Unable to load gif file in QImage

[spsingh]

I am using Qt 4.5 (on VS 2008) which has been built dynamically(debug and release). I have linked my app to the <QTDIR>\plugins\imageformats\qgifd4.lib.

I create a QImage from a gif file on disk. But the QImage returned is null. I logged the loading of the gif plugin using QT_DEBUG_PLUGINS flag. The gif plugin logs are as below

'MyApp.exe': Loaded 'C:\Qt\VS45\qt\plugins\imageformats\qgifd4.dll', Symbols loaded.
'MyApp.exe': Unloaded 'C:\Qt\VS45\qt\plugins\imageformats\qgifd4.dll'

I also debugged the creation of QImage. In the function createReadHandlerHelper() the code looks like this
QFactoryLoader *l = loader();
QStringList keys = l->keys();

after this when the code searches for the "gif" extension in these keys nothing is found.
Does it mean that the gif plugin is corrupt? What am I doing wrong? Please help!! I have stuck here for a long time.

[vishwajeet]

Try this:

In Qt folder go to <Qt Version Folder>\examples\widgets\imageviewer
Try to load your gif images thru this application, if they are getting loaded then no prob with your plugin.

2nd step: Check the gif path in your application. R u loading them from resource file or thru relative path, whatever is the case but using QFileInfo class you can check if the path is valid before u pass that to QImage class.

[spsingh]

The imageviewer is also not able to load gif files. I am loading the files thru absolute path.

[Yash]

Check gif files are ok

Try to create qrc (qt resource file) Add file into it

Then load it.

Also if possible update your version.

[spsingh]

I have upgraded to 4.6.3 , and now the QImage objects loads the gif file properly. But I am unable to render it in a TableView cell. I have a custom model for the view whose data function has the following pseudo code

QVariant data()
{
if (role== displayrole)
return QVariant(QImage(gifFilePath));
else
return QVariant();
}

[vishwajeet]

Start new thread

[spsingh]

After reading the documentation again, I figured out that it should be the decoration role and not the display role for the gif to render.