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Thread: need help in qt code

  1. 27th August 2010, 10:58 #1
    doforumda
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    Default need help in qt code

    hi

    i am following "The Book Of Qt 4 The art of Building Qt Applications" and trying the following example which converts byte to decimal, hexadecimal and binary but when i run, it produces error

    here is the code
    byteconverterdialog.h file
    Qt Code: 
    1. #ifndef BYTECONVERTERDIALOG_H
    2. #define BYTECONVERTERDIALOG_H
    3.  
    4. #include <QDialog>
    5.  
    6. class byteConverterDialog : public QDialog
    7. {
    8.     Q_OBJECT
    9.  
    10. public:
    11.     byteConverterDialog();
    12. };
    13.  
    14. #endif // BYTECONVERTERDIALOG_H
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    byteconverter.h
    Qt Code: 
    1. #ifndef BYTECONVERTER_H
    2. #define BYTECONVERTER_H
    3.  
    4. #include <QObject>
    5.  
    6. class ByteConverter : public QObject
    7. {
    8.     Q_OBJECT
    9.  
    10. public:
    11.     ByteConverter(QObject* = 0);
    12.  
    13. public slots:
    14.     void setDec(const QString &);
    15.     void setHex(const QString &);
    16.     void setBin(const QString &);
    17.  
    18. signals:
    19.     void decChanged(const QString&);
    20.     void hexChanged(const QString&);
    21.     void binChanged(const QString&);
    22. };
    23.  
    24. #endif // BYTECONVERTER_H
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    byteconverterdialog.cpp
    Qt Code: 
    1. #include "byteconverterdialog.h"
    2. #include "byteconverter.h"
    3. #include <QLabel>
    4. #include <QLineEdit>
    5. #include <QPushButton>
    6. #include <QVBoxLayout>
    7. #include <QHBoxLayout>
    8. #include <QGridLayout>
    9. #include <QIntValidator>
    10.  
    11. byteConverterDialog::byteConverterDialog()
    12. {
    13.     //generate the necessary layouts
    14.     QVBoxLayout *mainLayout = new QVBoxLayout(this);
    15.     QGridLayout *editLayout = new QGridLayout;
    16.     QHBoxLayout *buttonLayout = new QHBoxLayout;
    17.  
    18.     mainLayout->addLayout(editLayout);
    19.     mainLayout->addStretch();
    20.     mainLayout->addLayout(buttonLayout);
    21.  
    22.     //generate the labels and line-edits and add them to the object pointed at by editLayout
    23.     QLabel *decLabel = new QLabel(tr("Decimal"));
    24.     QLabel *hexLabel = new QLabel(tr("hexadecimal"));
    25.     QLabel *binLabel = new QLabel(tr("Binary"));
    26.  
    27.     decEdit = new QLineEdit;
    28.     hexEdit = new QLineEdit;
    29.     binEdit = new QLineEdit;
    30.  
    31.     editLayout->addWidget(decLabel, 0, 0);
    32.     editLayout->addWidget(decEdit, 0, 1);
    33.     editLayout->addWidget(hexLabel, 1, 0);
    34.     editLayout->addWidget(hexEdit, 1, 1);
    35.     editLayout->addWidget(binLabel, 2, 0);
    36.     editLayout->addWidget(binEdit, 2, 1);
    37.  
    38.     //create the quit button and add it to the object pointed at by buttonLayout.
    39.     QPushButton *exitButton = new QPushButton(tr("Quit"));
    40.  
    41.     buttonLayout->addStretch();
    42.     buttonLayout->addWidget(exitButton);
    43.     exitButton->setDefault(true);
    44.  
    45.     QIntValidator* decValidator =
    46.     new QIntValidator(0, 255, decEdit);
    47.     decEdit->setValidator(decValidator);
    48.     QRegExpValidator* hexValidator =
    49.     new QRegExpValidator(QRegExp("[0-9A-Fa-f]{1,2}"), hexEdit);
    50.     hexEdit->setValidator(hexValidator);
    51.     QRegExpValidator* binValidator =
    52.     new QRegExpValidator(QRegExp("[01]{1,8}"), binEdit);
    53.     binEdit->setValidator(binValidator);
    54.  
    55.     setWindowTitle(tr("Byte Converter"));
    56.  
    57.     connect(exitButton, SIGNAL(clicked()), this, SLOT(accept()));
