Qt Centre Forum FAQ

You are probably using relative paths to your images such as:

QPixmap("icons/fileopen.png");

If you move your application or start with a different working directory but leave the images where they were the relative path to them will have changed and your program won't be able to open the file containing the image because the path is incorrect.

To solve this case use one of the following (in order from best solution to least good one):

1. Embed the images directly into your application using Qt Resource System
2. Use QCoreApplication::applicationDirPath() that points to the directory containing the application:

   QPixmap(QCoreApplication::applicationDirPath()+"/icons/fileopen.png");

3. Use absolute paths to the images and store them in a well known place such as /usr/share/apps/myappname or one of QDesktopServices::StandardLocation

You probably didn't deploy image plugins with your application. You need to copy the contents of plugins/imageformats directory of your Qt installation to the imageformats subdirectory of the directory where you deployed the application binary.

For instance if you deployed the application to C:\Program Files\MyApp, you need to copy the plugins to C:\Program Files\MyApp\imageformats.

Imageformat plugins are libraries called "qjpeg", "qsvg", "qtiff", etc.