Get Hot New Stuff 3 Introduction
Tutorial Series   HotNewStuff
Previous   Getting started with KDE development
What's Next   Get Hot New Stuff 3 - Upload
Further Reading   n/a


Here is a small example of an application that asks for wallpapers. It lets the user install them into the system wallpaper directory.

The Code

The example consists of just one c++ source file. //khotnewstuff.cpp

  1. include <kapplication.h>
  2. include <kdebug.h>
  3. include <klocale.h>
  4. include <kcmdlineargs.h>
  5. include <kaboutdata.h>
  1. include <knewstuff3/downloaddialog.h>

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

   KAboutData about("khotnewstuff_example", 0, ki18n("KHotNewStuff"), "0.4");
   KApplication i;
   KNS3::DownloadDialog dialog(args->arg(0));
   foreach (const KNS3::Entry& e, dialog.changedEntries()) {
       kDebug() << "Changed Entry: " <<;

   return 0;


The Configuration File (.knsrc)

For this to work, a file that sets up KNewStuff khotnewstuff_example.knsrc is needed. The file has to be in kde/share/config/khotnewstuff_example.knsrc. (The name of the file is taken from the about data).

[KNewStuff3] ProvidersUrl= Categories=KDE Wallpaper 1920x1200,KDE Wallpaper 1600x1200 TargetDir=wallpapers Uncompress=archive

Uncompress can be one of: always, never or archive:

  • always: assume all downloaded files are archives and need to be extracted
  • never: never try to extract the file
  • archive: if the file is an archive, uncompress it, otherwise just pass it on

You have different options to set the target install directory:

  • StandardResource: standard ressouce dir, such as .kde/share/wallpapers. This is what KStandardDirs::locateLocal(name) will return.
  • TargetDir: a directory in the share/apps section, such as .kde/share/apps/wallpapers. This is what KStandardDirs::locateLocal("data", name) will return.

Linking in CMakeLists.txt

To link against KNS3, just link against ${KDE4_KNEWSTUFF3_LIBS}. Example:

target_link_libraries(ktexteditor_codesnippets_core ${KDE4_KDEUI_LIBS} ${KDE4_KTEXTEDITOR_LIBS} ${KDE4_KNEWSTUFF3_LIBS})


If you don't like to use an external dialog, you can also use a widget instead. Just replace DownloadDialog with DownloadWidget and you're good to go. This is especially nice as additional page in existing config dialogs.

This page was last edited on 30 January 2020, at 11:51. Content is available under Creative Commons License SA 4.0 unless otherwise noted.