使用NSJSONSerialization解析JSON：错误3840 - 数据已损坏？ [英] Parsing JSON with NSJSONSerialization: Error 3840 - Data Corrupted?

问题描述

我在这个问题上阅读了很多Q / As，但找不到适合我情况的答案。

我从我在PHP中创建的REST服务检索JSON响应。这是我的代码：

  NSURLResponse * response = nil; 
 NSError * theError1 = nil; 
 NSError * theError2 = nil; 
 
 NSURL * webServiceUrl = [NSURL URLWithString：@http：// ...]; 
 NSURLRequest * request = [NSURLRequest requestWithURL：webServiceUrl cachePolicy：NSURLRequestReturnCacheDataElseLoad timeoutInterval：30]; 
 NSData * theData = [NSURLConnection sendSynchronousRequest：request returningResponse：& response error：& theError1]; 
 
 NSString * dataString = [[NSString alloc] initWithData：theData encoding：NSUTF8StringEncoding]; 
 NSLog（@％@，dataString）; 
 
 id json = [NSJSONSerialization JSONObjectWithData：theData options：NSJSONReadingAllowFragments | NSJSONReadingMutableContainers错误：& theError2]; 
 if（theError2！= nil）
 NSLog（@％@，theError2）; 
  

当我在浏览器中调用REST调用时，我看到以下响应， XCode日志：

  {
Name：REST Service，
Product： REST测试，
版本：1.0.0.0，
版权所有：2013测试公司
} 
  

但是，当我执行上面的代码时，会创建并记录以下错误：

错误Domain = NSCocoaErrorDomain Code = 3840无法读取数据，因为它已损坏。 （字符3周围的值无效。）UserInfo = 0x100547430 {NSDebugDescription =字符3周围的值无效。}

我做错了什么？

解决方案

确定，一如既往，检查实际数据，而不是字符串表示支付 - 感谢@Bavarious。 b
$ b

事实证明，负责创建JSON的PHP脚本都是UTF8 with BOM，所以PHP为每个涉及的脚本返回一个BOM。

一旦我将所有PHP文件更改为没有BOM的UTF8，一切似乎都很好 - 需要在MAC上进行测试。

对不起，中断，保持良好的工作。

（@ Bavarious：如果你想写一个答案，很高兴获得并接受它，因为你指出我的解决方案）。

---

现在可以解析JSON如预期。做一个精神笔记，总是仔细检查文本文件的编码。

I've read many Q/As on this problem but couldn't find an answer that fits my situation.

I retrieve a JSON response from a REST service I've created in PHP. This is my code:

NSURLResponse *response = nil;
NSError *theError1 = nil;
NSError *theError2 = nil;

NSURL *webServiceUrl = [NSURL URLWithString:@"http://..."];
NSURLRequest *request = [NSURLRequest requestWithURL:webServiceUrl cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30];
NSData *theData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&theError1];

NSString *dataString = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding];
NSLog(@"%@", dataString);

id json = [NSJSONSerialization JSONObjectWithData:theData options:NSJSONReadingAllowFragments | NSJSONReadingMutableContainers error:&theError2];
if (theError2 != nil)
    NSLog(@"%@", theError2);

When I invoke the REST call in the browser, I see the following response, which seems identical to what XCode logs:

{
  "Name": "REST Service",
  "Product": "REST Test",
  "Version": "1.0.0.0",
  "Copyright": "2013 Test Company"
}

When I execute above code, however, the following error is created and logged:

Error Domain=NSCocoaErrorDomain Code=3840 "The data couldn’t be read because it has been corrupted." (Invalid value around character 3.) UserInfo=0x100547430 {NSDebugDescription=Invalid value around character 3.}

What am I doing wrong?

解决方案

OK, as always, checking the actual data instead of the string representation pays - thanks @Bavarious.

It turns out that the PHP script(s) in charge of creating the JSON were all "UTF8 with BOM", so PHP returned a BOM for every script involved.

Once I changed all the PHP files to "UTF8 without BOM" everything seems to be fine - need to test this on the MAC though.

Sorry to interrupt, keep up the good work.

(@Bavarious: If you'd like to write an answer, I'd be happy to upvote and accept it, as you pointed me to the solution).

---

Was able to parse the JSON now as expected. Making a mental note to always double-check the text file encoding.

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