经历了两天的摸索，终于成功获取了数据，因为公司要做一个停车入库的信息查询，所以需要访问webservice的接口，由于没有接触过webservice,所以第一天就是各种搜索资料，类库，各种尝试，甚至是没有用soap封装请求头就直接post请求数据，结果是请求回来的xml是错误，因此，第二天开始静下心来看网上的讲解，把自己的经历及请求过程记录如下：
主要参考如下两个资源（非常非常感谢）
http://www.cocoachina.com/bbs/read.php?tid-98388-page-1.html（自己封装独立类调用ASI方法实现）
http://blog.csdn.net/a6472953/article/details/9813799（最原始的经典实现方式）
我用第一种方法实现，关于参数注释第一篇基本都已说明，需要的参数只有如下：
#define P_SYSTEM_URL @"http://公网地址:端口/" // 不加*.asmx(*是指端口后.asmx前所有部分，这部分为第二个宏定义)
#define G_WS_TODOCENTER @"*.asmx" // (*是指端口后.asmx前所有部分)
#define G_WEBSERVICE_NAMESPACE @"http://tempuri.org/" // (如果没有指定命名空间，默认为http://tempuri.org/)
#define G_WS_TODOCENTER_GETWORKFLOWTODOCOUNT xxx // (请求的方法名)
//#define P_USER_NAME // 可以不设定，代码中相关注释即可
//#define P_PASSWORD // 可以不设定，代码中相关注释即可
//---------------------------------------对请求的理解------------------------------------------
//1、初始化SOAP消息体
NSString * soapMsgBody1 = [[NSString alloc] initWithFormat:
@"<?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>
"
"<%@ xmlns="%@">
", wsName, xmlNS];
NSString * soapMsgBody2 = [[NSString alloc] initWithFormat:
@"</%@>
"
"</soap:Body>
"
"</soap:Envelope>", wsName];
加粗部分为固定，需要改变的是wsName和xmlNS，wsName是webservice名即为上面定义的G_WS_TODOCENTER_GETWORKFLOWTODOCOUNT，xmlNS为命名空间即为上面定义的G_WEBSERVICE_NAMESPACE
//2、生成SOAP调用参数
NSString * soapParas = [[NSString alloc] init];
soapParas = @"";
if (![wsParas isEqual:nil]) {
int i = 0;
for (i = 0; i < [wsParas count]; i = i + 2) {
soapParas = [soapParas stringByAppendingFormat:@"<%@>%@</%@>
",
[wsParas objectAtIndex:i],
[wsParas objectAtIndex:i+1],
[wsParas objectAtIndex:i]];
}
}
//3、生成SOAP消息
NSString * soapMsg = [soapMsgBody1 stringByAppendingFormat:@"%@%@", soapParas, soapMsgBody2];
ASIHTTPRequest * theRequest = [ASIHTTPRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMsg length]];
//以下对请求信息添加属性前四句是必有的，第五句是soap信息。
[theRequest addRequestHeader:@"Content-Type" value:@"text/xml; charset=utf-8"];
[theRequest addRequestHeader:@"SOAPAction" value:[NSString stringWithFormat:@"%@%@", xmlNS, wsName]];
[theRequest addRequestHeader:@"Content-Length" value:msgLength];
[theRequest setRequestMethod:@"POST"];
[theRequest appendPostData:[soapMsg dataUsingEncoding:NSUTF8StringEncoding]];
[theRequest setDefaultResponseEncoding:NSUTF8StringEncoding];
return theRequest;
// -------------自己拼接-----------
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:Body>
"
"<GetMyRecord xmlns="http://tempuri.org/">
"
"<参数名1>参数1值</参数名1>
"
"<参数名2>参数2值</参数名2>
"
"</GetMyRecord>
"
"</soap:Body>
"
"</soap:Envelope>
"
];
NSURL *url = [NSURL URLWithString:@"请求连接（.asmx格式）"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];
//以下对请求信息添加属性前四句是必有的，第五句是soap信息。
[request addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[request addValue: @"命名空间/方法名（或叫webservice名称）" forHTTPHeaderField:@"SOAPAction"];
[request addValue: msgLength forHTTPHeaderField:@"Content-Length"];
[request setHTTPMethod:@"POST"];
[request setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
//请求
// NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
[self parserWithData:data]; // 自定义的parserWithData（XML解析方法）
}];