how to get single string from qstringlist - c++

Question

I am building an image viewer application. I store all image path into qSringlist. Now I need to get one image path every time. How can i do this ?
Here is my code
void MainWindow::on_btn_Next_clicked()
{
//initial value
int count = 0;
do {
//show image into label
QImage img(fileName.at(count));
ui->lbl_Image->setPixmap(QPixmap::fromImage(img));
qDebug() << fileName.at(count);
count++;
return;
} while (count < fileName.size());
}

Answer 1

initialize count outside your on_btn_Next_clicked() method and then every time the method is called increment the counter, when the counter is the same size of the QStringList reset it back to 0
// initialize count outside the method
int count = 0;
void MainWindow::on_btn_Next_clicked()
{
if(count <= filename.size()) {
//show image into label
QImage img(fileName.at(count));
ui->lbl_Image->setPixmap(QPixmap::fromImage(img));
qDebug() << fileName.at(count);
this->count++;
return;
} else {
//reset the counter back to 0
this->count = 0;
}
}

Answer 2

First get the filename:
const QStringList fileNames = QFileDialog::getOpenFileNames(this, tr("Open File"), QDir::currentPath());
Use a foreach loop to iterate:
foreach(const QString& image, fileNames){
ui->lbl_Image->setPixmap(QPixmap::fromImage(QImage(image)));
qDebug() << "Get this filename: " << image;
}

Answer 3

All previous answers are correct on how to get a specific item from the list, even the question's code does that correctly.
However all fail to mention that this will always show the last image in the list, since the UI never gets a chance to display any of the others.
The loop is never returning to the event loop, thus never allowing the application to process the label's update() request.