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如果存在特殊字符，NSString转换失败NSMutableData

2010-11-29 77 views
2

我正在编写一个应用程序，通过http服务器接口与DirecTV接收器进行交互。我能够查询设备并获得SJON格式的响应。如果存在特殊字符，NSString转换失败NSMutableData

这里是我的示例代码：

- (NSDictionary *) readDVRData 
{ 
    NSMutableData *rData = [[NSMutableData alloc] initWithContentsOfFile:@"./data"]; 
    //NSLog(@"rData = %@",rData); 
    NSString *rString = [[NSString alloc] initWithData:rData encoding:NSUTF8StringEncoding]; 
    NSLog(@"rString = %@",rString); 
    NSError *error; 
    SBJSON *json = [[SBJSON new] autorelease]; 
    NSDictionary *response = [json objectWithString:rString error:&error]; 
    //NSLog(@"response = %@",response); 
    return response;  
}

出于测试目的，我保存到数据文件的响应，我从它在上面的例子中读书。从NSMutableData到NSString的转换通过：

NSString *rString = [[NSString alloc] initWithData:rData encoding:NSUTF8StringEncoding];

如果存在以下字符，则会失败。 È如CrÈmeFraiche。作为参考，这是在南方公园录音的情节标题和描述。

如果我将此字符更改为大写字母“E”，则转换工作。我应该用不同的方法来捕捉这样的事情吗？还是有一种简单的方法来删除这样的字符？请记住，我不会事先知道它是否是重音标记或可能导致转换失败的不同内容。

