Retrieve QByteArray in .png from SQL database

[sam123]

hello

I have stored image in arraybyte in database and I am also able to run a query to retrieve arraybyte in QPixmap and displaying on QLable.

I want to retrieve the same arraybyte from database but this time I have to store that file in automatic generated folder (Any name) with the format of PNG.

What classes I can use to generate folder for storing my image file ?

How to save the QPixmap in any folder or directory ?

QPixmap::save()

QPixmap::save()

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just gives boolean value...but does it save file in a specific location?

Looking for your guidance..

Thanks in advance...

[Lesiok]

Simply use correct variant of method QPixmap::save.

[anda_skoa]

Which format do you get the date in when you query the database?

If it is PNG already you could just write the data directly into a file.

If you need to decode it first, e.g. if it is saved in a different format in the database, then use QImage for loading/saving if you don't need to display it.
(saves two conversions between QImage and QPixmap)

Cheers,
_

[sam123]

my image data is in bytes only. I am trying to save byte data using QPixmap::save in specific directory but I am not getting any png file in that specific folder.

---

Added after 8 minutes:

code for saving byte image in specific folder.

QPixmap pix ("C:/Folder");
QByteArray bytes = dataFromDatabase;   //It is a byteArray data
QBuffer buf(&bytes);
buf.open(QIODevice::WriteOnly);
pix.save(&buf, "PNG");

QPixmap pix ("C:/Folder");
QByteArray bytes = dataFromDatabase;   //It is a byteArray data
QBuffer buf(&bytes);
buf.open(QIODevice::WriteOnly);
pix.save(&buf, "PNG");

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I used this code to save png file in folder but after running this code I am not getting any file in that folder.

[anda_skoa]

my image data is in bytes only

You mean like 32-bit ARGB or similar?

I used this code to save png file in folder but after running this code I am not getting any file in that folder.

If you want to save to a png file, why do you write into the buffer?

Cheers,
_

[sam123]

yes its similar, what would be the correct method to save png in specific folder. Could you please suggest me.

[anda_skoa]

Either use QFile instead of the buffer or just use the save() overload that takes a filename.

Cheers,
_

P.S.: as I said before, if you don't need to display the image use QImage instead of forcing two QImage<->QPixmap conversions

[Lesiok]

From line 1 of code : You try to work with QPixmap from file Folder in main directory of disk C:. Is this what You want ? I don't think so.