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Thread: An array as a common variable between two classes .

  1. 21st February 2012, 21:50 #1
    hichemnho
    hichemnho is offline Novice
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    Default An array as a common variable between two classes .

    Hello,

    I would like to use an boolean array "M".
    Here is what I want to do:
    -I fill the QTableWidget .
    -After a click on the QPushButton "generer" the boolean array M receives the values that I fiiled in the QTableWidget.
    -after a click on the QPushButton "dessiner" a second window is created "FenDessin" which contains a Draw related to the values of the boolean array M.
    Here is the code:
    Qt Code: 
    1. ///////////the Headers//////////////////////
    2. //FenPrinicipale.h
    3. #ifndef FENPRINCIPALE_H
    4. #define FENPRINCIPALE_H
    5. #include <QtGui>
    6.  
    7. class FenPrincipale : public QWidget
    8. {
    9.     Q_OBJECT
    10. public:
    11.     FenPrincipale();
    12.     bool  M[10][10];
    13. private slots:
    14.     void FillIn();
    15.     void FenetreDessin();
    16. private:
    17.     QTableWidget  *tabM;
    18.     QPushButton * generer;
    19.     QPushButton * dessiner;
    20.     QVBoxLayout * vbox;
    21. };
    22. #endif // FENPRINCIPALE_H
    23.  
    24.  
    25. //FenDessin.h
    26. #ifndef FENDESSIN_H
    27. #define FENDESSIN_H
    28. #include <QtGui>
    29. class FenDessin : public QDialog
    30. {
    31. public:
    32.     FenDessin ( QWidget *parent);
    33.  
    34. private:
    35.     QPushButton *fermer;
    36.     QPainter *painter;
    37. private slots:
    38.     void paintEvent (QPaintEvent *);
    39. };
    40. #endif // FENDESSIN_H
    41.  
    42.  
    43.  
    44. //FenPrincipale.cpp
    45. #include "qDebug.h"
    46. #include "FenPrincipale.h"
    47. #include "FenDessin.h"
    48. FenPrincipale::FenPrincipale()
    49. {
    50.     tabM =new QTableWidget(this);
    51.     tabM->setRowCount(10);
    52.     tabM->setColumnCount(10);
    53.     generer = new QPushButton("&Générer !",this);
    54.     QVBoxLayout* vbox = new QVBoxLayout();
    55.     vbox->addWidget(generer);
    56.     vbox->addWidget(dessiner);
    57.     vbox->addWidget(tabM);
    58.     this->setLayout(vbox);
    59.     for (int r = 0; r < 10; r++) {
    60.         for (int c = 0; c < 10; c++) {
    62.             tabM->setItem(r, c, it);
    63.             it->setData(Qt::EditRole, 0);
    64.  
    65.         }
    66.     }
    67.     connect(generer, SIGNAL(clicked()), this, SLOT(FillIn()));
    68. }
    69. void FenPrincipale::FillIn()
    70. {
    71.     for (int r = 0; r < 10; r++) {
    72.         for (int c = 0; c < 10; c++) {
    73.             QTableWidgetItem *it = tabM->item(r,c);;
    74.             Q_ASSERT(it);
    75.             qDebug() <<it;
    76.             int val = (it->data(Qt::EditRole)).toInt();
    77.             M[r][c] = (val == 1)? true: false;
    78.             qDebug() <<M[r][c];
    79.         }
    80.     }
    81.     connect(dessiner, SIGNAL(clicked()), this, SLOT(FenetreDessin()));
    82. }
    83. void FenPrincipale::FenetreDessin()
    84. {
    85.     FenDessin *fenetreCC = new FenDessin( this);
    86.     fenetreCC->exec();
    87. }
    88.  
    89.  
    90. //FenDessin.cpp
    91. #include "FenDessin.h"
    92. FenDessin::FenDessin( QWidget *parent = 0) :QDialog(parent)
    93. {
    94.     fermer = new QPushButton("Fermer",this);
    96.     paintEvent(c);
    97.     connect(fermer, SIGNAL(clicked()), this, SLOT(accept()));
    98.  
    99. }
    100. void FenDessin::paintEvent(QPaintEvent *c)
    101. {
    102.     QPainter painter(this);
    103.     int o,p;
    104.     for (o=0; o<10; o++)
    105.     {
    106.         for (p=0; p<10; p++)
    107.         {
    108.             M[o][p]=0;
    109.         }
    110.     }
    111.     int  tour=0;
    112.     int x=10;
    113.     int y=10;
    114.     int Num_Sommet=0;
    115.     int T_Coordonnees [10][3];
    116.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    117.     {
    118.         (T_Coordonnees[Num_Sommet][0])=x;
    119.         (T_Coordonnees[Num_Sommet][1])=y;
    120.         (T_Coordonnees[Num_Sommet][2])=tour;
    121.  
