Dynamic number of QLabel

[Lykurg]

void CMainWindow::displayDongleData() {
	QGridLayout *dongleLayout = new QGridLayout;

void CMainWindow::displayDongleData() {
	QGridLayout *dongleLayout = new QGridLayout;

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QGridLayout *dongleLayout = new QGridLayout(this);

QGridLayout *dongleLayout = new QGridLayout(this);

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and is CMainWindow shown? What is CMainWindow? have you called "app.exec()" in main?

int x = 0;
 
	for (int i; i<plainDongle->DNG_Memmory/4; i++) {
		dongleDataLabel[i]->setText(tr("Value "+i));
		dongleLayout->addWidget(dongleDataLabel[i], x, 0);
		dongleLayout->addWidget(dongleDataLineEdit[i], x, 1);
		x++;
	}
}

int x = 0;

	for (int i; i<plainDongle->DNG_Memmory/4; i++) {
		dongleDataLabel[i]->setText(tr("Value "+i));
		dongleLayout->addWidget(dongleDataLabel[i], x, 0);
		dongleLayout->addWidget(dongleDataLineEdit[i], x, 1);
		x++;
	}
}

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You don't need "int x" just use "i". And better use "i<dongleDataLabel.size()"

EDIT: once you have "dongleDataLabel." and once "dongleDataLabel->"? but that must result in an compiler error...