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Thread: Fix error missing ':' before identifier 'slots'

  1. 16th February 2016, 07:10 #1
    neda
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    Default Fix error missing ':' before identifier 'slots'

    Hi,
    I create new C++ class:

    myxmlclass.h:
    Qt Code: 
    1. #ifndef MYXMLCLASS_H
    2. #define MYXMLCLASS_H
    3.  
    4.  
    5. class MyXMLClass
    6. {
    7. public:
    8.     MyXMLClass();
    9.  
    10. public slots:
    11.     void SaveXMLFile();
    12.     void ReadXMLFile();
    13. };
    14.  
    15. #endif // MYXMLCLASS_H
    To copy to clipboard, switch view to plain text mode 

    myxmlclass.cpp:
    Qt Code: 
    1. #include <myxmlclass.h>
    2. #include <QFileDialog>
    3. #include <QXmlStreamWriter>
    4.  
    5. void MyXMLClass::SaveXMLFile()
    6. {
    7.  
    8.     QString filename = QFileDialog::getSaveFileName(this,
    9.                                        tr("Save Xml"), ".",
    10.                                        tr("Xml files (*.xml)"));
    11.  
    12.  
    13.     QFile file(filename);
    14.     file.open(QIODevice::WriteOnly);
    15.  
    16.     QXmlStreamWriter xmlWriter(&file);
    17.     xmlWriter.setAutoFormatting(true);
    18.     xmlWriter.writeStartDocument();
    19.  
    20.     xmlWriter.writeStartElement("LAMPS");
    21.  
    22.     xmlWriter.writeStartElement("LIGHT1");
    23.     xmlWriter.writeTextElement("State", "statevalue" );
    24.     xmlWriter.writeTextElement("Room", "roomvalue");
    25.     xmlWriter.writeTextElement("Potencial", "potencialvalue");
    26.  
    27.     xmlWriter.writeEndElement();
    28.  
    29.         file.close();
    30. }
    31.  
    32.  
    33.  
    34. void MyXMLClass::ReadXMLFile()
    35. {
    36.     QXmlStreamReader Rxml;
    37.  
    38.     QString filename = QFileDialog::getOpenFileName(this,
    39.         tr("Open Xml"), ".",
    40.         tr("Xml files (*.xml)"));
    41.  
    42.     QFile file(filename);
    43.     if (!file.open(QFile::ReadOnly | QFile::Text))
    44.     {
    45.         std::cerr << "Error: Cannot read file " << qPrintable(filename)
    46.             << ": " << qPrintable(file.errorString())
    47.             << std::endl;
    48.  
    49.     }
    50.  
    51.     Rxml.setDevice(&file);
    52.     Rxml.readNext();
    53.  
    54.     while (!Rxml.atEnd())
    55.     {
    56.         if (Rxml.isStartElement())
    57.         {
    58.             if (Rxml.name() == "LAMPS")
    59.             {
    60.                 Rxml.readNext();
    61.             }
    62.             else if (Rxml.name() == "LIGHT1")
    63.             {
    64.                 while (!Rxml.atEnd())
    65.                 {
    66.                     if (Rxml.isEndElement())
    67.                     {
    68.                         Rxml.readNext();
    69.                         break;
    70.                     }
    71.                     else if (Rxml.isCharacters())
    72.                     {
    73.                         Rxml.readNext();
    74.                     }
    75.                     else if (Rxml.isStartElement())
    76.                     {
    77.                         if (Rxml.name() == "State")
    78.                         {
    79.                             ReadStateElement();
    80.                         }
    81.                         else if (Rxml.name() == "Room")
    82.                         {
    83.                             ReadRoomElement();
    84.                         }
    85.                         else if (Rxml.name() == "Potencial")
    86.                         {
    87.                             ReadPotencialElement();
    88.                         }
    89.                         Rxml.readNext();
    90.                     }
    91.                     else
    92.                     {
    93.                         Rxml.readNext();
    94.                     }
    95.                 }
    96.             }
    97.         }
    98.         else
    99.         {
    100.             Rxml.readNext();
    101.         }
    102.  
    103.         file.close();
    104.  
    105.         if (Rxml.hasError())
    106.         {
    107.             std::cerr << "Error: Failed to parse file "
    108.                 << qPrintable(filename) << ": "
    109.                 << qPrintable(Rxml.errorString()) << std::endl;
    110.         }
    111.         else if (file.error() != QFile::NoError)
    112.         {
    113.             std::cerr << "Error: Cannot read file " << qPrintable(filename)
    114.                 << ": " << qPrintable(file.errorString())
    115.                 << std::endl;
    116.         }
    117.     }
    118. }
    119.  
    120.  
    121.  
    122. //Example for Room Element
    123.  
    124. void MyXMLClass::ReadRoomElement()
    125. {
    126.     while(!Rxml.atEnd())
    127.     {
    128.         if(Rxml.isEndElement())
    129.         {
    130.             Rxml.readNext();
    131.             break;
    132.         }
    133.         else if(Rxml.isStartElement())
    134.         {
    135.             QString roomelement = Rxml.readElementText();   //Get the xml value
    136.             Rxml.readNext();
    137.             break;
    138.         }
    139.         else if(Rxml.isCharacters())
    140.         {
    141.             Rxml.readNext();
    142.         }
    143.         else
    144.         {
    145.             Rxml.readNext();
    146.         }
    147.     }
    148.  
    149. }
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    I have syntax error : missing ':' before identifier 'slots'.
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  2. 16th February 2016, 08:04 #2
    Lesiok
    Lesiok is offline Expert
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    Default Re: Fix error missing ':' before identifier 'slots'

    Between lines 6 and 7 in myxmlclass.h add :
    Qt Code: 
    1. Q_OBJECT
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  3. The following user says thank you to Lesiok for this useful post:

    neda (16th February 2016)
  4. 16th February 2016, 08:58 #3
    anda_skoa
    anda_skoa is offline Administrator
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    Default Re: Fix error missing ':' before identifier 'slots'

    Quote Originally Posted by Lesiok View Post
    Between lines 6 and 7 in myxmlclass.h add :
    Qt Code: 
    1. Q_OBJECT
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    And include <QObject> and derive from QObject

    Cheers,
    _
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  5. The following user says thank you to anda_skoa for this useful post:

    neda (16th February 2016)
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