从目标C调用.Net Web服务

Question

如何从Objective C iPhone应用程序调用.net Web服务？

Answer 1

此在线服务将带您.NET WSDL并创建Objective-C存根，供您在iPhone应用程序中使用。

http://sudzc.com/

Answer 2

（请纠正您的Xcode编码的情况下） 下面是代码，你将可以在任何你的函数来实现说-(void) viewDidLoad{}

1. 首先，你需要调用web服务，然后它的几个代表
2. 其次，当你收到数据时，你必须解析它，因为数据来自XML正式，所以使用XML解析（NSXMLparser）。
3. 一旦你有数据，你可以显示它或任何你想要的。

下面是示例代码从Web服务HELLO WORLD字符串返回：

- (void)viewDidload 
{ 
    NSMutableString *soapMessage = [NSMutableString stringWithFormat:@"<?xml version=\"1.0\"encoding=\"utf-8\"?>\n" 
     "<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/\">\n" 
     "<soap:Body>\n" 
     "<HelloWorld xmlns=\"http://Helloworldservice.org/\" />\n" 
     "</soap:Body>\n" 
     "</soap:Envelope>"]; 

    //You can get soap Message from web service simply when you run it it shows the request message and response message in XML format copy request message then paste it in XCODE. (Notice please check for escape sequence that is \") 

    // The URL of the your web service 
    NSURL *url = [NSURL URLWithString:@"http://Helloworldservice/service.asmx"]; 

    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://HelloWorld.org/HelloWorld" forHTTPHeaderField:@"Soapaction"]; 

    [theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"]; 
    [theRequest setHTTPMethod:@"POST"];  
    [theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]]; 

    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; 

    if (theConnection) //Means if the connection is active 
    { 
    } 
    else 
    { 
     NSLog(@"theConnection is NULL"); 
    } 
} 

//NOW You have to implement some of delegates required for connection 

//Recieve data defined when your connection do recieve some data from .NET web service. 

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 
    NSString* strin=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]; 
    //Now as we get data in XML format time to parse the data into some meaningful form use NSXMLPARSER. 
    NSXMLParser *parser=[[NSXMLParser alloc]initWithData:data]; 

    //Delegate should be defined as now make it self it will probably give a warning message so execute it no problem but if u want this warning to be removed just ass delegate in .h file like @interface Web_Service_testViewController : UIViewController<NSXMLParserDelegate> {} 

    [parser setDelegate:self]; 
    //here actual parsing is done. 
    [parser parse]; 
    //Now time to release parse object from memory. 
    [parser release]; 
} 

//If connection fails just in case OK. 
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{} 

    //Called when connection has finished. Mostly we place the data in this delegate we require to be called after web service i hope it is understandable to u :-) 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    [connection release]; 
} 

//Now we have to implement some of the delegates of NSXMLPARSER Quite simple 

//For a file reading. 
- (void)parserDidStartDocument:(NSXMLParser *)parser{ 
} 

//When parsing is started on the element obtained from web service for the moment leave it blank. 
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict 
{ 
} 

//When parsing is finished. 
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{ 
} 

//This is the main delegate that can return a string format result. 
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)astring 
{ 
    //Say you have a NSString object named as "mymessage" 
    mymessage=string; 
    //this "astring" is that string which is returned from delegate 
} 

//Your web service is finished it is totally implemented code no errors :-). Quite easy isn't it?