QImage::save() doesn't get the raw bytes of the image, it converts the image to a file format. If you really want the raw bytes, do something like QByteArray ba((const char *)preview.constBits(), preview.byteCount());

Okay, I have solved the problem with a workaround: In the code for my development board I added a new line character after every value. Then, in my Qt code I check every time the SLOT is called if the value does have a new line char. Either the value is saved in another variable until it receives a value with a new line character or it is output immediately (if it has a new line character). static QString newValue= ""; void MainWindow::updateData(const QLowEnergyCharacteristic &c,const QByteArray &value) { newValue = newValue + (QString)value; if (newValue.contains("\n") || newValue.contains("\r")){ ui->dataList->addItem(newValue.simplified()); ui->dataList->scrollToBottom(); newValue = ""; } }

@jsulm we make an installation file for our combined system, including multiple programs sharing some but not other resources. we use an nsi script to manage this. usually works fine. I just missed updating some of the .dll files.

@JNBarchan thank you for the detailed answer.

Like @SGaist said. But QByteArray takes a string constant. I am using it is code right now. Extensively.