objective-c - 街道地址验证

Question

我的用户输入收件人地址(街道地址而非电子邮件)。我需要通过 USPS 验证它，以便我知道它实际上是一个地址。

我现在正在研究他们的 API，我想我理解它，但我不确定如何使用 objective-c 来实现它。

它几乎是这样工作的:

1. 我必须创建一个包含收件人姓名、地址和邮政编码的 XML 请求。
2. 我必须将其发布到他们的服务器
3. 他们以 XML 响应响应

这是他们构造的 XML 请求之一的示例:

http://SERVERNAME/ShippingAPITest.dll?API=Verify&XML=<AddressValidateRequest% 20USERID="xxxxxxx"><Address ID="0"><Address1></Address1>
<Address2>6406 Ivy Lane</Address2><City>Greenbelt</City><State>MD</State> <Zip5></Zip5><Zip4></Zip4></Address></AddressValidateRequest>

有点乱码，但已分解:

http://SERVERNAME/ShippingAPITest.dll?API=Verify&XML=
<AddressValidateRequest% 20USERID="xxxxxxx">
  <Address ID="0">
    <Address1></Address1>
     <Address2>6406 Ivy Lane</Address2>
     <City>Greenbelt</City>
     <State>MD</State>
     <Zip5></Zip5>
     <Zip4></Zip4>
  </Address>
</AddressValidateRequest>

我的第一个想法似乎很明显，但也许有更好的方法来实现它。由于 XML 提要很短，我是否应该通过简单地按照以下方式进行构建:

NSString *request = [NSString stringWithFormat:@"......"]

按照上面发布的行填写和格式化的地方。

第二个问题是如何正确地将其发送到服务器？

我只是创建一个 NSURL 请求，并将 URL 作为构造的 XML 字符串？

这是我所拥有的，但我一直发现 URL 构造错误:

- (void)verifyAddress:(Recipient*)_recipient {

    NSURL *_url = [NSURL URLWithString:@"http://testing.shippingapis.com/ShippingAPITest.dll?API=Verify&XML=<AddressValidateRequest%20USERID=\"********\"><Address ID=\"0\"><Address1></Address1><Address2>6406 Ivy Lane</Address2><City>Greenbelt</City><State>MD</State><Zip5></Zip5><Zip4></Zip4></Address></AddressValidateRequest>"];

    // Create the request.
    NSURLRequest *theRequest=[NSURLRequest requestWithURL:_url
                                              cachePolicy:NSURLRequestUseProtocolCachePolicy
                                          timeoutInterval:60.0];
    // create the connection with the request
    // and start loading the data
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if (theConnection) {
        // Create the NSMutableData to hold the received data.
        // receivedData is an instance variable declared elsewhere.
        receivedData = [NSMutableData data];
        NSString* newStr = [[NSString alloc] initWithData:receivedData
                                                 encoding:NSUTF8StringEncoding];
        NSLog(@"the response '%@'", newStr);
    } else {
        // Inform the user that the connection failed.
        NSLog(@"error");
    }

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // This method is called when the server has determined that it
    // has enough information to create the NSURLResponse.

    // It can be called multiple times, for example in the case of a
    // redirect, so each time we reset the data.

    // receivedData is an instance variable declared elsewhere.
    [receivedData setLength:0];
}

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


    // Append the new data to receivedData.
    // receivedData is an instance variable declared elsewhere.
    [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection
  didFailWithError:(NSError *)error
{

    // inform the user
    NSLog(@"Connection failed! Error - %@ %@",
          [error localizedDescription],
          [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSString* newStr = [[NSString alloc] initWithData:receivedData
                                             encoding:NSUTF8StringEncoding];
    NSLog(@"the response '%@'", newStr);
    // do something with the data
    // receivedData is declared as a method instance elsewhere
    NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]);
}

我收到以下错误:

Connection failed! Error - bad URL (null)

我现在唯一的问题是，就 NSURLConnection 而言，我是否一切正常？我可以玩弄 URL，我只是想确保我的实现没问题，这样我就不会原地踏步了。 :P

Answer 1

您的 URL 中有 % 20。它应该是 %20(没有空格)。

可能还有其他问题，但这是一个很容易发现的问题。如果您收到错误消息，您需要编辑您的问题并粘贴确切错误消息。

此外，您可能会考虑使用 Apple 的 NSURLRequest 和 NSURLConnection 类，因为可能会有更多人熟悉它们，因此您可能更容易找到帮助。