I repeatedly see people having problems with slots not being called. I would like to collect some of the most common reasons. So maybe I can help people and avoid a lot of redundant questions. Wha...

I'm trying to write a simple downloader in qt. It's based on this example: http://www.ggkf.com/qt/qnetworkrequest-to-download-an-image downloader.cpp: void Downloader::GetImage( QString _url, QNetw...