Replace image with new QPixmap in QFile

[Engelard]

I have a QFile which is .jpg image, and it is part of App resources. How can i replace it's image with completely new? New image have a different resolution, but also .jpg.

I tried this:

QFile myFile(resourcePath);
QPixmap myPix = QPixmap::fromImage(QImage(resourcePathNew));
myFile.open(QIODevice::WriteOnly);
if(!myPix.save(&myFile)) ui->textEdit->append("Pixmap load failed");

QPixmap::save() is failing, something wrong, and i don't understand what exactly. Any advice will be appreciated.

[JonB]

@Engelard
You seem to be trying to write back into a Qt resource path? Resources are read-only assets embedded in your code, you cannot "replace" them. Unless @Christian-Ehrlicher tells me otherwise?

[Christian Ehrlicher]

@Engelard said in Replace image with new QPixmap in QFile:

Any advice will be appreciated.

check the return values of the functions you call (c basics) and if the pixmap is valid.

[JonB]

@Engelard
You seem to be trying to write back into a Qt resource path? Resources are read-only assets embedded in your code, you cannot "replace" them. Unless @Christian-Ehrlicher tells me otherwise?

[Pablo J. Rogina]

@Engelard said in Replace image with new QPixmap in QFile:

Any advice will be appreciated.

You may need to understand what the Qt resource system is all about.
I already suggested the same documentation in your other post related to this same topic.

[Engelard]

@JonB said in Replace image with new QPixmap in QFile:

Resources are read-only assets embedded in your code

oh..

[JonB]

@Engelard
:) I had forgotten it's you, @Pablo-J-Rogina has reminded me!

It's the same issue as before. If you want to be able to replace a "resource" at runtime with a different file, you may be better supplying the file as an external file.

[Christian Ehrlicher]

@JonB said in Replace image with new QPixmap in QFile:

Unless @Christian-Ehrlicher tells me otherwise?

No you're right and when he @Engelard would have checked the return value of open() he would already found out it by himself...

[JonB]

@Christian-Ehrlicher
He already did! :)

if(!myPix.save(&myFile)) ui->textEdit->append("Pixmap load failed");

Well, he should have checked the open() first, I agree.

But I think his real issue was he didn't know why it was failing :)