    58.  
    59.     ByteConverter* bc = new ByteConverter(this);
    60.  
    61.     connect(decEdit, SIGNAL(textChanged(const QString &)), bc, SLOT(setDec(const QString &)));
    62.     connect(hexEdit, SIGNAL(textChanged(const QString &)), bc, SLOT(setHex(const QString &)));
    63.     connect(binEdit, SIGNAL(textChanged(const QString &)), bc, SLOT(setBin(const QString &)));
    64.  
    65.     connect(bc, SIGNAL(decChanged(const QString&)), decEdit, SLOT(setText(const QString&)));
    66.     connect(bc, SIGNAL(hexChanged(const QString&)), hexEdit, SLOT(setText(const QString&)));
    67.     connect(bc, SIGNAL(binChanged(const QString&)), binEdit, SLOT(setText(const QString&)));
    68. }
    69.  
    70. void byteConverterDialog::decChanged(const QString& newValue)
    71. {
    72.     bool ok;
    73.     int num = newValue.toInt(&ok);
    74.     if(ok) {
    75.         hexEdit->setText(QString::number(num, 16));
    76.         binEdit->setText(QString::number(num, 2));
    77.     }
    78.     else {
    79.         hexEdit->setText("");
    80.         binEdit->setText("");
    81.     }
    82. }
    83.  
    84. void byteConverterDialog::hexChanged(const QString& newValue)
    85. {
    86.     bool ok;
    87.     int num = newValue.toInt(&ok);
    88.     if(ok) {
    89.         decEdit->setText(QString::number(num));
    90.         binEdit->setText(QString::number(num, 2));
    91.     }
    92.     else {
    93.         decEdit->setText("");
    94.         binEdit->setText("");
    95.     }
    96. }
    97.  
    98. void byteConverterDialog::binChanged(const QString& newValue)
    99. {
    100.     bool ok;
    101.     int num = newValue.toInt(&ok);
    102.     if(ok) {
    103.         decEdit->setText(QString::number(num));
    104.         hexEdit->setText(QString::number(num, 16));
    105.     }
    106.     else {
    107.         hexEdit->setText("");
    108.         decEdit->setText("");
    109.     }
    110. }
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    byteconverter.cpp
    Qt Code: 
    1. #include "byteconverter.h"
    2.  
    3. ByteConverter::ByteConverter(QObject* parent) : QObject(parent)
    4. {
    5. }
    6.  
    7. void ByteConverter::setDec(const QString& newValue)
    8. {
    9.     bool ok;
    10.     int num = newValue.toInt(&ok);
    11.     if(ok) {
    12.         emit hexChanged(QString::number(num, 16));
    13.         emit binChanged(QString::number(num, 2));
    14.     }
    15.     else {
    16.         emit hexChanged("");
    17.         emit binChanged("");
    18.     }
    19. }
    20.  
    21. void ByteConverter::setHex(const QString& newValue)
    22. {
    23.     bool ok;
    24.     int num = newValue.toInt(&ok, 16);
    25.     if(ok) {
    26.         emit decChanged(QString::number(num));
    27.         emit binChanged(QString::number(num, 2));
    28.     }
    29.     else {
    30.         emit decChanged("");
    31.         emit binChanged("");
    32.     }
    33. }
    34.  
    35. void ByteConverter::setBin(const QString& newValue)
    36. {
    37.     bool ok;
    38.     int num = newValue.toInt(&ok, 2);
    39.     if(ok) {
    40.         emit decChanged(QString::number(num));
    41.         emit hexChanged(QString::number(num, 16));
    42.     }
    43.     else {
    44.         emit decChanged("");
    45.         emit hexChanged("");
    46.     }
    47. }
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    main.cpp
    Qt Code: 
    1. #include <QtGui/QApplication>
    2. #include "byteconverterdialog.h"
    3.  
    4. int main(int argc, char *argv[])
    5. {
    6.     QApplication a(argc, argv);
    7.     byteConverterDialog bc;
    8.     bc.setAttribute(Qt::WA_QuitOnClose);
    9.     bc.show();
    10.  
    11.     return a.exec();
    12. }
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    when i run this code, it displays these errors

