In Qt, when an object is dropped onto a widget the following event handler is to be used to get the list of URLs of the dropped objects-
 

void Dialog::dropEvent(QDropEvent *event)

{

if (mimeData->hasUrls()) {

QList urlList = mimeData->urls();

qDebug() << urlList.at(0).path();

}

}

This code, according to the Drop Site example in Qt Demo (see below) should print the filename of the first file dropped.

Following is the output-

1. On Linux
/home/user/Desktop/pic1.jpg

2. On Windows
/C:/Users/Abcd/Desktop/pic1.jpg

But this was not expected,
As you might have noticed, there is a stray '/' in the beginning of the path which makes the filename unusable. This makes the Drop Site example to misbehave when run in Windows.
A better alternative is to use urlList.at(0).toLocalFile() instead of urlList.at(0).path(); and the problem gets solved.