Problem with converting a QSettings value to QString

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This is my code:

fileName = QFileDialog::getOpenFileName(this, tr("Open Image File"), QDir::currentPath());//QString
settings = new QSettings("Something", "Some Thing");//QSettings
settings->setValue("lastimage", fileName);

fileName = QFileDialog::getOpenFileName(this, tr("Open Image File"), QDir::currentPath());//QString
settings = new QSettings("Something", "Some Thing");//QSettings
settings->setValue("lastimage", fileName);

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The value appears in the Windows registry as it should be, but when i try to convert it back to QString it returns an empty string (the value field in the registry key is empty).
Is there something wrong with this code:

fileName = settings->value("lastimage").toString();

fileName = settings->value("lastimage").toString();

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or do I have to do something else ?