我是 Xcode 的新手，我需要连接到 Web 服务 API (SOAP + DES)，这意味着我必须先向服务器发送用户名、密码、 key 和 IV，然后才能获取 XML 文件，然后解析它。

是否有关于从 iPhone 连接到 Web 服务 API(SOAP + DES)的教程？

    -(IBAction)buttonClick:(id)sender
{
    recordResults = NO;

    NSString *soapMessage = [NSString stringWithFormat:
     @"<?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:Header>"
     "<CredentialSoapHeader xmlns=\"http://tempuri.org/\">"
     "<userID>xxxxx</userID>"
     "<Password>xxxx</Password>"
     "</CredentialSoapHeader>"
     "</soap:Header>"
     "<soap:Body>"
     "<GetNearUserByArticleLatLon xmlns=\"http://tempuri.org/\">"
     "<strXML>"
                             "<XMLDATA>\n"
                             "<KeyWord></KeyWord>\n"
                             "<Lat>0</Lat>\n"
                             "<Lon>0</Lon>\n"
                             "<IP>219.71.65.55</IP>\n"
                             "<CurrentPage>1</CurrentPage>\n"
                             "<PageSize>10</PageSize>\n"
                             "</XMLDATA>\n"
                             "</strXML>"
     "</GetNearUserByArticleLatLon>"
     "</soap:Body>"
     "</soap:Envelope>"];


    NSLog(@"%@", soapMessage);

    //http://www.xignite.com/services/GetRealQuote
    NSURL *url = [NSURL URLWithString:@"http://api3.mmnears.com/API/api.asmx?op=GetNearUserByArticleLatLon"];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
    NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];

    [theRequest addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [theRequest addValue:@"http://tempuri.org/GetNearUserByArticleLatLon" forHTTPHeaderField:@"SOAPAction"];
    [theRequest addValue:msgLength forHTTPHeaderField:@"Content-Length"];
    [theRequest setHTTPMethod:@"POST"];
    [theRequest setHTTPBody:[soapMessage dataUsingEncoding:NSUTF8StringEncoding]];


    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    NSLog(@"theConnection = %@",theConnection);

    if(theConnection)
    {
        webData = [[NSMutableData data] retain];
        NSLog(@"WebData = %@",webData);

    }
    else 
    {
        NSLog(@"theConnection is null");
    }

}


-(void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response
{
    [webData setLength:0];
     NSHTTPURLResponse * httpResponse;

    httpResponse = (NSHTTPURLResponse *) response;

    NSLog(@"HTTP error %zd", (ssize_t) httpResponse.statusCode);

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
{
    [webData appendData:data];
    NSLog(@"webdata: %@", data);

}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError*)error
{
    NSLog(@"error with the connection");
    [connection release];
    [webData release];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"DONE. Received bytes %d", [webData length]);
    NSString *theXML = [[NSString alloc] initWithBytes:[webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
    NSLog(@"xml %@",theXML);
    [theXML release];