Displaying image using label in Qt4.7

jk_mk

Hello,

I am a beginner in developing with Qt and I am trying to create my first application. I want to create a window with a button and a label, in order to use a pixmap and finally display an image on the label. When I run my project I do not get any errors, but I do not see my image in my form either. I hope someone could help me and give me a solution. I have created the following code.

Thanks in advance

/////////// open_image.h /////////////
@
#ifndef OPEN_IMAGE_H
#define OPEN_IMAGE_H

#include <QtGui/QMainWindow>
#include "ui_open_image.h"

class open_image : public QMainWindow, private Ui::open_imageClass
{
Q_OBJECT

public:
open_image(QWidget *parent = 0, Qt::WFlags flags = 0);
~open_image();

private:
Ui::open_imageClass ui;

private slots:
void doThingA(void);
};

#endif // OPEN_IMAGE_H
@

////////////// open_image.cpp ////
@
#include "open_image.h"

open_image::open_image(QWidget *parent, Qt::WFlags flags)
: QMainWindow(parent, flags)
{
setupUi(this);
QObject::connect(button, SIGNAL(triggered()), this, SLOT(doThingA()));
}

open_image::~open_image()
{

}

void open_image::doThingA(void)
{

label->setPixmap(QPixmap(":/open_image/C:/Users/manolis/Desktop/data/test.png", 0, Qt::AutoColor));

}
@

/////////// main.cpp //////
@
#include "open_image.h"
#include <QtGui/QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
open_image w;
w.show();
return a.exec();
}
@

[Mark up code, Tobias]

tobias.hunger

The path in line 18 of open_image.cpp looks very fishy to me.

jk_mk

What do you mean? I also tested the followings but with no results again. Do you thing it is a too long directory? Or there is a syntax error?

label->setPixmap(QPixmap(":/Users/manolis/Desktop/data/test.png", 0, Qt::AutoColor));

label->setPixmap(QPixmap(":/open_image/C:/Users/manolis/Desktop/data/test.png"));

label->setPixmap(QPixmap("C:/open_image/C:/Users/manolis/Desktop/data/test.png", 0, Qt::AutoColor));

giesbert

Hi jk_mk,

where is your image located? it it's in the resources, use the ":/xxx" notation, it it's in the file system, use the path without that, like here:

@
label->setPixmap(QPixmap(“C:/Users/manolis/Desktop/data/test.png”, 0, Qt::AutoColor));
@

jk_mk

It is in the resources (.qrc file), with URL, :/open_image/C:/Users/manolis/Desktop/data/test.png.
I have typed this

label->setPixmap(QPixmap(":/open_image/C:/Users/manolis/Desktop/data/test.png", 0, Qt::AutoColor));

label->setPixmap(QPixmap("C:/Users/manolis/Desktop/data/test.png", 0, Qt::AutoColor));

label->setPixmap(QPixmap(":/C:/Users/manolis/Desktop/data/test.png", 0, Qt::AutoColor));

label->setPixmap(QPixmap(":/Users/manolis/Desktop/data/test.png", 0, Qt::AutoColor));

but I did not get anything

jk_mk

Thanks for yours response. I just found my mistake. I should have put clicked() instead of triggered().

Thanks a lot