JSONparsing在iPhone SDK
我有一个特定的JSON：
[ { "id" : 42422422, "created" : 1329684013, "name" : "Test" }, { "id" : 42422423, "created" : 1329684015, "name" : "Test 123" }, { ... } ] parsing这个确定，但是当networking服务器发生错误时，返回这个JSON：
{ "error" : { "code" : "511", "message" : "JSON error", "extra" : { "some" : "text", "someextra" : "text" } } }
我试过使用这个：
if ([jsonArray valueForKey:@"error"] != nil) {
但是这是行不通的，因为如果我输出的值是'null'
我怎样才能检查这个？ （我知道我可以使用NSRange ，但是我认为必须有更好的方法吗？
我parsing这样的JSON：
NSDictionary *jsonArray = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error: &e];
responseData来自NSURLConnection的connectionDidFinishLoading方法。
你应该先检查你的结果是一个数组还是字典。
if ([jsonArray isKindOfClass:[NSArray class]]) { //process results } else if ([jsonArray isKindOfClass:[NSDictionary class]]) { NSDictionary *errorInfo = [(NSDictionary *)jsonArray objectForKey:@"error"]; //handle error... }
检查下面的链接，并简单地parsingJson。
获取Nextbelt的演示
下载JSON框架
检查此链接的JSONparsing
NSString *appurl =[NSString stringWithFormat:@"your link"]; appurl = [appurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:appurl]]; NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse: nil error: nil ]; NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding]; NSMutableDictionary *deletdict=[returnString JSONValue]; if([[deletdict objectForKey:@"success"] isEqualToString:@"False"]) { NSLog(@"Unsuccess..."); } else { NSLog(@"success..."); }
和Post方法是这样的
NSString *post =[NSString stringWithFormat:@"AgencyId=STM&UserId=1&Type=1&Date=%@&Time=%@&Coords=%@&Image=h32979`7~U@)01123737373773&SeverityLevel=2",strDateLocal,strDateTime,dict]; NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]]; NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; [request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://google/places"]]]; [request setHTTPMethod:@"POST"]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody:postData]; NSError *error; NSURLResponse *response; NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; NSString *str=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding]; NSMutableArray *SubLiveArray=[str JSONValue];
这是所有types的演示链接
有了您的无错误的JSON负载，您有一个顶级的数组（由开头[注意到]），而您的错误JSON负载则不。
{ "error" : { "code" : "511", "message" : "JSON error", "extra" : { "some" : "text", "someextra" : "text" } } }
错误代码是一个嵌套的字典对象，因此您可以使用以下来parsing它：
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error]; NSString *errorCode = [NSString stringWithFormat:@"%@",[(NSDictionary*)[json objectForKey:@"error"]objectForKey:@"code"]];
-(void)SerchpageApicall { NSString *main_url=@"yourlink"; NSString *appurl=[NSString stringWithFormat:@"%@&address=%@",main_url,_txt_Search_address.text]; appurl = [appurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSURL *url=[NSURL URLWithString:appurl]; NSURLRequest* requestVersion = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:5.0]; NSHTTPURLResponse* response = nil; NSError* error = nil; NSData *returnData = [NSURLConnection sendSynchronousRequest:requestVersion returningResponse:&response error:&error ]; NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding]; NSMutableDictionary *dict=[returnString JSONValue]; }
使用[jsonArray objectForKey:@"error"]而不是valueForKey