来自 NSXMLParser 的奇怪符号

Question

我遇到了一个问题；我尝试使用 NSXMLParser 解析的所有内容都以“†Êá”（元素名称，elementText ...）结束

我尝试了不同的来源（我想从我的服务器解析的来源，简单的NSString，以及来自网络的不同来源，它们提供 XML）并且每次都是“†Êá”。

//prepar request
//NSString *urlString = [NSString   stringWithFormat:@"http://192.168.1.102:8080/support/supportService"];
NSString *urlString = [NSString stringWithFormat:@"http://sites.google.com/site/iphonesdktutorials/xml/Books.xml"];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

//get response
NSHTTPURLResponse* urlResponse = nil;  
NSError *error = [[NSError alloc] init];  
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];  
NSString *result = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding];
NSLog(@"Response Code: %d", [urlResponse statusCode]);
//if ([urlResponse statusCode] >= 200 && [urlResponse statusCode] < 300) {
 NSLog(@"Response: %@", result);
 // responsecode here
 //}

NSXMLParser *parser = [[NSXMLParser alloc] initWithData: [ result dataUsingEncoding:NSASCIIStringEncoding]];
//NSXMLParser *parser = [[NSXMLParser alloc] initWithData: [ fakeResponse dataUsingEncoding:NSUTF8StringEncoding]];

[parser setDelegate:self]; // The parser calls methods in this class
//[parser setShouldProcessNamespaces:NO]; // We don't care about namespaces
//[parser setShouldReportNamespacePrefixes:NO]; //
//[parser setShouldResolveExternalEntities:NO]; // We just want data, no other stuff

[parser parse]; // Parse that data..

和委托方法

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
      NSLog(@"chars: %s", string);
  }

 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName  namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName  attributes:(NSDictionary *)attributeDict{


  NSLog(@"open: %s %s, %s", elementName, namespaceURI, qName);
   }

  - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {


   NSLog(@"close: %s", elementName); 
   }

我也尝试了不同的编码，例如 ANSI 和 UTF8 .. 但我仍然得到以下结果：

2010-02-17 09:29:18.377 SupportServiceWSTest[403:20b] Response Code: 200
2010-02-17 09:29:18.378 SupportServiceWSTest[403:20b] Response: <?xml version="1.0"
encoding="UTF-8"?><Books><Book id="1"><title>Circumference</title><author>Nicholas  
Nicastro</author><summary>Eratosthenes and the Ancient Quest to Measure the   
Globe.</summary></Book><Book id="2"><title>Copernicus Secret</title><author>Jack  
Repcheck</author><summary>How the scientific revolution began</summary></Book><Book 
id="3"><title>Angels and Demons</title><author>Dan Brown</author><summary>Robert 
Langdon is summoned to a Swiss research facility to analyze a cryptic symbol seared into 
the chest of a murdered physicist.</summary></Book><Book id="4"><title>Keep the 
Aspidistra Flying</title><author>George Orwell</author><summary>A poignant and 
ultimately hopeful look at class and society, Keep the Aspidistra Flying pays tribute 
to the stubborn virtues of ordinary people who keep the aspidistra 
flying.</summary></Book></Books>
2010-02-17 09:29:18.379 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.381 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.381 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.382 SupportServiceWSTest[403:20b] chars: †Êá
2010-02-17 09:29:18.382 SupportServiceWSTest[403:20b] close: †Êá
2010-02-17 09:29:18.383 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.383 SupportServiceWSTest[403:20b] chars: †Êá
2010-02-17 09:29:18.384 SupportServiceWSTest[403:20b] close: †Êá
2010-02-17 09:29:18.384 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.385 SupportServiceWSTest[403:20b] chars: †Êá
2010-02-17 09:29:18.385 SupportServiceWSTest[403:20b] close: †Êá
2010-02-17 09:29:18.386 SupportServiceWSTest[403:20b] close: †Êá
2010-02-17 09:29:18.386 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.387 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.387 SupportServiceWSTest[403:20b] chars: †Êá
2010-02-17 09:29:18.388 SupportServiceWSTest[403:20b] close: †Êá
2010-02-17 09:29:18.388 SupportServiceWSTest[403:20b] open: †Êá (null), (null)
2010-02-17 09:29:18.389 SupportServiceWSTest[403:20b] chars: †Êá

Answer 1

一个问题是您使用的是NSASCIIStringEncoding。 XML 是 UTF8 编码的（在 XML 响应中指定），因此您应该使用 NSUTF8StringEncoding。

另一个问题是您在 NSLog 调用 NSString 对象时使用了 %s，这不起作用。 %s 用于 C 字符串、以空结尾的字符数组，而不是对象。将 %s 替换为 %@。

%@ 在NSLog 中使用时，将对任何与其匹配的参数对象调用description 方法。对于NSStrings 的描述会打印出字符串的内容。