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trying to use QXmlParser and friends

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  • M mzimmers
    16 Apr 2020, 22:06

    Well, I shouldn't have declared victory so quickly. When I migrated my test code into my app, I got this error:

    C:\wifibutton\utility\xmlparser.h:16: error: 'XmlHandler' does not name a type; did you mean 'XmlParser'?
         XmlHandler m_handler;
         ^~~~~~~~~~
         XmlParser
    

    Here are some snippets:

    class XmlHandler : public QXmlDefaultHandler
    {
    private:
        MsgHash m_hash;
    public:
        XmlHandler();
    ...
    }
    
    #include "xmlhandler.h"
    
    class XmlParser
    {
        QXmlSimpleReader m_reader;
        XmlHandler m_handler;
       ...
    }
    

    Is there something special I need to know about sub-classing QXmlDefaultHandler, or am I just brain-fading here?

    Thanks...

    M Offline
    M Offline
    mrjj
    Lifetime Qt Champion
    wrote on 16 Apr 2020, 22:11 last edited by
    #9

    @mzimmers
    Just to be sure its not that.
    Does xmlparser.h include XmlHandler.h and reverse ?
    (circular include)

    M 1 Reply Last reply 16 Apr 2020, 22:15
    0
    • M mrjj
      16 Apr 2020, 22:11

      @mzimmers
      Just to be sure its not that.
      Does xmlparser.h include XmlHandler.h and reverse ?
      (circular include)

      M Offline
      M Offline
      mzimmers
      wrote on 16 Apr 2020, 22:15 last edited by
      #10

      @mrjj no. xmlparser.h includes xmlhandler.h, but not the other way around.

      M 1 Reply Last reply 16 Apr 2020, 22:17
      0
      • M mzimmers
        16 Apr 2020, 22:15

        @mrjj no. xmlparser.h includes xmlhandler.h, but not the other way around.

        M Offline
        M Offline
        mrjj
        Lifetime Qt Champion
        wrote on 16 Apr 2020, 22:17 last edited by
        #11

        @mzimmers
        Ok, just had to be sure :)

        It simply says it don't know type so it don't see the include for some reason.

        Did you try clean all, rebuild ?

        1 Reply Last reply
        0
        • M Offline
          M Offline
          mzimmers
          wrote on 16 Apr 2020, 22:21 last edited by
          #12

          Yes, I did.

          Here's the complete code from the headers:

          xmlhandler.h

          #ifndef XMLHANDLER_H
          #define XMLHANDLER_H
          
          
          #include <QXmlDefaultHandler>
          
          #include "message.h"
          
          using namespace std;
          
          class XmlHandler : public QXmlDefaultHandler
          {
          private:
              MsgHash m_hash;
              bool m_tagStarted = false;
              QString m_tag;
              QString m_data;
              QXmlInputSource *m_source;
          
          public:
              XmlHandler();
              ~XmlHandler();
              bool startElement(const QString &uri,
                                const QString &local,
                                const QString &name,
                                const QXmlAttributes &atts) override;
              bool endElement(const QString &uri,
                                const QString &local,
                                const QString &name) override;
              bool characters(const QString &ch) override;
              void getHash(MsgHash &msgHash) {msgHash = m_hash;}
          };
          
          
          #endif // XMLHANDLER_H
          

          xmlparser.h:

          #ifndef XMLPARSER_H
          #define XMLPARSER_H
          
          #include <stdint.h>
          
          #include <QXmlDefaultHandler>
          #include <QXmlSimpleReader>
          
          #include "constants.h"
          #include "message.h"
          #include "xmlhandler.h"
          
          class XmlParser
          {
              QXmlSimpleReader m_reader;
              XmlHandler m_handler;
          public:
              XmlParser();
              ~XmlParser();
              int process(string xml, MsgHash &msgHash);
          };
          
          #endif // XMLPARSER_H
          
          1 Reply Last reply
          0
          • M Offline
            M Offline
            mrjj
            Lifetime Qt Champion
            wrote on 16 Apr 2020, 22:24 last edited by
            #13

            Hi
            It looks ok.
            Could you try add some dummy class to the xmlhandler.h

            class Test {
            };

            and see if it can see that symbol ?

            just to test it dont see the include and not something with class XmlHandler

            M 1 Reply Last reply 16 Apr 2020, 22:27
            0
            • M mrjj
              16 Apr 2020, 22:24

              Hi
              It looks ok.
              Could you try add some dummy class to the xmlhandler.h

              class Test {
              };

              and see if it can see that symbol ?

              just to test it dont see the include and not something with class XmlHandler

              M Offline
              M Offline
              mzimmers
              wrote on 16 Apr 2020, 22:27 last edited by mzimmers
              #14

              @mrjj good test -- it didn't see that either. I wonder if XMLHANDLER_H is a reserved term...?

              ANSWER: no it isn't...

              M 1 Reply Last reply 16 Apr 2020, 22:36
              0
              • M mzimmers
                16 Apr 2020, 22:27

                @mrjj good test -- it didn't see that either. I wonder if XMLHANDLER_H is a reserved term...?

                ANSWER: no it isn't...

                M Offline
                M Offline
                mrjj
                Lifetime Qt Champion
                wrote on 16 Apr 2020, 22:36 last edited by
                #15

                @mzimmers

                Hmm can you check your .pro file its not listed 2 times ?

                Also
                can you please inspect both files
                with Include Hierarchy?

                alt text
                The last.

                and see if you see anything odd.

                M 2 Replies Last reply 16 Apr 2020, 22:45
                1
                • M mrjj
                  16 Apr 2020, 22:36

                  @mzimmers

                  Hmm can you check your .pro file its not listed 2 times ?

                  Also
                  can you please inspect both files
                  with Include Hierarchy?

                  alt text
                  The last.

                  and see if you see anything odd.

                  M Offline
                  M Offline
                  mzimmers
                  wrote on 16 Apr 2020, 22:45 last edited by
                  #16

                  @mrjj that wasn't it exactly, but you put me on the right track. I'll report back in a bit.

                  Thanks...

                  1 Reply Last reply
                  0
                  • M mrjj
                    16 Apr 2020, 22:36

                    @mzimmers

                    Hmm can you check your .pro file its not listed 2 times ?

                    Also
                    can you please inspect both files
                    with Include Hierarchy?

                    alt text
                    The last.

                    and see if you see anything odd.

                    M Offline
                    M Offline
                    mzimmers
                    wrote on 16 Apr 2020, 22:59 last edited by
                    #17

                    @mrjj great suggestion there! Long story short, I had a cyclic dependency. Thanks for your help on this.

                    1 Reply Last reply
                    1
                    • M Offline
                      M Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on 16 Apr 2020, 23:03 last edited by
                      #18

                      Super :)
                      Well it's my number one suspect when it says "don't know symbol"
                      and you check you have the header included and all seem fine.

                      1 Reply Last reply
                      0

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                      16 Apr 2020, 23:03

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