<![CDATA[Header file not found]]>In the latest version of QtCreator, I used add new to create a class, both header and sources files were created. I promoted a Widget in Design to the new class, renamed and checked autoFill Background. Then when I started to add
ui->canvas->setBackgroundRole(QPalette::Base);
I see the message canvas.h not found.

An aside, one note also about the editor: I found using ui. and having the editor change it to ui-> very helpful, but that has been removed.

How do I get a header file, that was created by Qt, found?

]]>https://forum.qt.io/topic/138844/header-file-not-foundRSS for NodeMon, 17 Aug 2026 01:09:19 GMTWed, 24 Aug 2022 14:06:49 GMT60<![CDATA[Reply to Header file not found on Wed, 24 Aug 2022 14:33:42 GMT]]>@mpergand I see the problem, it should be canvas and not canas! The old eyes have see too many mango seasons. Thanks.

]]>https://forum.qt.io/post/726028https://forum.qt.io/post/726028Wed, 24 Aug 2022 14:33:42 GMT<![CDATA[Reply to Header file not found on Wed, 24 Aug 2022 14:25:32 GMT]]>@ofmrew said in Header file not found:

I see the message canvas.h not found.

HEADERS +=
mainwindow.h
mycanas.h ---> ?

]]>https://forum.qt.io/post/726027https://forum.qt.io/post/726027Wed, 24 Aug 2022 14:25:32 GMT<![CDATA[Reply to Header file not found on Wed, 24 Aug 2022 14:15:49 GMT]]>@ofmrew I forgot to ass additional information:
QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

You can make your code fail to compile if it uses deprecated APIs.

In order to do so, uncomment the following line.

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

SOURCES +=
main.cpp
mainwindow.cpp
mycanas.cpp

HEADERS +=
mainwindow.h
mycanas.h

FORMS +=
mainwindow.ui

Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

{noformat}
Qt 6.3.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 10.3.1 20210422 (Red Hat 10.3.1-1)) on "xcb"
OS: Linux Mint 20.1 [linux version 5.4.0-58-generic]

Kit compiler Desktop qt 6.3.1 GCC 64bit

]]>https://forum.qt.io/post/726024https://forum.qt.io/post/726024Wed, 24 Aug 2022 14:15:49 GMT<![CDATA[Reply to Header file not found on Wed, 24 Aug 2022 14:10:22 GMT]]>I think it's a regression in Qt Creator 8. Please open a bug report at https://bugreports.qt.io/

Thank you.

]]>https://forum.qt.io/post/726023https://forum.qt.io/post/726023Wed, 24 Aug 2022 14:10:22 GMT