    122.         if (tour==0)
    123.         {
    124.             x+=35;
    125.             tour=1;
    126.         }
    127.         else
    128.         {
    129.             y+=55;
    130.             tour=0;
    131.         }
    132.  
    133.     }
    134.  
    135.     int w1=0;
    136.     int w2=0;
    137.     int cpt=10;
    138.     Num_Sommet=0;
    139.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    140.     {
    141.         if ( (T_Coordonnees[Num_Sommet][2])==1)
    142.         {   if(w1==0)
    143.             {
    144.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+500) ;
    145.                 w1=1;
    146.             }
    147.             else
    148.             {
    149.                 if(w1==1)
    150.                 {
    151.                     (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+250+cpt) ;
    152.                     w1=0;
    153.                     cpt=cpt+15;
    154.                 }
    155.             }
    156.             if (Num_Sommet==9)
    157.             {
    158.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
    159.             }
    160.  
    161.         }
    162.         else
    163.         {
    164.             if(w2==0)
    165.             {
    166.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+200;
    167.                 w2=1;
    168.             }
    169.             else
    170.             {
    171.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+100+cpt;
    172.                 w2=0;
    173.                 cpt=cpt+15;
    174.             }
    175.  
    176.             if (Num_Sommet==4)
    177.             {
    178.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
    179.             }
    180.         }
    181.         painter.drawEllipse((T_Coordonnees[Num_Sommet][0]), (T_Coordonnees[Num_Sommet][1]), 30.0, 30.0);
    182.     }
    183.  
    184.     int i,j;
    185.     for (i=0; i<10; i++)
    186.     {
    187.         for (j=0; j<10; j++)
    188.         {
    189.             if (M[i][j]==1)
    190.             {
    191.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
    192.             }
    193.         }
    194.     }
    195.  
    196.  
    197.  
    198.     for (i=0; i<10; i++)
    199.     {
    200.         for (j=0; j<10; j++)
    201.         {
    202.             if ((M[i][j]==1) &&  (M[j][i]==1))
    203.             {
    204.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
    205.                 if(  (T_Coordonnees[i][1]>45)||(T_Coordonnees[j][1]>45)  )
    206.                 {
    207.                     painter.drawLine(((T_Coordonnees[i][0]+20)-10),(T_Coordonnees[i][1]),((T_Coordonnees[j][0]+20)-10),(T_Coordonnees[j][1]));
    208.                 }
    209.                 else
    210.                 {
    211.                     painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]+30),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]+30));
    212.                 }
    213.             }
    214.         }
    215.     }
    216.     ////////////////////////////////////////////////
    217.     Num_Sommet=0;
    218.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    219.     {
    220.         QPoint point = QPoint( (((T_Coordonnees[Num_Sommet][0])+15)), ((T_Coordonnees[Num_Sommet][1])+15) );
    221.         QString str;
    222.         str.setNum(Num_Sommet);
    223.         painter.drawText( point,str);
    224.  
    225.     }
    226. }
    227.  
    228. //main.cpp
    229. #include <QApplication>
    230. #include "FenPrincipale.h"
    231. int main(int argc, char* argv[])
    232. {
    233.     QApplication app(argc, argv);
    234.     FenPrincipale fenetre;
    235.     fenetre.show();
    236.     return app.exec();
    237. }
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    I would like to declare the array M as a global variable so that the class FenDessin can use it to make the drawing without the error:
    " M is not declared in this scope"
    Thank you for the attention given to this message.
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  2. 21st February 2012, 22:00 #2
    ChrisW67
    ChrisW67 is offline Guru
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    Default Re: An array as a common variable between two classes .

