使用Qt显示GIF格式动画

I put this here in case someone other than me runs into the same problem.

Problem

The GIF would not load and isValid() returns false.

Code

// Load animated GIF
QMovie* movie = new QMovie("foo.gif");

// Make sure the GIF was loaded correctly
if (!movie->isValid()) 
{
    // Something went wrong :(
}

// Play GIF
QLabel* label = new QLabel(this);
label->setMovie(movie);
movie->start(); 

Solution

To solve this, I had to put Qt's GIF-plugin qgif4.dll in a folder named imageformats next to my exe to be able to use GIFs.

The dll can be found under /plugins/imageformats/qgif4.dll