您好我正在编写iphone应用程序来传达Web服务,所以我有两个文本域,程序需要读取第一个文本字段的值并发布Web服务然后在Web服务响应之后需要编写第二个文本字段。但是在第二个文本字段中它并没有写任何东西。它在控制台上打印null。为什么会这样? 感谢。
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
nodeContent = [[NSMutableString alloc]init];
}
return self;
}
- (IBAction)login:(id)sender {
NSLog(@"PASSWORD text: %@",password.text);
if ([password.text length]==0) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"WebService" message:@"Supply Data in text field" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"ok",nil];
[alert show];
[alert release];
}
else {
NSString *soapFormat = [NSString 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"
"<CelsiusToFahrenheit xmlns=\"http://tempuri.org/\">\n"
"<Celsius>%@</Celsius>\n"
"</CelsiusToFahrenheit>\n"
"</soap:Body>\n"
"</soap:Envelope>\n",password.text];
NSLog(@"The request format is %@",soapFormat);
NSURL *locationOfWebService = [NSURL URLWithString:@"http://www.w3schools.com/webservices/tempconvert.asmx"];
NSLog(@"web url = %@",locationOfWebService);
NSMutableURLRequest *theRequest = [[NSMutableURLRequest alloc]initWithURL:locationOfWebService];
NSString *msgLength = [NSString stringWithFormat:@"%d",[soapFormat length]];
[theRequest addValue:@"text/xml" forHTTPHeaderField:@"Content-Type"];
[theRequest addValue:@"http://tempuri.org/CelsiusToFahrenheit" forHTTPHeaderField:@"SOAPAction"];
[theRequest addValue:msgLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPMethod:@"POST"];
//the below encoding is used to send data over the net
[theRequest setHTTPBody:[soapFormat dataUsingEncoding:NSUTF8StringEncoding]];
NSURLConnection *connect = [[NSURLConnection alloc]initWithRequest:theRequest delegate:self];
if (connect) {
webData = [[NSMutableData alloc]init];
startActivityIndicator;
}
else {
NSLog(@"No Connection established");
}
// [self performSegueWithIdentifier:@"logindevam" sender:self];
}
}
- (IBAction)sendkeyboard:(id)sender {
[sender resignFirstResponder];
}
-(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);
xmlParser = [[NSXMLParser alloc]initWithData:webData];
[xmlParser setDelegate: self];
//[xmlParser setShouldResolveExternalEntities: YES];
[xmlParser parse];
//
[connection release];
//[webData release];
//[resultTable reloadData];
stopActivityIndicator;
}
//xml delegates
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
[nodeContent appendString:[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if ([elementName isEqualToString:@"CelsiusToFahrenheitResult"]) {
NSLog(@"nodeContent: %@",nodeContent); // it becomes null
finaldata = nodeContent;
NSLog(@"finaldata: %@",finaldata); // it becomes null
NSLog(@"username.text: %@",username.text); // it becomes null
username.text = finaldata;
}
username.text = finaldata;
}
答案 0 :(得分:1)
代码::
-(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 = [theXML stringByReplacingOccurrencesOfString:@"<" withString:@"<"];
theXML = [theXML stringByReplacingOccurrencesOfString:@">" withString:@">"];
theXML = [theXML stringByReplacingOccurrencesOfString:@"&" withString:@"&"];
NSString *str, *result;
result = [[[NSString alloc] initWithFormat:@""] autorelease];
NSArray *array=[theXML componentsSeparatedByString:@"<CelsiusToFahrenheitResult>"];
for(int i=1;i<[array count];i++)
{
str=[array objectAtIndex:i];
NSRange ranfrom=[str rangeOfString:@"</CelsiusToFahrenheitResult>"];
result =[str substringToIndex:ranfrom.location];
}
NSLog(@"\n -> %@", result);
t2.text = result; // Your Second textfield
[connection release];
}
它肯定会起作用。 感谢。