    If you want access to the data in the public FenPrincipale::M member variable in another class then you need one of these:
    • Pass a pointer (or reference as appropriate) to the FenPrincipale instance to the other class and access M through that
    • Supply the other class with a pointer (or reference) to the FenPrincipale::M member directly
    • Supply the other class with a copy of the FenPrincipale::M member

    which you choose is up to you and your requirements.

    This is 100% C++ knowledge, and nothing to do with Qt.
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  3. The following user says thank you to ChrisW67 for this useful post:

    hichemnho (25th February 2012)
  4. 25th February 2012, 17:00 #3
    hichemnho
    hichemnho is offline Novice
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    Default Re: An array as a common variable between two classes .

    Thank you for your response,
    As the title of the forum is saying I am a newbie, so can't you be more specific and give me a code of what you are suggesting?
    Thanks in advance!!!

    Added after 39 minutes:


    Hello,
    I've modified the code only the "FenDessin.h" and "FenDessin.cpp" but the program crashed.
    Qt Code: 
    1. //FenDessin.h
    2. #ifndef FENDESSIN_H
    3. #define FENDESSIN_H
    4. #include <QtGui>
    5. #include"FenPrincipale.h"
    6. class FenDessin : public QDialog
    7. {
    8. public:
    9.     FenDessin ( FenPrincipale* parent);
    10.  
    11.  
    12. private:
    13.     QPushButton *fermer;
    14.     QPainter *painter;
    15.     FenPrincipale * ref;
    16. private slots:
    17.     void paintEvent (QPaintEvent *);
    18. };
    19. #endif // FENDESSIN_H
    20.  
    21.  
    22.  
    23. //FenDessin.cpp
    24. #include "FenDessin.h"
    25.  
    26. FenDessin::FenDessin( FenPrincipale *parent) :QDialog(parent),ref(parent)
    27. {
    28.     fermer = new QPushButton("Fermer",this);
    30.     paintEvent(c);
    31.     connect(fermer, SIGNAL(clicked()), this, SLOT(accept()));
    32.  
    33. }
    34. void FenDessin::paintEvent(QPaintEvent *c)
    35. {
    36.     QPainter painter(this);
    37.  
    38.  
    39.     int  tour=0;
    40.     int x=10;
    41.     int y=10;
    42.     int Num_Sommet=0;
    43.     int T_Coordonnees [10][3];
    44.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    45.     {
    46.         (T_Coordonnees[Num_Sommet][0])=x;
    47.         (T_Coordonnees[Num_Sommet][1])=y;
    48.         (T_Coordonnees[Num_Sommet][2])=tour;
    49.  
    50.         if (tour==0)
    51.         {
    52.             x+=35;
    53.             tour=1;
    54.         }
    55.         else
    56.         {
    57.             y+=55;
    58.             tour=0;
    59.         }
    60.  
    61.     }
    62.  
    63.     int w1=0;
    64.     int w2=0;
    65.     int cpt=10;
    66.     Num_Sommet=0;
    67.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    68.     {
    69.         if ( (T_Coordonnees[Num_Sommet][2])==1)
    70.         {   if(w1==0)
    71.             {
    72.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+500) ;
    73.                 w1=1;
    74.             }
    75.             else
    76.             {
    77.                 if(w1==1)
    78.                 {
    79.                     (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+250+cpt) ;
    80.                     w1=0;
    81.                     cpt=cpt+15;
    82.                 }
    83.             }
    84.             if (Num_Sommet==9)
    85.             {
    86.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
    87.             }
    88.  
    89.         }
    90.         else
    91.         {
    92.             if(w2==0)
    93.             {
    94.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+200;
    95.                 w2=1;
    96.             }
    97.             else
    98.             {
    99.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+100+cpt;
    100.                 w2=0;
    101.                 cpt=cpt+15;
    102.             }
    103.  
    104.             if (Num_Sommet==4)
    105.             {
    106.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
    107.             }
    108.         }
    109.         painter.drawEllipse((T_Coordonnees[Num_Sommet][0]), (T_Coordonnees[Num_Sommet][1]), 30.0, 30.0);
    110.     }
    111.  
    112.     int i,j;
    113.     for (i=0; i<10; i++)
    114.     {
    115.         for (j=0; j<10; j++)
    116.         {
    117.             if ((ref->M[i][j])==1)
    118.             {
    119.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
    120.             }
    121.         }
    122.     }
    123.  
    124.  
    125.  
    126.     for (i=0; i<10; i++)
    127.     {
    128.         for (j=0; j<10; j++)
    129.         {
    130.             if ((ref->M[i][j]==1) &&  (ref->M[j][i]==1))
    131.             {
    132.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
    133.                 if(  (T_Coordonnees[i][1]>45)||(T_Coordonnees[j][1]>45)  )
    134.                 {
    135.                     painter.drawLine(((T_Coordonnees[i][0]+20)-10),(T_Coordonnees[i][1]),((T_Coordonnees[j][0]+20)-10),(T_Coordonnees[j][1]));
    136.                 }
    137.                 else
    138.                 {
    139.                     painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]+30),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]+30));
    140.                 }
    141.             }
    142.         }
    143.     }
    144.     ////////////////////////////////////////////////
    145.     Num_Sommet=0;
    146.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    147.     {
    148.         QPoint point = QPoint( (((T_Coordonnees[Num_Sommet][0])+15)), ((T_Coordonnees[Num_Sommet][1])+15) );
    149.         QString str;
    150.         str.setNum(Num_Sommet);
    151.         painter.drawText( point,str);
    152.  
    153.     }
    154. }
    To copy to clipboard, switch view to plain text mode 
    Thanks for the attention given to this message.

