定义kDefaultErrorCode 12345

Question

我正在尝试解析位于以下位置的api请求的json字符串： http://www.physics.leidenuniv.nl/json/news.php

但是，我在解析这个json时遇到了麻烦。我收到以下错误： Unexpected end of file during string parse

我已经找了几个小时，但我找不到这个问题的答案。

我的代码段：

在我的viewDidLoad中：

NSURLRequest *request = [NSURLRequest requestWithURL:
                         [NSURL URLWithString:@"http://www.physics.leidenuniv.nl/json/news.php"]];

[[NSURLConnection alloc] initWithRequest:request delegate:self];

代表：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSMutableData *responseData = [[NSMutableData alloc] init];
[responseData appendData:data];

NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSError *e = nil;
NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:jsonData options: NSJSONReadingMutableContainers error: &e];
}

有人知道这个问题的答案，所以我可以解析json数据吗？

Answer 1

我建议这样做：

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.physics.leidenuniv.nl/json/news.php"]];

__block NSDictionary *json;
[NSURLConnection sendAsynchronousRequest:request
                                   queue:[NSOperationQueue mainQueue]
                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
                           json = [NSJSONSerialization JSONObjectWithData:data
                                                                  options:0
                                                                    error:nil];
                           NSLog(@"Async JSON: %@", json);
                       }];

或者，无论出于何种原因（不推荐），您都希望运行同步请求：

NSData *theData = [NSURLConnection sendSynchronousRequest:request
                      returningResponse:nil
                                  error:nil];

NSDictionary *newJSON = [NSJSONSerialization JSONObjectWithData:theData
                                                        options:0
                                                          error:nil];

NSLog(@"Sync JSON: %@", newJSON);

Answer 2

这样做：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // Append the new data to receivedData.
    // receivedData is an instance variable declared elsewhere.

    [responseData appendData:data];
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSError *e = nil;
NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:jsonData options: NSJSONReadingMutableContainers error: &e];

}

Answer 3

//call this method
-(void)syncWebByGETMethod
{
      [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
    NSString *urlString = [NSString stringWithFormat:@"http://www.yoursite.com"];
    NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
   [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]                          completionHandler:^(NSURLResponse * response, NSData * data, NSError * connectionError)
        {
         if (data)
         {
             id myJSON;
             @try {
                 myJSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
             }
             @catch (NSException *exception) {
             }
             @finally {
             }
             jsonArray = (NSArray *)myJSON;

             NSLog(@"mmm %@",jsonArray);
         }
     }];
}

Answer 4

将json-url数据存储在字典中的简单方法。

 NSData *data=[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://query.yahooapis.com/v1/public/yql?q=select+%2A+from+weather.forecast+where+woeid%3D1100661&format=json"]];
    NSError *error=nil;
    id response=[NSJSONSerialization JSONObjectWithData:data options:
                 NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves error:&error];

    if (error) {
        NSLog(@"%@",[error localizedDescription]);
    } else {
        _query = [response objectForKey:@"query"];
        NSLog(@"%@",_query);

你可以试试这个，这很容易。

Answer 5

一种解决方案是使用NSURLConnection sendSynchronousRequest:returningResponse:error:（docs）。在完成处理程序中，您将获得所有响应数据，而不仅仅是您在委托的connection:didReceiveData:方法中获得的部分数据。

如果您想继续使用该代表，则需要遵循Apple docs中的建议：

委托应该连接每个数据对象的内容交付以构建URL加载的完整数据。

Answer 6

Volunteermatch API Objective C

我正在使用一种常用的AFNetworking WS Calling方法。用途：

致电WS：

NSDictionary* param = @{
                        @"action":@"helloWorld",
                        @"query":@"{\"name\":\"john\"}"
                        };

[self requestWithUrlString:@"URL" parmeters:paramDictionary success:^(NSDictionary *response) {
    //code For Success
} failure:^(NSError *error) {
   // code for WS Responce failure
}];

添加两种方法：这两种方法很常见，你可以在使用NSObject类的整个项目中使用这些常用方法。还添加 //定义错误代码，如...

定义kDefaultErrorCode 12345

- (void)requestWithUrlString:(NSString *)stUrl parmeters:(NSDictionary *)parameters success:(void (^)(NSDictionary *response))success failure:(void (^)(NSError *error))failure {

[self requestWithUrl:stUrl parmeters:parameters success:^(NSDictionary *response) {
    if([[response objectForKey:@"success"] boolValue]) {
        if(success) {
            success(response);

        }
    }
    else {
        NSError *error = [NSError errorWithDomain:@"Error" code:kDefaultErrorCode userInfo:@{NSLocalizedDescriptionKey:[response objectForKey:@"message"]}];
        if(failure) {
            failure(error);
        }
    }
} failure:^(NSError *error) {
    if(failure) {
        failure(error);
    }
}];}

和 //在下面的方法中设置标题（如果需要，否则删除）

- (void)requestWithUrl:(NSString *)stUrl parmeters:(NSDictionary *)parameters success:(void (^)(NSDictionary *response))success failure:(void (^)(NSError *))failure {

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager setResponseSerializer:[AFHTTPResponseSerializer serializer]];


[manager.requestSerializer setValue:@"WWSE profile=\"UsernameToken\"" forHTTPHeaderField:@"Authorization"];



[manager GET:stUrl parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
    if([responseObject isKindOfClass:[NSDictionary class]]) {
        if(success) {
            success(responseObject);
        }
    }
    else {
        NSDictionary *response = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:nil];
        if(success) {
            success(response);
        }
    }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
    if(failure) {
        failure(error);
    }
}];}

对于任何问题及更多细节please visit..AFNetworking

Answer 7

-(void)getWebServic{
NSURL *url = [NSURL URLWithString:@"----URL----"];

// 2
NSURLSessionDataTask *downloadTask = [[NSURLSession sharedSession]
                                      dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
    NSDictionary *jsonObject=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
    [self loadDataFromDictionary:(NSArray*)jsonObject];
    NSLog(@"data: %@",jsonObject);

}];

// 3
[downloadTask resume]; }

objective c从url请求解析json

7 个答案:

定义kDefaultErrorCode 12345