How to using GIF image for QT ?

JonB

I do not know for sure that GIF should appear in supportedImageFormats(), though I agree I would have thought it should.
I suggested earlier that you try to display a GIF as an image on a QLabel, not in a QMovie.
@Christian-Ehrlicher asked you to verify that the path to the GIF file you test really does exist via QFile::exists().

Nguyen Thang Phong

@Christian-Ehrlicher @JonB

I tried add to pixmap

JonB

@Nguyen-Thang-Phong
I do not use resources and I do not know whether that ../..../additonal.qrc path is right.
What does QFile::exists(":/loading.gif") return?
If you place a .gif file in your actual file system and try

qDebug() << QFile::exists("c:/full/path/to/file.gif");
// `label` is some `QLabel *` you have created and is visible in your UI
label->setPixmap(new QPixmap("c:/full/path/to/file.gif"));

(I think the above is right, untested, adjust as necessary) does that work?

Otherwise I guess it is indeed a "static" issue, and only someone like @Christian-Ehrlicher knows what the issue might be.

JoeCFD

@JonB I play a GIF file in a QMovie in a QLabel.

JoeCFD

@Nguyen-Thang-Phong Did you try the following in the pro file?

CONFIG   += static
# For static plugins
static {
    # Include the GIF plugin
    QTPLUGIN += qgif
}

JonB

@JoeCFD said in How to using GIF image for QT ?:

@JonB I play a GIF file in a QMovie in a QLabel.

I know you do. And I have suggested removing the QMovie level, to eliminate that, by assigning a created QPixmap from a GIF file directly to the QLabel, which can display GIF images, to see if that works. And I have also suggested using an external, actual GIF file instead of one in a Qt resource, and various QFile::exists() checks to verify the file or resource can be found. Up to you whether you do these things, but they check for various problems. It may well be that your issue is static-related and these will not show anything wrong, but it is what I would do before proceeding.

JoeCFD

@JonB It is not a QMovie issue. May be better to try to make his code to run dynamically with gif plugin first. And then build his app with gif plugin statically.

JonB

@JoeCFD
I understand, but was trying to simplify, and follow @Christian-Ehrlicher's suggestion of checking file exists and removing resources from OP's situation, as I don't know what he actually has there/where.

If you are happy to take over here that's fine :) If the fact that the OP's supportedImageFormats() does not include GIF indicates that is where the problem lies then obviously all my questions are not relevant.

Nguyen Thang Phong

@JoeCFD
Thank you, I will try

Nguyen Thang Phong

@Christian-Ehrlicher @JonB @JoeCFD
I have tried the solution, but not GIF image format to work.