Saving image fails on other machines

[27Loco]

Hello,

I already added the plugins qgif4.dll, qjpeg4.dll and qtiff4.dll and called in the main method QApplication::addLibraryPath. The application now successfully loads images and tells me that the following formats are supported.

bmp, jpeg, jpg, png, ppm, tif, tiff, xbm, xpm

But saving works only on my development machine. This is what I am doing in order to save an image:

QPainter *painter = new QPainter();
QRectF rect = scene->itemsBoundingRect();
 
QImage *image = new QImage(rect.size().toSize(), QImage::Format_ARGB32_Premultiplied);
 
painter->begin(image);
scene->render(painter);
painter->end();
 
image->save("test.jpg", "JPG");
 
delete painter;
delete image;

QPainter *painter = new QPainter();
QRectF rect = scene->itemsBoundingRect();

QImage *image = new QImage(rect.size().toSize(), QImage::Format_ARGB32_Premultiplied);

painter->begin(image);
scene->render(painter);
painter->end();

image->save("test.jpg", "JPG");

delete painter;
delete image;

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What am I doing wrong?

Thanks for your support.

[Lykurg]

Have you tried to save it with PNG or any other format? If that works, you have done something wrong with the plugins. Normally you don't need to call addLibrary.

[27Loco]

I already tried png, bmp and jpg, but none of them works on other machines, only on my development pc.

Loading images worked after using the plugins so I guess the plugins work well.

[grabalon]

Try removing the format from the save call, and letting Qt figure it out on its own:

image->save("test.jpg");

image->save("test.jpg");

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[27Loco]

Doesnt work either.

I activated the console and now I got some more information about the problem. This is what I get when I am trying to save the image.

QPainter::begin: Paint device returned engine == 0, type: 3; 
QPainter::save: Painter not active 
QPainter::setClipRect: Painter not active 
QPainter::restore: Unbelanced save/restore 
. 
. 
. 
.
QPainter::end: Painter not active, aborted

QPainter::begin: Paint device returned engine == 0, type: 3; 
QPainter::save: Painter not active 
QPainter::setClipRect: Painter not active 
QPainter::restore: Unbelanced save/restore 
. 
. 
. 
.
QPainter::end: Painter not active, aborted

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SOLVED
rect.size().toSize() was the problem. The size was not valid and therefore the image was invalid. So many hours

Thanks for your help