file coming from web service

还是需要下载后 *** 作

2.

看起来没有那么好的下载过程就可以unzip

i can read HTML files Now but how to download a zip file and extract it locally so that i can use that in my app plz 

http://code.Google.com/p/ziparchive/

ZipArchive is an Objective-C class to compress or uncompress zip files,which is base on open source code "MiniZip".

It can be used for iPhone application development,and cocoa on Mac OSX as well.

不晓得这个压缩是不是统一规范的，否则双方不通 总结

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