使用 POST 方法下载 XML 文件并将其存储在文档目录中

Question

我使用 post 方法成功地从服务器获得了回复，但是，我在下载 xml 文件数据时遇到问题。

这是我的 Post 方法（我在 Whosebug 中搜索过）

//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];

我有 xmlData = data // 来自 dataTaskRequest

然后这是我将xml数据保存到文档目录

的代码

// 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 解析数据时，xml数据无法正常工作。我尝试使用 xml 文件并将其放入我的项目中，它解析 xml 但我下载的 xml 数据未被解析（未调用解析委托）。我认为我下载文件的方式是错误的。有人可以帮助我吗？

Answer 1

我在我的项目中发现了问题。毕竟我的代码是正确的！我没有看到我遵循的代码使用了 NSCachesDirectory 并且当我调用 xmlData 时我使用了 NSDocumentDirectory 这就是它没有被解析的原因。

使用 POST 方法下载 XML 文件并将其存储在文档目录中

Download XML File with POST Method and Store it in Document's Directory

post

objective-c

nsxmlparser

ios