Showing JPG image with Qt does not work with release executable

Question

i have a annoying issue with showing jpg images with qt. I devlope with Visual Studio 2008 in Windows 7 and using the Qt version 4.8.2. I will now describe my problem by mea

Answer 1

Therefore I copied the contents of the plugin folder of Qt into the application directory (where collidingmice.exe is).

You need to put the plugins into an "imageformats" subdirectory, e.g. like

bin
 ├── collidingmice.exe
 └── imageformats
       ├── qjpeg4.dll
       ├ ...

See also http://www.qtcentre.org/threads/46927-Location-of-imageformats-directory

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It turned out that the OP had already set up the directory structure accordingly. The root cause was that a wrong QtGui4.dll has been loaded. This can be fixed "by copying the DLL directly into the application directory or by changing the order of the paths in the PATH environment variable so that your Qt bin directory is placed in front of all other paths containing a QtGui4.dll."

In any case, the Process Monitor is a good tool to track down such issues.