label->setpixmap() problem with displaying

fourfeeter

Hello, I have simple code:

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    przycisk1=0;
    przycisk2=0;

    QPixmap zielony("C:/Qt-projekty/arduinors232/zielony.png");
   QPixmap czerwony("C:/Qt-projekty/arduinors232/czerwony.png");

     ui->label_3->setPixmap(czerwony);
    ui->label_4->setPixmap(czerwony);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{


    if(przycisk1)
    {
        ui->label_3->setPixmap(czerwony);
 
        przycisk1=0;
        ui->pushButton->setText("Włącz");

    }
    else
    {

        ui->label_3->setPixmap(zielony);
           ui->pushButton->setText("Wyłącz");
        przycisk1=1;

    };



}

In constructor I give value of variable type QPixmap. In next I am using function setPixmap(), I display picture. It working good. The problem is in function on_pushButton_clicked(). A can't display the picture. What is interesting, when I whill modify this code and Qpixmap give value of variable in function on_pushButton_clicked(), everything is working? Where is problem?

PS.
Sorry of my engilsh.

mrjj

@fourfeeter
Hi
In constructor, you have the pixmaps as local variables
QPixmap zielony("C:/Qt-projekty/arduinors232/zielony.png"); <<< local . Cannot be seen outside constructor
QPixmap czerwony("C:/Qt-projekty/arduinors232/czerwony.png"); <<< local

so I guess in
void MainWindow::on_pushButton_clicked() {
ui->label_3->setPixmap(czerwony); <<<< that is other one. Not the one from constructor ?

So I guess you mean
zielony.load("C:/Qt-projekty/arduinors232/zielony.png");
czerwony.load("C:/Qt-projekty/arduinors232/czerwony.png");

if zielony and czerwony are defined in .h ( the class)

fourfeeter

OK. This was a problem. Now it works. Thanks for the help.