查询QQ是否在线(SOAP)
今天作了个查询QQ是否在线的，效果图以下，web
http://webservice.webxml.com.cn/webservices/qqOnlineWebService.asmx
网络
得到腾讯QQ在线状态
输入参数：QQ号码 String，默认QQ号码：8698053。返回数据：String，Y = 在线；N = 离线；E = QQ号码错误；A = 商业用户验证失败；V = 免费用户超过数量app
查询结果没有设置为在线等，仍是Y，这个用switch就能够了，或者写一个专门的类用来反馈结果 
在xib中设置如上图，textfiled的键盘设置为数字键盘网站
声明文件内容
atom
#import <UIKit/UIKit.h>url
@interface YUViewController : UIViewController<NSXMLParserDelegate,NSURLConnectionDelegate>//前者用来解析XML，后者用于网络链接spa
@property (weak, nonatomic) IBOutlet UITextField *qq;.net
- (IBAction)doQuery:(id)sender;orm
@property (strong, nonatomic) NSMutableData *webData;xml
@property (strong, nonatomic) NSMutableString *soapResults;
@property (strong, nonatomic) NSXMLParser *xmlParser;
@property (nonatomic) BOOL elementFound;
@property (strong, nonatomic) NSString *matchingElement;
@property (strong, nonatomic) NSURLConnection *conn;
@end
//SOAP是简单对象访问协议，它可当作是HTTP与XML的结合，其中XML部分是做为HTTP报文的实体主体部分。具体信息能够参考百度
//在iOS中使用SOAP，须要咱们本身组装XML格式的字符串，当XML字符串比较长的时候会变得很麻烦。另外，咱们在写XML格式的字符串时也要常常使用转义字符“\”。这个是服务提供方 www.webxml.com.cn
实现文件内容
//
// YUViewController.m
// atQQ
//
// Created by chen on 3/9/13.
// Copyright (c) 2013 IOSCHEN. All rights reserved.
//
#import "YUViewController.h"
@interface YUViewController ()
@end
@implementation YUViewController
@synthesize webData;
@synthesize soapResults;
@synthesize xmlParser;
@synthesize elementFound;
@synthesize matchingElement;
@synthesize conn;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
// 开始查询
- (IBAction)doQuery:(id)sender
{
NSString *number =_qq.text;
// 设置咱们以后解析XML时用的关键字，与响应报文中Body标签之间的qqCheckOnlineResult标签对应
matchingElement = @"qqCheckOnlineResult";
// 建立SOAP消息，内容格式就是网站上提示的请求报文的实体主体部分
NSString *soapMsg = [NSString stringWithFormat:
@"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<soap12:Envelope "
"xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
"xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" "
"xmlns:soap12=\"http://www.w3.org/2003/05/soap-envelope\"> "
"<soap12:Body>"
"<qqCheckOnline xmlns=\"http://WebXml.com.cn/\">"
"<qqCode>%@</qqCode>"
"</qqCheckOnline>"
"</soap12:Body>"
"</soap12:Envelope>", number];
// 将这个XML字符串打印出来
NSLog(@"%@", soapMsg);
// 建立URL，内容是前面的请求报文报文中第二行主机地址加上第一行URL字段
NSURL *url = [NSURL URLWithString: @"http://webservice.webxml.com.cn/webservices/qqOnlineWebService.asmx"];
// 根据上面的URL建立一个请求
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMsg length]];
// 添加请求的详细信息，与请求报文前半部分的各字段对应
[req addValue:@"application/soap+xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[req addValue:msgLength forHTTPHeaderField:@"Content-Length"];
// 设置请求行方法为POST，与请求报文第一行对应
[req setHTTPMethod:@"POST"];
// 将SOAP消息加到请求中
[req setHTTPBody: [soapMsg dataUsingEncoding:NSUTF8StringEncoding]];
// 建立链接
conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];
if (conn) {
webData = [NSMutableData data];
}
[_qq resignFirstResponder];
}
#pragma mark -
#pragma mark URL Connection Data Delegate Methods
// 刚开始接受响应时调用
-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *) response{
[webData setLength: 0];
}
// 每接收到一部分数据就追加到webData中
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *) data {
[webData appendData:data];
}
// 出现错误时
-(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *) error {
conn = nil;
webData = nil;
}
// 完成接收数据时调用
-(void) connectionDidFinishLoading:(NSURLConnection *) connection {
NSString *theXML = [[NSString alloc] initWithBytes:[webData mutableBytes]
length:[webData length]
encoding:NSUTF8StringEncoding];
// 打印出获得的XML
NSLog(@"%@", theXML);
// 使用NSXMLParser解析出咱们想要的结果
xmlParser = [[NSXMLParser alloc] initWithData: webData];
[xmlParser setDelegate: self];
[xmlParser setShouldResolveExternalEntities: YES];
[xmlParser parse];
}
#pragma mark -
#pragma mark XML Parser Delegate Methods
// 开始解析一个元素名
-(void) parser:(NSXMLParser *) parser didStartElement:(NSString *) elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *) qName attributes:(NSDictionary *) attributeDict {
if ([elementName isEqualToString:matchingElement]) {
if (!soapResults) {
soapResults = [[NSMutableString alloc] init];
}
elementFound = YES;
}
}
// 追加找到的元素值，一个元素值可能要分几回追加
-(void)parser:(NSXMLParser *) parser foundCharacters:(NSString *)string {
if (elementFound) {
[soapResults appendString: string];
}
}
// 结束解析这个元素名
-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:matchingElement]) {
UIAlertView *alert= [[UIAlertView alloc] initWithTitle:@"QQ是否在线"
message:[NSString stringWithFormat:@"%@", soapResults]
delegate:self
cancelButtonTitle:@"肯定"
otherButtonTitles:nil];
[alert show];
elementFound = FALSE;
// 强制放弃解析
[xmlParser abortParsing];
soapResults=nil;//防止查询两次的时候显示了两次的结果
}
}
// 解析整个文件结束后
- (void)parserDidEndDocument:(NSXMLParser *)parser {
if (soapResults) {
soapResults = nil;
}
}
// 出错时，例如强制结束解析
- (void) parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
if (soapResults) {
soapResults = nil;
}
}
@end
参考博文 http://my.oschina.net/plumsoft/blog/75277