Convert Qstring to QPixmap

[Gillou_beginqt]

Hello,
I am working on project where I have to display image saved in my database into different scene using QGraphicScene. The images are query in string but I am not able to display them in the different scene.

[pmh4514]

what have you tried already?
You will not be "converting" a QString to QPixmap, rather, you have to drawText(..) to it.

[Gillou_beginqt]

I tried to used a qvariant variable to convert. But It's not working. Maybe the syntax was wrong
Can you elaborate about drawText().

[SGaist]

Hi,

@pmh4514 @Gillou_beginqt means that he has full images saved in his database, not that he wants to draw text coming from his database.

@Gillou_beginqt how did you save these images ? What format to they have ?

[Gillou_beginqt]

@SGaist
@@
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly)) return;
QString img_id,img_name;
img_id=ui->imgId->text();
int id=img_id.toInt();
img_name=ui->imgName->text();
QByteArray byteArray = file.readAll();

QSqlQuery query;
query.prepare("INSERT INTO images(image_id,image_name,images) VALUES (?,?,?)");

query.addBindValue(id);
query.addBindValue(img_name);
 query.addBindValue(byteArray);
query.exec();

@@
This is the code I used to saved the images in my database. They are in QBytearray

[c.savur]

Hello,

when you save the image to database, save as unsigned char and save size of the image then you can generate image by following :

QImage(const uchar * data, int width, int height, Format format);

then you can convert the QPixmap

QPixmap pixmap = QPixmap::fromImage(img);

After you have Qpixmap you can add to scene by using QGraphicsPixmapItem.

Qimage Doc. t

[Gillou_beginqt]

How to save as unsigned char and save the size of the image

[SGaist]

How are you constructing the image from the database ?

[Gillou_beginqt]

@SGaist I was planning to use the code of the drill down example but I am not able to display the pictures from my database

[SGaist]

Does the Drill Down Example work correctly for you ?