cmake - Qt5 linux how to set window icon image -

i have ui have designed in qt designer , have written code in c++. using catkin, cmake, build project. when program launched, application icon looks like, .i have image specify, have been unable figure out how work.

my project directory structure looks following

package |--cmakelists.txt |--src     |--main.cpp      |--mainwindow.cpp     |--resources        |--images            |--kitty.png        |--icons.qrc |--include     |--mainwindow.hpp |--ui     |--mainwindow.ui 

my cmakelists.txt file looks like,

cmake_minimum_required(version 2.8.7) project(shared_memory_transport_sliderboard)  find_package(catkin required)  find_package(qt5widgets required) set(cmake_cxx_flags "${cmake_cxx_flags}     ${qt5widgets_executable_compile_flags}") add_definitions(${qt5widgets_definitions})  set(includes_dir ${project_source_dir}/include) set(sources_dir ${project_source_dir}/src)  catkin_package( include_dirs ${includes_dir} depends qt5widgets )  # c++11 include(checkcxxcompilerflag) check_cxx_compiler_flag("-std=c++0x" compiler_supports_cxx0x) if(compiler_supports_cxx0x)     set(cmake_cxx_flags "${cmake_cxx_flags} -std=c++0x") else()     message(fatal_error "the compiler ${cmake_cxx_compiler} has no     c++0x support. please use different c++ compiler.") endif()  include_directories( ${cmake_current_binary_dir} ${includes_dir} ${catkin_include_dirs} ${qt5widgets_include_dirs} )  set(qt_forms ui/mainwindow.ui ) set(qt_moc      ${includes_dir}/${project_name}/mainwindow.h ) set(qt_sources     src/mainwindow.cpp )  qt5_wrap_cpp(qt_moc_hpp ${qt_moc}) qt5_wrap_ui(qt_forms_hpp ${qt_forms}) qt5_add_resources(ui_resources ${project_source_dir}/resources/icons.qrc)  add_executable(smt_sliderboard src/main.cpp ${qt_sources}   ${qt_moc_hpp} ${qt_forms_hpp} ${ui_resources})  target_link_libraries(smt_sliderboard ${catkin_libraries} qt5::widgets)  install(targets smt_sliderboard   archive destination ${catkin_package_lib_destination}   library destination ${catkin_package_lib_destination}   runtime destination ${catkin_package_bin_destination} )  install(directory include/${project_name}/     destination ${catkin_package_include_destination}     files_matching pattern "*.h") 

when compiling code compiler generate qrc_icons.cpp.o object, when run executable icon doesn't show up. icons.qrc file have looks like,

<!doctype rcc> <rcc version="1.0">     <qresource prefix="/icons">         <file alias="kitty">images/kitty.jpg</file>     </qresource> </rcc> 

i have tried adding following in mainwindow.h,

qapplication myapp(argc, argv); qicon appicon; appicon.addfile(":/icons/kitty"); myapp.setwindowicon(appicon); 

and compiles fine, still no icon. feel have tried no luck, help!

from qt resource system docs:

note listed resource files must located in same directory .qrc file, or 1 of subdirectories.

so need directory structure like:

|--images     |--images        |--kitty.png     |--icons.qrc 

update:

you should consult setting application icon in qt docs make sure deal platform-specific issues.