    Added after 43 minutes:


    Hello,
    Finally the code works.
    I 've modified the FenDessin.cpp and FenDessin.h
    Qt Code: 
    1. //FenDessin.h
    2. #ifndef FENDESSIN_H
    3. #define FENDESSIN_H
    4. #include <QtGui>
    5. #include"FenPrincipale.h"
    6. class FenDessin : public QDialog
    7. {
    8. public:
    9.     FenDessin ( FenPrincipale* parent);
    10.  
    11.  
    12. private:
    13.     QPushButton *fermer;
    14.     QPainter *painter;
    15.     FenPrincipale * ref;
    16. private slots:
    17.     void paintEvent (QPaintEvent *);
    18. };
    19. #endif // FENDESSIN_H
    20.  
    21.  
    22. //FenDessin.cpp
    23. #include "FenDessin.h"
    24.  
    25. FenDessin::FenDessin( FenPrincipale *parent) :QDialog(parent),ref(parent)
    26. {
    27.     fermer = new QPushButton("Fermer",this);
    29.     paintEvent(c);
    30.     connect(fermer, SIGNAL(clicked()), this, SLOT(accept()));
    31.  
    32. }
    33. void FenDessin::paintEvent(QPaintEvent *c)
    34. {
    35.     QPainter painter(this);
    36.  
    37.  
    38.     int  tour=0;
    39.     int x=10;
    40.     int y=10;
    41.     int Num_Sommet=0;
    42.     int T_Coordonnees [10][3];
    43.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    44.     {
    45.         (T_Coordonnees[Num_Sommet][0])=x;
    46.         (T_Coordonnees[Num_Sommet][1])=y;
    47.         (T_Coordonnees[Num_Sommet][2])=tour;
    48.  
    49.         if (tour==0)
    50.         {
    51.             x+=35;
    52.             tour=1;
    53.         }
    54.         else
    55.         {
    56.             y+=55;
    57.             tour=0;
    58.         }
    59.  
    60.     }
    61.  
    62.     int w1=0;
    63.     int w2=0;
    64.     int cpt=10;
    65.     Num_Sommet=0;
    66.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    67.     {
    68.         if ( (T_Coordonnees[Num_Sommet][2])==1)
    69.         {   if(w1==0)
    70.             {
    71.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+500) ;
    72.                 w1=1;
    73.             }
    74.             else
    75.             {
    76.                 if(w1==1)
    77.                 {
    78.                     (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+250+cpt) ;
    79.                     w1=0;
    80.                     cpt=cpt+15;
    81.                 }
    82.             }
    83.             if (Num_Sommet==9)
    84.             {
    85.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
    86.             }
    87.  
    88.         }
    89.         else
    90.         {
    91.             if(w2==0)
    92.             {
    93.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+200;
    94.                 w2=1;
    95.             }
    96.             else
    97.             {
    98.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+100+cpt;
    99.                 w2=0;
    100.                 cpt=cpt+15;
    101.             }
    102.  
    103.             if (Num_Sommet==4)
    104.             {
    105.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
    106.             }
    107.         }
    108.         painter.drawEllipse((T_Coordonnees[Num_Sommet][0]), (T_Coordonnees[Num_Sommet][1]), 30.0, 30.0);
    109.     }
    110.  
    111.     int i,j;
    112.     for (i=0; i<10; i++)
    113.     {
    114.         for (j=0; j<10; j++)
    115.         {
    116.             if ((ref->M[i][j])==1)
    117.             {
    118.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
    119.             }
    120.         }
    121.     }
    122.  
    123.  
    124.  
    125.     for (i=0; i<10; i++)
    126.     {
    127.         for (j=0; j<10; j++)
    128.         {
    129.             if ((ref->M[i][j]==1) &&  (ref->M[j][i]==1))
    130.             {
    131.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
    132.                 if(  (T_Coordonnees[i][1]>45)||(T_Coordonnees[j][1]>45)  )
    133.                 {
    134.                     painter.drawLine(((T_Coordonnees[i][0]+20)-10),(T_Coordonnees[i][1]),((T_Coordonnees[j][0]+20)-10),(T_Coordonnees[j][1]));
    135.                 }
    136.                 else
    137.                 {
    138.                     painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]+30),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]+30));
    139.                 }
    140.             }
    141.         }
    142.     }
    143.     ////////////////////////////////////////////////
    144.     Num_Sommet=0;
    145.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
    146.     {
    147.         QPoint point = QPoint( (((T_Coordonnees[Num_Sommet][0])+15)), ((T_Coordonnees[Num_Sommet][1])+15) );
    148.         QString str;
    149.         str.setNum(Num_Sommet);
    150.         painter.drawText( point,str);
    151.  
    152.     }
    153. }
    To copy to clipboard, switch view to plain text mode 
    Thank you very much.
    Last edited by hichemnho; 25th February 2012 at 17:00.
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  5. 25th February 2012, 22:25 #4
    ChrisW67
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    Default Re: An array as a common variable between two classes .

