爲什麼數組和字典的值在json解析中顯示爲空？

Question

嗨，我是新的iOS開發。在上面的代碼中，我調用了一個web服務，該服務的響應格式爲json。我想用該Web服務的響應來進行json解析。

這裏，爲什麼json和registartion的值在控制檯plz中顯示爲null幫助我。

這裏是我的WebSerVice.h文件

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

這裏我的網站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); 

}

Answer 1

可能在你的URL字符串inculding一些空白，你必須添加％ 20在白色空間。你只需要添加的代碼波紋管行： -

JsonString = [JsonString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 

你也被稱爲使用NSURLConnection你喜歡的方法波紋管： -

-(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]; 

}