QUrl and YouTube (Qt 4.8)

Question

I have an encoded YouTube url (directly to the video), example:

http%253A%252F%252Fr7---sn-xjpm-q0nl.c.youtube.com%252Fvideoplayback%253Fgcr%253Dde%2526ratebypass%253Dyes%2526newshard%253Dyes%2526source%253Dyoutube%2526fexp%253D920704%25252C912806%25252C928001%25252C922403%25252C922405%25252C929901%25252C913605%25252C929104%25252C929109%25252C913546%25252C913556%25252C908493%25252C908496%25252C920201%25252C913302%25252C919009%25252C911116%25252C901451%25252C902556%2526ipbits%253D8%2526key%253Dyt1%2526id%253De4b675c403014739%2526mv%253Dm%2526cp%253DU0hUTFVTVV9LUENONF9NTVlFOlVHOGtlTmJ2WWpt%2526mt%253D1357567034%2526itag%253D46%2526ms%253Dau%2526expire%253D1357587466%2526sparams%253Dcp%25252Cgcr%25252Cid%25252Cip%25252Cipbits%25252Citag%25252Cratebypass%25252Csource%25252Cupn%25252Cexpire%2526ip%253D46.59.194.67%2526upn%253DVaZiTmBJt0Y%2526sver%253D3%26quality%3Dhd1080%26itag%3D46%26fallback_host%3Dtc.v19.cache5.c.youtube.com%26type%3Dvideo%252Fwebm%253B%2Bcodecs%253D%2522vp8.0%252C%2Bvorbis%2522%26sig%3D6C3258197CB246FA9531E056083053B1B7EAA9C2.758C7B46E77C4B5CF5C7B0C5CBEDCB5F675559D7

This above url is in a QString variable "str", how can I set it to QUrl?

QUrl url = QUrl::fromPercentEncoding(str.toUtf8());

doesn't work! An

qDebug() << url.toString();

gives the (above) encoded url back and not the human displayable!

Answer 1

Your url is encoded twice. %25 is the encoded version of %. That's why you have to call fromPercentEncoding twice, too.

http%253A%252F%252F becomes http%3A%2F%2F after the first round and http:// after the second one.

Example:

#include <QApplication>
#include <QDebug>
#include <QUrl>

int main(int argc, char *argv[]) {

  QApplication app(argc, argv);
  QString str="http%253A%252F%252Fr7---sn-xjpm-q0nl.c.youtube.com%252Fvideoplayback%253Fgcr%253Dde%2526ratebypass%253Dyes%2526newshard%253Dyes%2526source%253Dyoutube%2526fexp%253D920704%25252C912806%25252C928001%25252C922403%25252C922405%25252C929901%25252C913605%25252C929104%25252C929109%25252C913546%25252C913556%25252C908493%25252C908496%25252C920201%25252C913302%25252C919009%25252C911116%25252C901451%25252C902556%2526ipbits%253D8%2526key%253Dyt1%2526id%253De4b675c403014739%2526mv%253Dm%2526cp%253DU0hUTFVTVV9LUENONF9NTVlFOlVHOGtlTmJ2WWpt%2526mt%253D1357567034%2526itag%253D46%2526ms%253Dau%2526expire%253D1357587466%2526sparams%253Dcp%25252Cgcr%25252Cid%25252Cip%25252Cipbits%25252Citag%25252Cratebypass%25252Csource%25252Cupn%25252Cexpire%2526ip%253D46.59.194.67%2526upn%253DVaZiTmBJt0Y%2526sver%253D3%26quality%3Dhd1080%26itag%3D46%26fallback_host%3Dtc.v19.cache5.c.youtube.com%26type%3Dvideo%252Fwebm%253B%2Bcodecs%253D%2522vp8.0%252C%2Bvorbis%2522%26sig%3D6C3258197CB246FA9531E056083053B1B7EAA9C2.758C7B46E77C4B5CF5C7B0C5CBEDCB5F675559D7";
  qDebug() << QUrl::fromPercentEncoding(str.toUtf8());
  qDebug() << QUrl::fromPercentEncoding(QUrl::fromPercentEncoding(str.toUtf8()).toUtf8());
  return app.exec();
}