Last working directory

mainwindow.cpp

void MainWindow::slotChannelsUploadFile(bool /*checked =false */)
{
    int channelid = m_filesmodel->getChannelID();
    if(channelid>0)
    {
        QString filename = QFileDialog::getOpenFileName(this, tr("Open File"),
            ttSettings->value(SETTINGS_GENERAL_LAST_DIR, QDir::homePath()).toString()
            /*, tr("All Files (*.*)")*/);
        if (filename.isEmpty()) {
            return;
        }
        ttSettings->setValue(SETTINGS_GENERAL_LAST_DIR, QFileInfo(filename).absolutePath());
        QStringList files;
        files.push_back(filename);
        slotUploadFiles(files);
    }
}

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void MainWindow::slotChannelsDownloadFile(bool /*checked =false */)
{
    int fileid = (int)ui.filesView->currentIndex().internalId();
    int channelid = m_filesmodel->getChannelID();
    FileInfo fileinfo;
    if(fileid>0 && channelid>0 && 
       TT_GetChannelFileInfo(ttInst, channelid, fileid, &fileinfo))
    {
        QDir lastDir(ttSettings->value(SETTINGS_GENERAL_LAST_DIR, QDir::homePath()).toString());
        QString filename = QFileDialog::getSaveFileName(this, tr("Save File"),
                           lastDir.filePath(_Q(fileinfo.szFileName))
                           /*, tr("All Files (*.*)")*/);
        if (filename.isEmpty()) {
            return;
        }
        filename = lastDir.toNativeSeparators(filename);
        ttSettings->setValue(SETTINGS_GENERAL_LAST_DIR, QFileInfo(filename).absolutePath());
        if (!TT_DoRecvFile(ttInst, channelid, fileid, _W(filename))) {
            QMessageBox::critical(this, MENUTEXT(ui.actionDownloadFile->text()),
                                  tr("Failed to download file %1").arg(filename));
        }
    }
}

preferencesdlg.h

#define SETTINGS_GENERAL_LAST_DIR                   "general/last-dir"