make a .jpg or .bmp picture into a widget...?

[JimDaniel]

Yes, there are a few problems. QPixmap has no on-screen representation. It is purely used for holding and manipulating an image file. Also, when you create a pixmap like this,

QPixmap pixmap("c:/my_image.png");

or

QPixmap pixmap;
pixmap.load("c:/my_image.png");

It only has local scope, when the function where its declared ends, the pixmap is destroyed, which does you no good for your intention, besides the fact that a QPixmap is the wrong object to create. That is why you use (class-scope) pointers to objects created on the heap with "new". (See my example below)

To accomplish what you want to do here, you need to use a QLabel. Something like this should get you started.

#ifndef _BLINKING_ICON_
#define _BLINKING_ICON_
 
#include <QWidget>
#include <QLabel>
 
class BlinkingIcon : public QWidget
{
       Q_OBJECT
 
    public:
         BlinkingIcon(QWidget * parent = 0);
         virtual ~BlinkingIcon();
 
    private:
        QLabel * display_image;
}
 
#endif
 
BlinkingIcon::BlinkingIcon(QWidget * parent) : QWidget(parent)
{
    this->setWindowTitle(tr("My Blinking Icon"));
    this->resize(200, 200);
 
   display_image = new QLabel(this);
   display_image->setPixmap(QPixmap("c:/my_image.png"));
   display_image->adjustSize();
}
 
BlinkingIcon::~BlinkingIcon(){}

#ifndef _BLINKING_ICON_
#define _BLINKING_ICON_

#include <QWidget>
#include <QLabel>

class BlinkingIcon : public QWidget
{
       Q_OBJECT

    public:
         BlinkingIcon(QWidget * parent = 0);
         virtual ~BlinkingIcon();

    private:
        QLabel * display_image;
}

#endif

BlinkingIcon::BlinkingIcon(QWidget * parent) : QWidget(parent)
{
    this->setWindowTitle(tr("My Blinking Icon"));
    this->resize(200, 200);

   display_image = new QLabel(this);
   display_image->setPixmap(QPixmap("c:/my_image.png"));
   display_image->adjustSize();
}

BlinkingIcon::~BlinkingIcon(){}

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For your purposes, you'll probably also want to research QLayouts...