使用POST方法下载XML文件并将其存储在文档目录中

问题描述：

但是，使用我的post方法从服务器获得答复方面取得了成功，但是，我在下载xml文件数据时遇到了问题。使用POST方法下载XML文件并将其存储在文档目录中

这是帖子的方法（我已经搜查计算器）

//We begin by creating our POST's body as an NSString, and converting it to NSData. 
NSString *post = [NSString stringWithFormat:@"device_unique_key=%@&provision_type=c", deviceUniqueKey]; 
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; 

//Next up, we read the postData's length, so we can pass it along in the request. 
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]]; 

//Now that we have what we'd like to post, we can create an NSMutableURLRequest, and include our postData. 
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; 
[request setURL:[NSURL URLWithString:@"http://192.168.1.166/autoprovision/sip_setup/downloadSipSetup"]]; 
[request setHTTPMethod:@"POST"]; 
[request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 
[request setHTTPBody:postData]; 

//And finally, we can send our request, and read the reply by creating a new NSURLSession: 
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]]; 
[[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 
    NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; 

    xmlData = data; //This is the data that I try to donwload as xml file. 

    NSLog(@"requestReply: %@", requestReply); 
}] resume];

我xmlData = data //从dataTaskRequest

那么这里就是我的XMLDATA保存到文件的目录代码

// Display the network activity indicator 
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES]; 

// Perform the request on a new thread so we don't block the UI 
dispatch_queue_t downloadQueue = dispatch_queue_create("Download queue", NULL); 
dispatch_async(downloadQueue, ^{ 

    NSError* err = nil; 
    NSHTTPURLResponse* rsp = nil; 

    // Perform the request synchronously on this thread 
    NSData *rspData = [NSURLConnection sendSynchronousRequest:request returningResponse:&rsp error:&err]; 

    // Once a response is received, handle it on the main thread in case we do any UI updates 
    dispatch_async(dispatch_get_main_queue(), ^{ 
     // Hide the network activity indicator 
     [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; 

     if (rspData == nil || (err != nil && [err code] != noErr)) { 
      // If there was a no data received, or an error... 

     } else { 

      // Cache the file in the cache directory 
      NSArray* paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); 
      path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"init.xml"]; 

      [[NSFileManager defaultManager] removeItemAtPath:path error:nil]; 
      [xmlData writeToFile:path atomically:YES]; 
      // Do whatever else you want with the data... 

      [self loadDataFromXML]; 
     } 
    }); 

});

问题是，当我使用NSXMLParser解析它时xmlData不起作用。我试图使用一个XML文件，并将其放入我的项目，它解析XML，但我下载的XML数据不会被解析（解析委托没有被调用）。我想我的下载文件的方式是错误的。有人能帮我吗？

您是否尝试将数据转换为字符串（使用'NSUTF8StringEncoding'）并将其记录到控制台？ –

是的，我转换它，并得到正确的数据。这是requestReply字符串。 – theFool

然后，你如何设置你的'NSXMLParser'一定有什么问题。你是否遵循官方文档或一些教程？ –

答

我在我的项目中发现了这个问题。毕竟我的代码是正确的！我没有看到我遵循的代码使用NSCachesDirectory，当我调用xmlData时，我使用了NSDocumentDirectory，这就是为什么它不能被解析。

使用POST方法下载XML文件并将其存储在文档目录中

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