[Expat-discuss] Text data handler

[Thomás Inskip]

Sure thing.

// creates parser, sets handler
XMLConnectionEncoder::XMLConnectionEncoder(EncodedConnection 
&connection) :
	ConnectionEncoder(connection)
{
     mParser = XML_ParserCreate(NULL);
     XML_SetUserData(mParser, this);
     XML_SetElementHandler(mParser,
                           XMLConnectionEncoder::Element_Start,
                           XMLConnectionEncoder::Element_End);
     XML_SetCharacterDataHandler(mParser,
                                 XMLConnectionEncoder::Element_Text);
}

void XMLConnectionEncoder::Decode(EncodedConnectionBuffer &source)
{
     XML_Parse(mParser, &source[0], source.size(), false);
}


void XMLCALL XMLConnectionEncoder::Element_Start(void *userData,
                                                  const XML_Char *name,
                                                  const XML_Char 
**attributes)
{
     XMLConnectionEncoder *encoder = (XMLConnectionEncoder *)userData;
     const XML_Char **attrPtr = attributes;

     EM_Element *theElement = new EM_Element;
     theElement->SetName(name);
     while (*attrPtr != NULL) {
         theElement->AddAttribute(attrPtr[0], attrPtr[1]);
         attrPtr += 2;
     }
     encoder->mStack.push_back(theElement);
     encoder->mText.clear();
}


void XMLCALL XMLConnectionEncoder::Element_End(void *userData,
                                                const XML_Char *name)
{
     XMLConnectionEncoder *encoder = (XMLConnectionEncoder *)userData;

     if (encoder->mStack.size() > 0) {
         EM_Element *theElement = encoder->mStack.back();
         encoder->mStack.pop_back();
         if (encoder->mText.size() > 0)
             theElement->SetValue(encoder->mText);
         if (encoder->mStack.size() > 0) {
             encoder->mStack.back()->AddElement(theElement);
             delete theElement;
         } else
             encoder->Receive(theElement);
     } else {
         // Do someething else here
         Dprintf("Mismatched calls to 
XMLConnectionEndoder::Element_Start and 
XMLConnectionEndoder::Element_End");
     }
}


void XMLCALL XMLConnectionEncoder::Element_Text(void *userData,
                                                 const XML_Char *text,
                                                 int len)
{
     XMLConnectionEncoder *encoder = (XMLConnectionEncoder *)userData;
     encoder->mText.append(text, len);
}


That's all of it, actually.  The last three member functions of 
XMLConnectionEncoder (Element_*) are static.

An example of the xml being parsed:

3c 45 6e 63 72 79 70 74 41 73 73 65 74 20 53 65 <EncryptAsset Se
73 73 69 6f 6e 49 44 3d 22 30 22 20 53 65 71 75 ssionID="0" Sequ
65 6e 63 65 4e 75 6d 62 65 72 3d 22 31 22 3e 3c enceNumber="1"><
49 6e 70 75 74 46 69 6c 65 3e 2f 68 6f 6d 65 2f InputFile>/home/
74 6f 6d 61 73 2f 6d 70 65 67 2f 63 6e 6e 2e 6d tomas/mpeg/cnn.m
70 67 3c 2f 49 6e 70 75 74 46 69 6c 65 3e 3c 4f pg</InputFile><O
75 74 70 75 74 46 69 6c 65 3e 2f 76 61 72 2f 74 utputFile>/var/t
6d 70 2f 30 30 30 30 30 30 30 30 32 30 2e 6d 70 mp/0000000020.mp
67 3c 2f 4f 75 74 70 75 74 46 69 6c 65 3e 3c 41 g</OutputFile><A

and so on..  but my character data handler never gets called.  Afaik it 
looks like valid XML.

Thanks.


On May 21, 2004, at 3:23 PM, Karl Waclawek wrote:

>
> ----- Original Message -----
> From: "Thomás Inskip" <tinskip at widevine.com>
> To: <expat-discuss at libexpat.org>
> Sent: Friday, May 21, 2004 3:16 PM
>
>
>> I am new to Expat (been using it for a few hours), and have run into a
>> snag.  I am hoping someone can tell me what I am doing wrong.
>>
>> I am trying to parse some pretty simple ascii-encoded XML.  I have set
>> my element start and end handlers via XML_SetElementHandler.  Those 
>> get
>> called just fine.  I have also set the character data handler via
>> XML_SetCharacterDataHandler, which is not getting called.  A sample 
>> xml
>> string which would cause the failure would be :
>> <a><b>some text</b></a>
>> I would have expected my character data handler to be called with 
>> "some
>> text" when parsing the xml stream in question, but it is not.   Am I
>> using the wrong handler?  Is there another way to accomplish this.  
>> Any
>> help would be appreciated.
>
> The way you describe it it should work.
> Why don't you post (a short relevant piece of) your code?
>
> Karl
>
>
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