使用NSXMLParser initWithStream:没有收到解析器委托方法

Question

我正在处理的基本问题是使用NSStream类来解析传入的增量XML数据.数据永远不是一个完整的XML文档,但我希望根据套接字可以读取的内容以增量块的形式接收和处理它.

看一下文档NSXMLParser,似乎initWithStream:初始化a 的方法NSXMLParser将是我问题的完美解决方案.我可以使用a初始化解析器,NSInputStream然后在我通过套接字接收数据时调用该parse方法,然后NSXMLParser应该调用NSXMLParser委托.

但是,我没有看到任何被调用的委托,我看到被调用的唯一方法是流委托stream:handleEvent:.Apple或其他开发人员似乎很少或没有此API的示例.关于我做错了什么或如何initWithStream:正确使用的任何想法？

ContentParser.h

@interface ContentParser : NSObject <NSStreamDelegate, 
                                     NSXMLParserDelegate>
{
   NSInputStream *inputStream;
   NSOutputStream *outputStream;
   NSMutableData *receivedData;
   NSXMLParser *xmlParser;
}
- (void)initStream;

ContentParser.m

@implementation ContentParser

- (void)initStream
{    
   CFReadStreamRef readStream;
   CFWriteStreamRef writeStream;

   CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, 
                                     (CFStringRef)@"<hostname>", 
                                     <port>, 
                                     &readStream, 
                                     &writeStream);

   inputStream = (__bridge NSInputStream *)readStream;
   outputStream = (__bridge NSOutputStream *)writeStream;

   inputStream.delegate = self;
   outputStream.delegate = self;

   [inputStream  scheduleInRunLoop:[NSRunLoop currentRunLoop]
                           forMode:NSDefaultRunLoopMode];
   [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] 
                           forMode:NSDefaultRunLoopMode];

   [inputStream open];
   [outputStream open];

   xmlParser = [[NSXMLParser alloc] initWithStream:inputStream];
   [xmlParser setDelegate:self];
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 
                                        namespaceURI:(NSString *)namespaceURI 
                                       qualifiedName:(NSString *)qName 
                                          attributes:(NSDictionary *)attributeDict
{
   NSLog(@"didStartElement: %@, attributeDict: %@", elementName, attributeDict);
}

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

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 
                                      namespaceURI:(NSString *)namespaceURI 
                                     qualifiedName:(NSString *)qName
{
   NSLog(@"didEndElement: %@", elementName);
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
   NSLog(@"Error %ld, Description: %@, Line: %ld, Column: %ld", 
      [parseError code], [[parser parserError] localizedDescription], 
      [parser lineNumber], [parser columnNumber]);
}


- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode
{
   switch (eventCode) {
       case NSStreamEventHasBytesAvailable:
       {
           if (stream == inputStream) {
               NSInputStream *is = (NSInputStream *)stream;
               if (receivedData == nil) {
                   receivedData = [[NSMutableData alloc] init];
               }

               uint8_t buf[1024];
               NSInteger bytesRead = [is read:buf maxLength:1024];
               if (bytesRead == -1) {
                  NSLog(@"Network read error");
               } else if (bytesRead == 0) {
                  NSLog(@"No buffer received");
               } else {
                  [receivedData appendBytes:buf length:bytesRead];
                  BOOL parserResult = [xmlParser parse];
                  if (parserResult == NO) {
                     NSLog(@"Unable to parse XML");
                  }
               }
           }
           break;
       }
       default:
          break;
    }
}

@end

Answer 1

我弄清楚问题是什么,并在这里回答它,因为将来+[NSXMLParser initWithStream]有其他人遇到这个问题,因为那里没有很多文档.

我需要-[NSXMLParser parse]在分配NSXMLParser并将自己设置为委托后立即致电.但因为它是一个同步函数,我需要将它称为另一个线程,所以我不阻止当前线程,它可以接收NSStream事件.我也不需要让自己成为代表NSInputStream.

这可以很简单地使用Grand Central Dispatch(GCD)完成,如下所示:

// alloc and init the xml parser
xmlParser = [[NSXMLParser alloc] initWithStream:inputStream];
[xmlParser setDelegate:self];

// block to execute
dispatch_block_t dispatch_block = ^(void)
{
    [xmlParser parse];
};

// create a queue with a unique name
dispatch_queue_t dispatch_queue = dispatch_queue_create("parser.queue", NULL);

// dispatch queue
dispatch_async(dispatch_queue, dispatch_block);

// cleanup
dispatch_release(dispatch_queue);

这是完整的工作示例,只是因为任何人都无法按照我上面发布的内容.

ContentParser.h

@interface ContentParser : NSObject <NSStreamDelegate, 
                                     NSXMLParserDelegate>
{
   NSInputStream *inputStream;
   NSOutputStream *outputStream;
   NSMutableData *receivedData;
   NSXMLParser *xmlParser;
}
- (void)initStream;

ContentParser.m

@implementation ContentParser

- (void)initStream
{    
   CFReadStreamRef readStream;
   CFWriteStreamRef writeStream;

   CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, 
                                     (CFStringRef)@"<hostname>", 
                                     <port>, 
                                     &readStream, 
                                     &writeStream);

   inputStream = (__bridge NSInputStream *)readStream;
   outputStream = (__bridge NSOutputStream *)writeStream;

   outputStream.delegate = self;

   [inputStream  scheduleInRunLoop:[NSRunLoop currentRunLoop]
                           forMode:NSDefaultRunLoopMode];
   [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] 
                           forMode:NSDefaultRunLoopMode];

   [inputStream open];
   [outputStream open];

   xmlParser = [[NSXMLParser alloc] initWithStream:inputStream];
   [xmlParser setDelegate:self];

   dispatch_block_t dispatch_block = ^(void)
   {
      [xmlParser parse];
   };
   dispatch_queue_t dispatch_queue = dispatch_queue_create("parser.queue", NULL);
   dispatch_async(dispatch_queue, dispatch_block);
   dispatch_release(dispatch_queue);
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 
                                        namespaceURI:(NSString *)namespaceURI 
                                       qualifiedName:(NSString *)qName 
                                      attributes:(NSDictionary *)attributeDict
{
   dispatch_block_t dispatch_block = ^(void)
   {
      NSLog(@"didStartElement: %@, attributeDict: %@", 
         elementName, attributeDict);
   };
   dispatch_queue_t main_queue = dispatch_get_main_queue();
   dispatch_async(main_queue, dispatch_block);
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
   dispatch_block_t dispatch_block = ^(void)
   {
      NSLog(@"foundCharacters: %@", string);
   };
   dispatch_queue_t main_queue = dispatch_get_main_queue();
   dispatch_async(main_queue, dispatch_block);
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 
                                      namespaceURI:(NSString *)namespaceURI 
                                     qualifiedName:(NSString *)qName
{
   dispatch_block_t dispatch_block = ^(void)
   {
      NSLog(@"didEndElement: %@", elementName);
   };
   dispatch_queue_t main_queue = dispatch_get_main_queue();
   dispatch_async(main_queue, dispatch_block);
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
   dispatch_block_t dispatch_block = ^(void)
   {
      NSLog(@"Error %ld, Description: %@, Line: %ld, Column: %ld", 
         [parseError code], [[parser parserError] localizedDescription], 
         [parser lineNumber], [parser columnNumber]);
   };
   dispatch_queue_t main_queue = dispatch_get_main_queue();
   dispatch_async(main_queue, dispatch_block);
}   

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode
{
   switch (eventCode) {
      case NSStreamEventHasSpaceAvailable:
      {
         /* write bytes to socket */
         break;
      }
      default:
         break;
    }
}

@end