需要从 iOS 中的 NSMutableData 对象中提取 XML 文档

Question

我已成功从 iOS 连接到 .NET Web 服务，并通过 NSLog 将响应 xml 文档打印到控制台。这是我通过 AFNetworking 库进行的。我现在可以通过 NSURLConnection 连接到同一个 Web 服务，但是，我无法提取保存在 NSMutableData 对象中的 xml 文档。 AFNetworking 库能够自动执行此操作，这使事情变得更加容易，但我想知道如何使用本机 iOS 库来执行此操作。这是我正在使用的代码：

//This is the code I am using to make the connection to the web service
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    [request setHTTPBody:[soapBody dataUsingEncoding:NSUTF8StringEncoding]];

    [request setHTTPMethod:@"POST"];

    [request addValue:@"http://tempuri.org/Customers" forHTTPHeaderField:@"SOAPAction"];
    [request addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

    // Convert your data and set your request's HTTPBody property
    NSString *stringData = @"some data";
    NSData *requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];
    request.HTTPBody = requestBodyData;

    // Create url connection and fire request
    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [conn start];

这是我必须从网络服务接收数据的代码：

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

    _responseData = [[NSMutableData alloc] init];
}

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

    [_responseData appendData:data];
}

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
                  willCacheResponse:(NSCachedURLResponse*)cachedResponse {
    return nil;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    // The request is complete and data has been received
    NSString *strData = [[NSString alloc]initWithData:_responseData encoding:NSUTF8StringEncoding];

    NSLog(@"%@", strData);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    // The request has failed for some reason!

}


/*
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        NSLog(@"%@", [operation responseString]);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        NSLog(@"failed");

    }];

    [operation start];
    */

我只是想打印出我收到的整个 xml 文档，而现在不一定要解析该文档。

提前感谢所有回复的人。

Answer 1

查看您服务器上的帮助文档，它提出了一个示例请求：

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Customers xmlns="http://tempuri.org/" />
  </soap:Body>
</soap:Envelope>

所以，我将该示例请求放在一个文本文件中，并通过NSURLConnection 发起请求，如下所示：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

NSString *filename = [[NSBundle mainBundle] pathForResource:@"soap1-1example" ofType:@"xml"];
NSData *requestBodyData = [NSData dataWithContentsOfFile:filename];
request.HTTPBody = requestBodyData;

[request setHTTPMethod:@"POST"];

[request addValue:@"http://tempuri.org/Customers" forHTTPHeaderField:@"SOAPAction"];
[request addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

[NSURLConnection connectionWithRequest:request delegate:self];

注意，我没有调用start，因为as the documentation says 除非您使用“initWithRequest:delegate:startImmediately: 方法并为startImmediately 参数提供NO”，否则它将自动为您启动。实际上，您的原始代码启动了两次连接，这可能有问题。

无论如何，使用我修改后的代码和上述请求，它工作正常，同时使用NSURLConnection 以及AFNetworking。我得到的回应（美化）是：

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
    <CustomersResponse xmlns="http://tempuri.org/">
    <CustomersResult>
        <Customer>
            <FirstName>Mohammad</FirstName>
            <LastName>Azam</LastName>
        </Customer>
        <Customer>
            <FirstName>John</FirstName>
            <LastName>Doe</LastName>
        </Customer>
    </CustomersResult>
</CustomersResponse>
</soap:Body>
</soap:Envelope>

如果它仍然不适合您，也许您可​​以分享您提交的请求的详细信息。

---

顺便说一句，由于这里不需要委托方法（例如，您没有进行流式传输，您没有进行任何身份验证等），因此您可以消除所有 NSURLConnectionDataDelegate 方法（didReceiveResponse， didReceiveData 等），只需使用NSURLConnection 类方法，sendAsynchronousRequest（在 iOS 5 及更高版本中）：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

NSString *filename = [[NSBundle mainBundle] pathForResource:@"soap1-1example" ofType:@"xml"];
NSData *requestBodyData = [NSData dataWithContentsOfFile:filename];
NSAssert(requestBodyData, @"requestBodyData is nil!");
request.HTTPBody = requestBodyData;

[request setHTTPMethod:@"POST"];

[request addValue:@"http://tempuri.org/Customers" forHTTPHeaderField:@"SOAPAction"];
[request addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

if (!self.networkQueue)
{
    self.networkQueue = [[NSOperationQueue alloc] init];
    self.networkQueue.name = @"com.yourdomain.yourapp.networkQueue";
}

[NSURLConnection sendAsynchronousRequest:request
                                   queue:self.networkQueue
                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {

                           if (!error)
                           {
                               NSString *string = [[NSString alloc] initWithData:data
                                                                        encoding:NSUTF8StringEncoding];

                               NSLog(@"%s: data=%@", __FUNCTION__, string);
                           }
                           else
                           {
                               NSLog(@"%s: error=%@", __FUNCTION__, error);
                           }
                       }];