如何将下载的文件解压到文档目录中

Question

我搜索解压在文档目录中下载的 .zip 文件。但我只发现了有关它们的问题，并且没有得到任何适合我的查询的合适答案。

每个人都建议下载一些名为“MiniZip”的 api 文件并使用它。但它的代码量很大，而且我不需要那么多代码。因此，如果我得到一些更少的代码来解压缩文件并使用它，那对我来说将是非常好的。它是从 URL 中下载的，与存储时完全相同，但我不知道如何解压缩并在文档目录中使用它。任何人都可以通过提供一些示例代码或建议我来帮助我。

以下代码是使用 url 下载我的 zip 文件的代码。

-(IBAction)download:(id)sender{

    NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://some url contains .zip file"]  cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];                                                                        
    NSURLConnection  *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

    if (theConnection) {
        // Inform the user that the download failed.
        recievedData=[[NSMutableData data ]retain];

    //  [recievedData writeToFile:path atomically:YES];
        NSLog(@"download ");
    }
    else {
        NSLog(@"download fail");
    }
}


-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{

        [recievedData setLength:0];
    }

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{

    [recievedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection
  didFailWithError:(NSError *)error
{
        [connection release];

    [recievedData release];

    // inform the user
    NSLog(@"Connection failed! Error - %@ %@",
          [error localizedDescription],
          [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}



- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // do something with the data
    // receivedData is declared as a method instance elsewhere
    NSLog(@"Succeeded! Received %d bytes of data",[recievedData length]);

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *path=[documentsDirectory stringByAppendingPathComponent:@"books"];
    NSLog(@"value of the path is:%@",path);
    [recievedData writeToFile:[path stringByAppendingPathComponent:@"file"] atomically:YES];

    [connection release];
    [recievedData release];
}   

Answer 1

MiniZip 是否会给您带来任何性能问题？

如果没有，请查看 objective-zip。