谢谢， 戴夫

片段的数据文件，如果是需要。我会包含整个文本，但会将字符数限制推到30000以上。

{ 
     "groupId": "1 1 381C3", 
     "groupTitle": "South Park", 
     "isRecording": false, 
     "numItems": 10, 
     "numNewItems": 10, 
     "programs": [ 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 198", 
      "description": "\"CrÈme Fraiche\" Animation, Comedy. (2010) Trey Parker, Matt Stone. Randy's obsession with the Food Network forces Sharon to explore a new interest of her own. Series.", 
      "duration": 1800, 
      "episodeTitle": "CrÈme Fraiche", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6937756", 
      "rating": "TV-MA-L", 
      "startTime": 1290056400, 
      "title": "South Park", 
      "uniqueId": "5397375192530140068" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 197", 
      "description": "\"Coon vs. Coon & Friends\" Animation, Comedy. (2010) Trey Parker, Matt Stone. Coon and Friends find themselves at the mercy of Cartman who now has the dark lord doing his bidding; Kenny wrestles with the curse of his super power. Series.", 
      "duration": 1800, 
      "episodeTitle": "Coon vs. Coon & Friends", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6918387", 
      "rating": "TV-MA-L", 
      "startTime": 1289444400, 
      "title": "South Park", 
      "uniqueId": "8476957599452610419" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 196", 
      "description": "\"Mysterion Rises\" Animation, Comedy. (2010) Trey Parker, Matt Stone. Mysterion's true identity is revealed; scorned by fellow superheroes, one goes out for revenge. Series.", 
      "duration": 1800, 
      "episodeTitle": "Mysterion Rises", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6896823", 
      "rating": "TV-MA-L", 
      "startTime": 1288843200, 
      "title": "South Park", 
      "uniqueId": "2113731123121326471" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 0", 
      "description": "Animation, Comedy. Trey Parker, Matt Stone. The adventures of four boys who live in South Park, Colo. Series.", 
      "duration": 1800, 
      "episodeTitle": "", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6830127", 
      "rating": "TV-MA-L", 
      "startTime": 1288751400, 
      "title": "South Park", 
      "uniqueId": "2166056034991125062" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 195", 
      "description": "\"Coon 2: Hindsight\" Animation, Comedy. (2010) Trey Parker, Matt Stone. Coon and friends set out to help the victims of BP's latest catastrophic drilling accident in the Gulf. Series.", 
      "duration": 1800, 
      "episodeTitle": "Coon 2: Hindsight", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6876407", 
      "rating": "TV-MA-L", 
      "startTime": 1288238400, 
      "title": "South Park", 
      "uniqueId": "8615834721021879366" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 194", 
      "description": "\"Insheeption\" Animation, Comedy. (2010) Trey Parker, Matt Stone. When Stan is sent to the school counselor because he's holding on to an obscene number of useless possessions, he realizes that Mr. Mackey had a hoarding disorder too. Series.", 
      "duration": 1783, 
      "episodeTitle": "Insheeption", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6857628", 
      "rating": "TV-MA-L", 
      "startTime": 1287626416, 
      "title": "South Park", 
      "uniqueId": "1547798106243799673" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 193", 
      "description": "\"It's a Jersey Thing\" Animation, Comedy. (2010) Trey Parker, Matt Stone. New Jersey is taking over the nation one state at a time, Randy and the boys take a stand as the Jerseyites approach South Park. Series.", 
      "duration": 1800, 
      "episodeTitle": "It's a Jersey Thing", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6839243", 
      "rating": "TV-MA-L", 
      "startTime": 1287028800, 
      "title": "South Park", 
      "uniqueId": "8123622337314668826" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 193", 
      "description": "\"It's a Jersey Thing\" Animation, Comedy. (2010) Trey Parker, Matt Stone. New Jersey is taking over the nation one state at a time, Randy and the boys take a stand as the Jerseyites approach South Park. Series.", 
      "duration": 1784, 
      "episodeTitle": "It's a Jersey Thing", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6839243", 
      "rating": "TV-MA-L", 
      "startTime": 1287021615, 
      "title": "South Park", 
      "uniqueId": "949183344652655207" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 0", 
      "description": "Animation, Comedy. Trey Parker, Matt Stone. The adventures of four boys who live in South Park, Colo. Series.", 
      "duration": 1800, 
      "episodeTitle": "", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6830127", 
      "rating": "TV-MA-L", 
      "startTime": 1286937000, 
      "title": "South Park", 
      "uniqueId": "7841891672059226043" 
     }, 
     { 
      "callsign": "COMHD", 
      "contentId": "1 1 381C3 0", 
      "description": "Animation, Comedy. Trey Parker, Matt Stone. The adventures of four boys who live in South Park, Colo. Series.", 
      "duration": 1800, 
      "episodeTitle": "", 
      "expiration": "0", 
      "isHd": true, 
      "isPartial": false, 
      "isPpv": false, 
      "isRecording": false, 
      "isViewed": false, 
      "isVod": false, 
      "keepUntilFull": true, 
      "major": 249, 
      "minor": 65535, 
      "programId": "6830127", 
      "rating": "TV-MA-L", 
      "startTime": 1286856000, 
      "title": "South Park", 
      "uniqueId": "3872435936942587460" 
     } 
     ] 
    }

来源

2010-11-29 Dave

回答

2

您是否尝试过其他编码，如NSISOLatin1StringEncoding？

来源

2010-11-29 20:00:52 jarmod

+0

这工作。谢谢。 – Dave 2010-11-30 03:39:57

+0

@Dave，如果它有效，你应该接受它作为正确的答案。 – benzado 2010-11-30 06:36:55

+0

@benzado，抱歉不知道该怎么做。希望点击复选标记接受它作为正确的答案 – Dave 2010-11-30 15:48:19

1

这很可能是Web服务器的编码问题。你在期待UTF-8的数据，但我敢打赌，这不是他们寄给你的。尝试阅读使用[NSString stringWithContentsOfFile：]来看看是否有任何改变。

编译器会抛出警告，因为该方法已被弃用。实际上，你可以使用stringWithContentsOfFile：usedEncoding：error：取而代之，但我和其他人报告说，它似乎不像旧方法那样工作的数据没有完全编码（即，90％的网络:-)）。

来源

2010-11-29 20:16:03

0

检查DirecTV设备响应中的HTTP标头。它可能不使用UTF-8。找出它正在使用的编码，然后向initWithData:encoding:提供正确的常量。

您可以使用命令curl -i http://directv-data-url来查看HTTP标头。

来源

2010-11-29 20:31:57 benzado

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