Qt creator 9.0.1 Header file QtNetwork file not found.

John Telek

Hi everyone. I'm running qtcreator 9.0.1 on Ubuntu 22.04 (from the qt installer not apt) and if I try and include QtNetwork in a QT6 project, it says file not found. If I open a example network program, no error.

Please help.

Cheers,
John T

jsulm

@John-Telek Did you add

find_package(Qt6 REQUIRED COMPONENTS Network)
target_link_libraries(mytarget PRIVATE Qt6::Network)

to your CMakeLists.txt in case you're using CMake
Or

QT += network

if you're using QMake?

John Telek

I added it and got this error.

/home/user/Code/QT/TCOM3/CMakeLists.txt:15: error: Cannot specify link libraries for target "mytarget" which is not built by this project.

anything else I could look at. I'm a complete newbie to programming and C++.

Cheers,
John

jsulm

@John-Telek Your CMakeLists.txt is wrong. Please post it.

John Telek

My CmakeLists

cmake_minimum_required(VERSION 3.5)

project(TCOM3 VERSION 0.1 LANGUAGES CXX)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Core Gui Network Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)



set(PROJECT_SOURCES
        main.cpp
        mainwindow.cpp
        mainwindow.h
        mainwindow.ui
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(TCOM3
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )
# Define target properties for Android with Qt 6 as:
#    set_property(TARGET TCOM3 APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()
    if(ANDROID)
        add_library(TCOM3 SHARED
            ${PROJECT_SOURCES}
        )
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
    else()
        add_executable(TCOM3
            ${PROJECT_SOURCES}
        )
    endif()
endif()

target_link_libraries(TCOM3 PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

set_target_properties(TCOM3 PROPERTIES
    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    WIN32_EXECUTABLE TRUE
)

install(TARGETS TCOM3
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})

if(QT_VERSION_MAJOR EQUAL 6)
    qt_finalize_executable(TCOM3)
endif()

Cheers

kkoehne

@John-Telek said in Qt creator 9.0.1 Header file QtNetwork file not found.:

/home/user/Code/QT/TCOM3/CMakeLists.txt:15: error: Cannot specify link libraries for target "mytarget" which is not built by this project.

You need to replace mytarget with the CMake target that you're defining in the CMakeLists.txt file. That is, if you have a line like

add_executable(somename ...)

  or add_library(somename ...)

Then somename is the CMake target name you want to use, instead of mytarget.

John Telek

I did and still get this error.

/home/user/Code/QT/TCOM3/CMakeLists.txt:15: error: Cannot specify link libraries for target "TCOM3" which is not built by this project.

The name is correct. And I still dont understand why #include <QtNetwork> and #include <QTcpSocket> only work in the examples.

Cheers

jsulm

@John-Telek Please post your current CMakeLists.txt file.
"And I still dont understand why #include <QtNetwork> and #include <QTcpSocket> only work in the examples" - did you compare your CMakeLists.txt with the one from example?

John Telek

Now none of my base code will compile. Keep getting a Ninja -C error.

JT

jsulm

@John-Telek Make a complete rebuild: delete everything in build folder (including hidden files), run CMake and build.
In case of error message post it here.

micha_eleric

@kkoehne said in Qt creator 9.0.1 Header file QtNetwork file not found.:

@John-Telek said in Qt creator 9.0.1 Header file QtNetwork file not found.:

/home/user/Code/QT/TCOM3/CMakeLists.txt:15: error: Cannot specify link libraries for target "mytarget" which is not built by this project.

You need to replace mytarget with the CMake target that you're defining in the CMakeLists.txt file. That is, if you have a line like
add_executable(somename ...)
  or add_library(somename ...)
Then somename is the CMake target name you want to use, instead of mytarget.

please explain "somename" more

ChrisW67

@micha_eleric "somename" is a placeholder for the name you gave CMake for your executable or library in CMakeLists.txt. This name will appear in one of these directives:

add_executable(somename  ...)
add_library(somename ....)
qt_add_executable(somename ....)
qt_add_library(somename ...)

See Getting started with CMake

micha_eleric

@ChrisW67 said in Qt creator 9.0.1 Header file QtNetwork file not found.:

@micha_eleric "somename" is a placeholder for the name you gave CMake for your executable or library in CMakeLists.txt. This name will appear in one of these directives:
add_executable(somename  ...)
add_library(somename ....)
qt_add_executable(somename ....)
qt_add_library(somename ...)
See Getting started with CMake

i assumed that "somename" was a placeholder for project name, but gives same error, but with project name instead.

jsulm

@micha_eleric Please show your current CMakeLists.txt file.
Also, you should do complete rebuild after changing CMakeLists.txt