How to open a specific directory with QFileDialog in QT - c++

Question

I wanted to open QFileDialog for a specific path like //DC1/C$/Users/ but when QFileDialog opens it goes to a default path. When QFileDialog opens, I can change directory to the UNC path but I wanted to open this path as default. How can I do that? In the following code, g_absolutePath has been initialized with //DC1/C$/Users/ but it doesn't work.
#include "uploadfm.h"
#include "ui_uploadfm.h"
#include "mainwindow.h"
UploadFM::UploadFM(QWidget *parent) : QMainWindow(parent), ui(new Ui::UploadFM)
{
ui->setupUi(this);
QWidget::setFixedSize(600, 175);
}
UploadFM::~UploadFM()
{
delete ui;
}
void UploadFM::on_pushButtonSource_clicked()
{
QString fileName = QFileDialog::getOpenFileName(this, "Choose File", g_absolutePath);
if(fileName.isEmpty())
return;
ui->lineEditSourcePath->setText(fileName);
}
void UploadFM::on_pushButtonDestination_clicked()
{
QString fileName = QFileDialog::getExistingDirectory(this, "Choose Folder", g_absolutePath);
if(fileName.isEmpty())
return;
ui->lineEditDestinationPath->setText(fileName);
}
void UploadFM::on_pushButtonUpload_clicked()
{
QString l_sourceFileName = ui->lineEditSourcePath->text();
QString l_destinationFileName = ui->lineEditDestinationPath->text();
if(l_sourceFileName.isEmpty() || l_destinationFileName.isEmpty())
return;
QFile file(l_sourceFileName);
if(file.copy(l_destinationFileName))
{
statusBar()->showMessage("Upload has been Successful ... ");
}
else
{
statusBar()->showMessage("Upload has failed ...");
}
}

Answer 1

The Qt Documentation documents how to do this :
void UploadFM::on_pushButtonDestination_clicked()
{
const QString defaultPath = "//DC1/blabla...";
QString fileName = QFileDialog::getExistingDirectory(this, "Choose Folder", g_absolutePath, defaultPath);
...
}