    [quote]As the title of the forum is saying I am a newbie, so can't you be more specific and give me a code of what you are suggesting?[/code]

    More examples:
    Quote Originally Posted by me
    Pass a pointer (or reference as appropriate) to the FenPrincipale instance to the other class and access M through that
    Qt Code: 
    1. class A {
    2. public:
    3.   A() { memberVar = 1; }
    4.   int memberVar;
    5. };
    6.  
    7. class B {
    8. public:
    9.   B(): myData(7) { }
    10.  
    11.   void doStuff(A *a) {
    12.     qDebug() << myData * a->memberVar;
    13.   }
    14.  
    15.   void doStuff(const A &a) {
    16.     qDebug() << myData * a.memberVar;
    17.   }
    18.  
    19. private:
    20.   int myData;
    21. };
    To copy to clipboard, switch view to plain text mode 

    Quote Originally Posted by me
    Supply the other class with a pointer (or reference) to the FenPrincipale::M member directly
    Qt Code: 
    1. class A {
    2. public:
    3.   A() { memberVar = 1; }
    4.   int memberVar;
    5. };
    6.  
    7. class B {
    8. public:
    9.   B(): myData(7) { }
    10.  
    11.   void doStuff(int *aMemberVar) {
    12.     qDebug() << myData + *aMemberVar;
    13.   }
    14.  
    15.   void doStuff(int &aMemberVar) {
    16.     qDebug() << myData + aMemberVar;
    17.   }
    18.  
    19. private:
    20.   int myData;
    21. };
    To copy to clipboard, switch view to plain text mode 
    Quote Originally Posted by me
    Supply the other class with a copy of the FenPrincipale::M member
    Qt Code: 
    1. class A {
    2. public:
    3.   A() { memberVar = 1; }
    4.   int memberVar;
    5. };
    6.  
    7. class B {
    8. public:
    9.   B(): myData(7) { }
    10.  
    11.   void doStuff(int aMemberVarCopy) {
    12.     qDebug() << myData - aMemberVarCopy;
    13.   }
    14.  
    15. private:
    16.   int myData;
    17. };
    To copy to clipboard, switch view to plain text mode 
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