Image From Memory to QLabel as Pixmap

[R_Irudezu]

Hi, i have two variables :

uint8_t jpegData 
//and 
uint32_t jpegDataLen

When i want to write a jpeg file under a directory, i am using these two variables that coming from an external DLL. And i got the JPEG file correctly.

But when i try to show this jpeg data from memory, program getting crashed. Here's what i am doing:

first try:

QImage image;
image.loadFromData((char *)array[i].jpegMugData, array[i].jpegMugDataLen, "JPG");
ui->imageLabel->setPixmap(QPixmap::fromImage(image));

second try:

QBuffer buffer;
QDataStream in(&buffer);
QImage image;

buffer.setData((char*)array[i].jpegMugData, array[i].jpegMugDataLen);
buffer.open(QBuffer::ReadOnly);
in >> image;
ui->imageLabel->setPixmap(QPixmap::fromImage(image));

both ways causes to program crash. Like i said when i used these two variables to write jpeg file under a directory there is no problem. What should i do? What am i missing?

[VRonin]

@R_Irudezu said in Image From Memory to QLabel as Pixmap:

uint8_t jpegData

This is a single byte. If jpegDataLen>1 it's normal for it to crash.
You need to allocate the buffer beforehand. QByteArray helps in these cases

[R_Irudezu]

@VRonin Yes you're right. I did some minor changes on code and it's now being allocating and there is no crash. But still nothing to display over imageLabel. I suppose because of jpg decoding. How to handle it....

Edit: it's ok now.