从iPad调用Web service

最新推荐文章于 2024-08-13 10:01:57 发布

翻译最新推荐文章于 2024-08-13 10:01:57 发布 · 386 阅读

文章标签：

#service #web #ipad #soap #encoding #url

本文介绍如何使用Objective-C通过SOAP协议发起WebService请求。包括构建SOAP请求包、设置HTTP头部信息、发送POST请求及处理响应数据等步骤。

1, 建立SOAP请求包:

NSString *soapMsg =
    [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:Body>"
         "<FindCountryAsXml xmlns=\"http://www.ecubicle.net/webservices/\">"
         "<V4IPAddress>%@</V4IPAddress>"
         "</FindCountryAsXml>"
         "</soap:Body>"
         "</soap:Envelope>",  ipAddress.text
];

2.建立调用请求URL对象，使用NSMutableURLRequest and NSURL实例

NSURL *url = [NSURL URLWithString:@"http://www.ecubicle.net/iptocountry.asmx"];
    NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];

3.构筑请求内容，如Content-Type, SOAPAction, and Content-Length. 并且设定HTTP method and HTTP body

NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMsg length]];
    [req addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [req addValue:@"http://www.ecubicle.net/webservices/FindCountryAsXml"
        forHTTPHeaderField:@"SOAPAction"];
    [req addValue:msgLength forHTTPHeaderField:@"Content-Length"];

    [req setHTTPMethod:@"POST"];
    [req setHTTPBody:
[soapMsg dataUsingEncoding:NSUTF8StringEncoding]];

4.在实际请求Web service前, 启动请求等待动画, 提供一个可视化的提示给用户，说明正在请求Web service:

[activityIndicator startAnimating];

5.建立和Web service的连接

conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];
    if (conn) {
        webData = [[NSMutableData data] retain];
    }

6.其他的和连接数据库的方式是一样的

当请求结束后，

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

    [activityIndicator stopAnimating];

    [connection release];
    [webData release];
}