    Qt Code: 
    1. decEdit was not declared in this scope  byteconverterdialog.cpp 27
    2. hexEdit was not declared in this scope  byteconverterdialog.cpp 28
    3. binEdit was not declared in this scope  byteconverterdialog.cpp 29
    4.  
    5. void byteConverterDialog::decChanged(const QString&) member function declared in class byteConverterDialog   byteconverterdialog.cpp 70
    6. void byteConverterDialog::hexChanged(const QString&) member function declared in class byteConverterDialog   byteconverterdialog.cpp 84
    7. void byteConverterDialog::binChanged(const QString&) member function declared in class byteConverterDialog   byteconverterdialog.cpp 98
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  2. 27th August 2010, 11:13 #2
    aamer4yu's Avatar
    aamer4yu
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    Default Re: need help in qt code

    As the error says... you have not declared decEdit,hexEdit and binEdit...
    Something like QLineEdit * decEdit = new QLineEdit;
    or m_decEdit = new QLineEdit; // Where m_decEdit is member variable.
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  3. 27th August 2010, 11:24 #3
    doforumda
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    Default Re: need help in qt code

    in which class should i declare these?
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  4. 27th August 2010, 13:05 #4
    doforumda
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    Default Re: need help in qt code

    this is what i got in Compile Output tab
    Qt Code: 
    1. Running build steps for project byteConverter...
    2. Configuration unchanged, skipping qmake step.
    3. Starting: "C:/Qt/2010.04/mingw/bin/mingw32-make.exe" -w 
    4. mingw32-make: Entering directory `C:/Users/Administrator/Documents/byteConverter-build-desktop' 
    5. C:/Qt/2010.04/mingw/bin/mingw32-make -f Makefile.Debug 
    6. mingw32-make[1]: Entering directory `C:/Users/Administrator/Documents/byteConverter-build-desktop' 
    7. g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2010.04\qt\include\QtCore" -I"..\..\..\..\Qt\2010.04\qt\include\QtGui" -I"..\..\..\..\Qt\2010.04\qt\include" -I"..\..\..\..\Qt\2010.04\qt\include\ActiveQt" -I"debug" -I"." -I"..\byteConverter" -I"." -I"..\..\..\..\Qt\2010.04\qt\mkspecs\win32-g++" -o debug\byteconverterdialog.o ..\byteConverter\byteconverterdialog.cpp 
    8. mingw32-make[1]: Leaving directory `C:/Users/Administrator/Documents/byteConverter-build-desktop' 
    9. mingw32-make: Leaving directory `C:/Users/Administrator/Documents/byteConverter-build-desktop' 
    10. ..\byteConverter\byteconverterdialog.cpp: In constructor 'byteConverterDialog::byteConverterDialog()': 
    11. ..\byteConverter\byteconverterdialog.cpp:27: error: 'm_decEdit' was not declared in this scope 
    12. ..\byteConverter\byteconverterdialog.cpp:28: error: 'hexEdit' was not declared in this scope 
    13. ..\byteConverter\byteconverterdialog.cpp:29: error: 'binEdit' was not declared in this scope 
    14. ..\byteConverter\byteconverterdialog.cpp:32: error: 'decEdit' was not declared in this scope 
    15. ..\byteConverter\byteconverterdialog.cpp: At global scope: 
    16. ..\byteConverter\byteconverterdialog.cpp:70: error: no 'void byteConverterDialog::decChanged(const QString&)' member function declared in class 'byteConverterDialog' 
    17. ..\byteConverter\byteconverterdialog.cpp:84: error: no 'void byteConverterDialog::hexChanged(const QString&)' member function declared in class 'byteConverterDialog' 
    18. ..\byteConverter\byteconverterdialog.cpp:98: error: no 'void byteConverterDialog::binChanged(const QString&)' member function declared in class 'byteConverterDialog' 
    19. mingw32-make[1]: *** [debug/byteconverterdialog.o] Error 1 
    20. mingw32-make: *** [debug] Error 2 
    21. The process "C:/Qt/2010.04/mingw/bin/mingw32-make.exe" exited with code %2.
    22. Error while building project byteConverter (target: Desktop)
    23. When executing build step 'Make'
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  5. 27th August 2010, 13:20 #5
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    aamer4yu
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    Default Re: need help in qt code

    A variable needs to be of some type..
    you cannot simply write
    xyz = something; You need to define what type of is xyz, is it int, QString, QWidget etc...
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  6. 27th August 2010, 13:27 #6
    tbscope
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    Default Re: need help in qt code

    To answer your question of where to add it:

    Qt Code: 
    1. #ifndef BYTECONVERTERDIALOG_H
    2. #define BYTECONVERTERDIALOG_H
    3.  
    4. #include <QDialog>
    5.  
    6. class byteConverterDialog : public QDialog
    7. {
    8.     Q_OBJECT
    9.  
    10. public:
    11.     byteConverterDialog();
    12.  
    13. private:
    14.     // <----------Here. 
    15. };
    16.  
    17. #endif // BYTECONVERTERDIALOG_H
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