QT 4.5.2
WINDOW 7
VS2005
add in 1.1.4

I use QPluginLoader to load the qjpegd4.dll
QPluginLoader::isLoaded() return ture
but I can not display a .jpg in a widget (other imageformats such as bmp and png work well)
QImage image("pic.jpg");
ui.widget->setImage(&image);

in show output from debug it says
qjpegd4.dll No symbols loaded.

what did I miss?

Regards,