I'm trying to make a program that toggles showdesktop.
I made this from the source code of plasma_applet_showdesktop.so:
NETRootInfo info(QX11Info::display(), 0);
info.setShowingDesktop(true);

But the NetRootInfo constructor gives a segmentation fault.
Can anyone tell me why?

I'm using Mandriva 2009, KDE 4.1.2.

See below for code.

vatbier

myshowdesktop.cpp :

Code: Select all

// myShowDesktop.cpp,
#include
#include
#include
#include
using namespace std;

int main()
{
    NETRootInfo info(QX11Info::display(), 0);
   // HERE OCCURS THE SEGMENTATION FAULT
   
    info.setShowingDesktop(true);
}



CMakeLists.txt :

Code: Select all

project(mijnshowdesktop)
find_package(KDE4 REQUIRED)
include(KDE4Defaults)
include(MacroOptionalAddSubdirectory)

add_definitions (${QT_DEFINITIONS} ${KDE4_DEFINITIONS})

include_directories( ${CMAKE_CURRENT_SOURCE_DIR} ${KDE4_INCLUDES} )
set(mySources myshowdesktop.cpp)
kde4_add_executable(mijnshowdesktop ${mySources})
target_link_libraries(mijnshowdesktop ${KDE4_KDEUI_LIBS} ${KDE4_KPARTS_LIBS} )



vatbier wrote:I'm trying to make a program that toggles showdesktop.
I made this from the source code of plasma_applet_showdesktop.so:
NETRootInfo info(QX11Info::display(), 0);
info.setShowingDesktop(true);

But the NetRootInfo constructor gives a segmentation fault.
Can anyone tell me why?

Check if it already segaults at QX11Info::display()
That class/method looks like it might need a QApplication instance

Cheers,
_

No segfault occurs when I do this:

Code: Select all

int main()
{   
   Display* dp=QX11Info::display();
   std::cout
...
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    NETRootInfo info(QX11Info::display(), 0);
    info.setShowingDesktop(true);


And it runs now without segfault and it minimizes all windows now!!

Thank you very much!
I know very little yet about Qt programming

vatbier

Are you planning to make this into a plasmoid so there can be Show Desktop button and a keyboard shortcut to go along with it?

I want to have a ShowDesktop icon in the quicklauncher plasmoid that I have placed next to the icon of K menu.
The ShowDesktop widget that now sits next to the quicklauncher takes too much place (I like small icons like those of quicklaunch in Windows XP and Vista).
Dragging the ShowDesktop widget to the quicklauncher doesn't work as the quicklauncher widget can't work with "services", it expects a .desktop file with an exec command.
In KDE 3.5.9 I had made my own .desktop file with a dcop command.
Now in KDE 4.1.2 I want to do the same with a c++ program (there isn't yet a full dbus interface for plasma)