非轉義控制字符的間歇性JSON解析器失敗

在某個文本中搜索twitter的iPhone應用程序中的功能。代碼非常簡單，我將url字符串傳遞給twitter api，然後解析結果。儘管JSON解析器的一半時間失敗，並且未轉義的控制字符'0x0'出現錯誤。下面的代碼和完整的錯誤信息。非轉義控制字符的間歇性JSON解析器失敗

- (void)grabData:(NSString *)searchTerm { 
    NSString *urlString = [NSString stringWithFormat:@"http://search.twitter.com/search.json?q=%@&rpp=25",searchTerm]; 

    NSURL *url = [NSURL URLWithString:urlString]; 

    NSLog(@"Created url:%@",url); 

    //Setup and start async download 
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url]; 
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; 
    [connection release]; 
    [request release]; 
    } 

    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 

    // Store incoming data into a string 
    NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 

    //NSLog(@"Did receive some data %@",jsonString); 

    //Create a dictionary from the JSON string 
    NSDictionary *results = [jsonString JSONValue]; 

    // Build an Array from the dictionary for easy access to each entry 
    NSDictionary *tweets = [results objectForKey:@"results"]; 

      // Loop through each entry in the dictionary 
    for(NSDictionary *tweet in tweets) { 
    // Get the user string for the tweet 
    NSString *tUser = [tweet objectForKey:@"from_user"]; 
      NSLog(@"Tweet from %@",tUser); 
      } 

    }

錯誤來自控制檯的信息，50％的時間，其他50％的信息按預期工作。

2010-12-20 21:22:02.022 TwitterSearch[47362:207] Created url:http://search.twitter.com/search.json?q=red&rpp=25 
2010-12-20 21:22:02.361 TwitterSearch[47362:207] -JSONValue failed. Error trace is: (
    "Error Domain=org.brautaset.JSON.ErrorDomain Code=5 \"Unescaped control character '0x0'\" UserInfo=0x4d6a130 {NSLocalizedDescription=Unescaped control character '0x0'}", 
    "Error Domain=org.brautaset.JSON.ErrorDomain Code=3 \"Object value expected for key: profile_image_url\" UserInfo=0x4d6a200 {NSUnderlyingError=0x4d6a170 \"Unescaped control character '0x0'\", NSLocalizedDescription=Object value expected for key: profile_image_url}", 
    "Error Domain=org.brautaset.JSON.ErrorDomain Code=3 \"Expected value while parsing array\" UserInfo=0x4d6a240 {NSUnderlyingError=0x4d6a1e0 \"Object value expected for key: profile_image_url\", NSLocalizedDescription=Expected value while parsing array}", 
    "Error Domain=org.brautaset.JSON.ErrorDomain Code=3 \"Object value expected for key: results\" UserInfo=0x4d6a310 {NSUnderlyingError=0x4d6a2d0 \"Expected value while parsing array\", NSLocalizedDescription=Object value expected for key: results}" 
)

來源

2010-12-21 adam0101

當它失敗時，JSON的外觀如何？ – 2010-12-21 02:40:43

didReceiveData方法在傳遞數據時可以多次調用。因此，在該方法中，您應該簡單地將每個傳入塊添加到NSMutableData類變量（不處理它）。

完整數據的處理應在connectionDidFinishLoading方法中完成。

該錯誤可能是因爲它試圖解析部分數據塊而發生的。

來源

2010-12-21 02:49:25 Anna

@蒙迪，感謝您的糾正。 – Anna 2011-05-12 21:36:02

非轉義控制字符的間歇性JSON解析器失敗

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