why isnt my button showing?

[IsleWitch]

Hi,

Im trying to create a A GUI.
In my main, im trying to create the "QUIT" button, but it wont show when i run it. I would appreaciate if anyone would tell me why it wont show.


Here is my code:

#include <QApplication>
#include <QPushButton>
#include <QWidget>

#include "browseimages.h"


class MyWidget : public QWidget
{
public:
MyWidget(QWidget *parent = 0);
};

MyWidget::MyWidget(QWidget *parent)
: QWidget(parent)
{
QPushButton *b_quit = new QPushButton(tr("Quit"), this);

connect(b_quit, SIGNAL(clicked()), qApp, SLOT(b_quit()));

}


int main(int argc, char **argv)
{
QApplication app(argc, argv);
BrowseImages window;

window.show();
return app.exec();
}

Thank you.

[marcel]

Where are you creating/showing an instance of MyWidget?

Also b_quit will not look good. You could add it to a layout to handle its position and size.

[IsleWitch]

Thanks Marcel,

I forgot to creat an instance of MyWidget. I fixed that, and i also used layout to handle the position and size of my quit button.

But, my "quit" button (b_quit) isnt working. The window wont close when i press "Quit". I would like to know where is the problem.

Here is the fixed code:

#include <QApplication>
#include "browseimages.h"
 
 
#include <QPushButton>
 #include <QWidget>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <Qlabel>
 
 
class MyWidget : public QWidget
 {
 public:
     MyWidget(QWidget *parent = 0);
 };
 
 MyWidget::MyWidget(QWidget *parent)
     : QWidget(parent)
 {
 
      QPushButton *b_quit = new QPushButton(tr("Quit"));
      QPushButton *b_search = new QPushButton(tr("Search"));
 
    connect(b_quit, SIGNAL(clicked()), qApp, SLOT(b_quit()));
 
    b_search->setFixedHeight(40);
    b_quit->setFixedHeight(40);
 
    QVBoxLayout *v_search = new QVBoxLayout;
    v_search->setAlignment(Qt::AlignCenter);
    QLabel *l_search_img = new QLabel();
    l_search_img->setPixmap(QPixmap("images/manual.png"));
    v_search->addWidget(l_search_img);
    v_search->addWidget(b_search);
 
   QHBoxLayout *h_quit = new QHBoxLayout;
   h_quit->addStretch();
   h_quit->addWidget(b_quit);
   h_quit->addStretch();
 
   QVBoxLayout *layout_vert = new QVBoxLayout;
 
 
   QHBoxLayout *layout_mid = new QHBoxLayout;
   layout_mid->addLayout(v_search);
 
   layout_vert->addLayout(layout_mid);
 
   layout_vert->addSpacing(30);
 
   QHBoxLayout *h_search = new QHBoxLayout;
   layout_vert->addLayout(h_search);
   layout_vert->addLayout(h_quit);
 
   layout_vert->addSpacing(30);
   this->setLayout(layout_vert);
}
 
 
int main(int argc, char **argv)
{
        QApplication app(argc, argv);
         MyWidget widget;
 
        widget.show();
        return app.exec();
}

#include <QApplication>
#include "browseimages.h"


#include <QPushButton>
 #include <QWidget>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <Qlabel>


class MyWidget : public QWidget
 {
 public:
     MyWidget(QWidget *parent = 0);
 };

 MyWidget::MyWidget(QWidget *parent)
     : QWidget(parent)
 {
     
      QPushButton *b_quit = new QPushButton(tr("Quit"));
      QPushButton *b_search = new QPushButton(tr("Search"));

    connect(b_quit, SIGNAL(clicked()), qApp, SLOT(b_quit()));
   
    b_search->setFixedHeight(40);
    b_quit->setFixedHeight(40);
	
    QVBoxLayout *v_search = new QVBoxLayout;
    v_search->setAlignment(Qt::AlignCenter);
    QLabel *l_search_img = new QLabel();
    l_search_img->setPixmap(QPixmap("images/manual.png"));
    v_search->addWidget(l_search_img);
    v_search->addWidget(b_search);
   
   QHBoxLayout *h_quit = new QHBoxLayout;
   h_quit->addStretch();
   h_quit->addWidget(b_quit);
   h_quit->addStretch();

   QVBoxLayout *layout_vert = new QVBoxLayout;


   QHBoxLayout *layout_mid = new QHBoxLayout;
   layout_mid->addLayout(v_search);

   layout_vert->addLayout(layout_mid);
	
   layout_vert->addSpacing(30);
   
   QHBoxLayout *h_search = new QHBoxLayout;
   layout_vert->addLayout(h_search);
   layout_vert->addLayout(h_quit);
	
   layout_vert->addSpacing(30);
   this->setLayout(layout_vert);
}


int main(int argc, char **argv)
{
        QApplication app(argc, argv);
         MyWidget widget;

        widget.show();
        return app.exec();
}

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Thanks in advance,

[marcel]

Your connect is wrong. Should be:

connect(b_quit, SIGNAL(clicked()), qApp, SLOT(quit()));

connect(b_quit, SIGNAL(clicked()), qApp, SLOT(quit()));

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[IsleWitch]

Your connect is wrong. Should be:

connect(b_quit, SIGNAL(clicked()), qApp, SLOT(quit()));

connect(b_quit, SIGNAL(clicked()), qApp, SLOT(quit()));

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Thank you what a silly mistake