Development/Tutorials/First program: Difference between revisions

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Your first program shall greet the world with a friendly "hello world", what else ? For that, we will use a KMessageBox. To get more information about the KMessageBox-Class, type "kde: kmessagebox" in your konqueror and it will redirect you to http://developer.kde.org/documentation/library/cvs-api/kdelibs-apidocs/kdeui/html/classKMessageBox.html
This [https://develop.kde.org/docs/getting-started/hello_world/ first program] page was move [https://develop.kde.org/docs/getting-started/hello_world/ here].
<code cppqt n>
#include <QString>
#include <kapplication.h>
#include <kaboutdata.h>
#include <kmessagebox.h>
#include <kcmdlineargs.h>
 
int main (int argc, char *argv[])
{
KAboutData aboutData( "test", "test",
                      "1.0", "test", KAboutData::License_GPL,
                      "(c) 2006" );
KCmdLineArgs::init( argc, argv, &aboutData );
KApplication khello;
KGuiItem kgi( QString( "Hello" ), QString(),
              QString( "this is a tooltip" ),
              QString( "this is whatsthis" ) );
KMessageBox::questionYesNo( 0, "text", "caption", kgi );
}
</code>
If you set up your environment as described in [[Build/Unstable Version|Build/Unstable Version]], you can compile this code with
gcc hello.cpp -o hello -I/home/kde-devel/qt-unstable/include/Qt \
-I/home/kde-devel/qt-unstable/include/Qt-Core \
-I/home/kde-devel/qt-unstable/include -I/home/kde-devel/kde/include \
-L/home/kde-devel/kde/lib \
-L/home/kde-devel/qt-unstable/lib -lkdeui -lkdecore -ldl
and then run it with
./hello
 
If that worked, you may want to use cmake, just like the rest of KDE.
Create a file named CMakeLists.txt with this content:
<code>
#name of the project
project (hello)
 
#find and use the necessary libraries and headers
find_package(KDE4 REQUIRED)
include_directories( ${KDE4_INCLUDES} )
 
# compile
# using a variable is not really necessary:
# using the single line
# kde4_add_executable(hello hello.cpp)
# does the same, but when you add more stuff to the project,
# using the variable makes things a bt easier.
set(helloSources hello.cpp)
kde4_add_executable(hello ${helloSources})
 
# and link properly
target_link_libraries( hello ${KDE4_KDEUI_LIBS} ${KDE4_KIO_LIBS})
</code>
 
{{KDE4}}

Latest revision as of 14:30, 8 September 2020

This first program page was move here.