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PONSURLConnection - Is it possible to wait/block on a request?
 

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  1. PONSURLConnection - Is it possible to wait/block on a request?
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    <p>I need to wait for a response from a SOAP webservice, I am calling via a NSURLConnection as I need to manipulate the data being returned and then return it from my class to the calling class..</p> <p>Here is my code:</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @interface UsersBLL : NSObject { NSMutableData *webData; NSMutableString *soapResults; NSXMLParser *xmlParser; BOOL *recordResults; NSNumber *EmailCount; } @property(nonatomic, retain) NSMutableData *webData; @property(nonatomic, retain) NSMutableString *soapResults; @property(nonatomic, retain) NSXMLParser *xmlParser; -(int)checkEmailAddress:(NSString*)emailAddress; @end #import "UsersBLL.h" @implementation UsersBLL @synthesize webData; @synthesize soapResults; @synthesize xmlParser; -(id)init { self = [super init]; return self; } -(int)checkEmailAddress:(NSString*)emailAddress { // Build the SOAP envelope NSString *soapMessage = [NSString stringWithFormat: @"&lt;?xml version=\"1.0\" encoding=\"utf-8\"?&gt;\n" "&lt;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/\"&gt;\n" "&lt;soap:Body&gt;\n" "&lt;CheckEmailAddress xmlns=\"http://tempuri.org/\"&gt;\n" "&lt;EmailAddress&gt;%@&lt;/EmailAddress&gt;\n" "&lt;/CheckEmailAddress&gt;\n" "&lt;/soap:Body&gt;\n" "&lt;/soap:Envelope&gt;\n", emailAddress]; NSLog(soapMessage); NSURL *url = [NSURL URLWithString:@"http://photoswapper.mick-walker.co.uk/UsersService.asmx?op=CheckEmailAddress"]; 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/CheckEmailAddress" 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 ) { webData = [[NSMutableData data] retain]; } else { NSLog(@"theConnection is NULL"); } NSLog(@"%@", EmailCount); } -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [webData setLength: 0]; } -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [webData appendData:data]; } -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { NSLog(@"ERROR with theConenction"); [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(theXML); [theXML release]; if( xmlParser ) { [xmlParser release]; } xmlParser = [[NSXMLParser alloc] initWithData: webData]; [xmlParser setDelegate: self]; [xmlParser setShouldResolveExternalEntities: YES]; [xmlParser parse]; [connection release]; [webData release]; } -(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qName attributes: (NSDictionary *)attributeDict { if( [elementName isEqualToString:@"CheckEmailAddressResult"]) { if(!soapResults) { soapResults = [[NSMutableString alloc] init]; } recordResults = TRUE; } } -(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { if( recordResults ) { [soapResults appendString: string]; } } -(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if( [elementName isEqualToString:@"CheckEmailAddressResult"]) { recordResults = FALSE; NSNumberFormatter *formatter = [[NSNumberFormatter alloc]init]; EmailCount = [formatter numberFromString:soapResults]; [formatter release]; [soapResults release]; soapResults = nil; } } @end </code></pre> <p>CheckEmailAddress is declared as returning an integer value (I know it returns nothing in the sample above). </p> <p>What I ideally want, is through the CheckEmailAddress method, return the value retrieved from the web service. However as the call NSURLConnection does not wait until the request has completed, I cannot do it.</p> <p>I would be grateful if anyone could give me any potential ideas for workarounds.</p>
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