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嗨，我是 iOS 开发的新手。在上面的代码中，我调用了一个 Web 服务，它的响应是 json 格式。我想用该 Web 服务的响应进行 json 解析。

在这里，为什么 json 和 registartion 的值在控制台中显示为 null 请帮助我。

这是我的 WebService.h 文件

@interface WebService : NSObject<NSURLConnectionDelegate ,NSURLConnectionDataDelegate> {
NSMutableData *data;
NSArray  * registrationDetail;
}
-(void)callWebService;
@end

这是我的网络 WebService.m 文件

@implementation WebService

-(void)callWebService {
NSString *JsonString =[ NSString stringWithFormat:@"http://bia.igreentechservices.com/ws/ws_registration.php?emailid=%@&password=%@&fname=%@&lname=%@&gender=%@&birthdate=%@&mobile=%@&address=%@&emergency_contact_no=%@&other_contact_no_1=%@&other_contact_no_2=%@",emailAdd,pwd,fName,lName,gen,bDate,mobileNum,add,emergencyContactNum,anotherContactNum1,anothercontactNum2]


   UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
   NSURL *url = [NSURL URLWithString:JsonString];
   NSURLRequest *request =[NSURLRequest  requestWithURL:url];
   NSURLConnection *myConnection =[[NSURLConnection alloc] initWithRequest:request delegate:self];
   [myConnection start];
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {


 data= [[NSMutableData alloc] init];
}


-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData {
[data appendData:theData];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSString *responseString = [[NSString alloc]
    initWithData:data encoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
registrationDetail = [json objectForKey:@"registration"];
NSLog(@"%@",json);
NSLog(@"%@",registrationDetail);
NSLog(@"%@",responseString);
NSLog(@"%@",data);

}

4

1 回答 1

2

可能在您的 URL 字符串中包含一些空格，您必须在空格中添加 %20。您只需添加以下代码行：-

JsonString = [JsonString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

您还使用NSURLConnection如下方式调用了您的方法：-

-(void)callWebService {
NSString *JsonString =[ NSString stringWithFormat:@"http://bia.igreentechservices.com/ws/ws_registration.php?emailid=%@&password=%@&fname=%@&lname=%@&gender=%@&birthdate=%@&mobile=%@&address=%@&emergency_contact_no=%@&other_contact_no_1=%@&other_contact_no_2=%@",emailAdd,pwd,fName,lName,gen,bDate,mobileNum,add,emergencyContactNum,anotherContactNum1,anothercontactNum2]


   UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
   NSURL *url = [NSURL URLWithString:JsonString];
   NSURLRequest *request =[NSURLRequest  requestWithURL:url];
   NSURLConnection *myConnection =[[NSURLConnection alloc] initWithRequest:request delegate:self];

    if(myConnection)
        {
            data=[[NSMutableData alloc]init]; 
        }
        else
        {
            NSLog(@"connection not complet")
        }

}


-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

    [data setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [data appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    NSLog(@"Error is %@",error);
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {

    NSString *responseString = [[NSString alloc] initWithData:self.webData encoding:NSUTF8StringEncoding];

    data = nil;
    [connection release];
    [data release];

}
于 2013-03-08T05:38:20.770 回答