I'm using QT 6.4.2 at Windows that write App, but when I need to use QHBoxLayout, I get
error:Unknown type name 'QHBoxLayout'
so I open help document in QT, that found sample about QHBoxLayout, I according to official document create a new project that is very simple:
.pro file is
QT += core gui widgets
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
HEADERS +=
FORMS +=
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
main.cpp is
#include <QApplication>
#include <QWidget>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget *window = new QWidget;
QPushButton *button1 = new QPushButton("One");
QPushButton *button2 = new QPushButton("Two");
QPushButton *button3 = new QPushButton("Three");
QPushButton *button4 = new QPushButton("Four");
QPushButton *button5 = new QPushButton("Five");
QHBoxLayout *layout = new QHBoxLayout(window);
layout->addWidget(button1);
layout->addWidget(button2);
layout->addWidget(button3);
layout->addWidget(button4);
layout->addWidget(button5);
window->show();
return a.exec();
}
Below is some picture at Windows:
Below is Windows QT version and kit setting:
I try to clean and re-build many times, but it still can't work. I also can't find out what reason cause the problem, so I try to open the same project with QT(6.4.1 version) at MacBook Pro, The same project can surprisingly be compiled successfully and generate executable programs on the Mac platform.
Below is some picture at MacBook Pro:
So is that QT latest version's Bug at Windows? How can I solve this problem?
First update
As @HiFile.app - best file manager said, when I change QHBoxLayout to QVBoxLayout, it seems still can't work when compile, see below picture.
Now my main.cpp file is :
#include <QApplication>
#include <QWidget>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget *window = new QWidget;
QPushButton *button1 = new QPushButton("One");
QPushButton *button2 = new QPushButton("Two");
QPushButton *button3 = new QPushButton("Three");
QPushButton *button4 = new QPushButton("Four");
QPushButton *button5 = new QPushButton("Five");
QVBoxLayout *layout = new QVBoxLayout(window);
layout->addWidget(button1);
layout->addWidget(button2);
layout->addWidget(button3);
layout->addWidget(button4);
layout->addWidget(button5);
window->show();
return a.exec();
}
I installed QT through the following method:
Currently, I have only found issues with QHBoxLayout and QVBoxLayout, and have not discovered any issues with other controls for the time being.
Where did the problem occur?
Second update
When I use below command:
qmake.exe ChangeFontSize.pro
will generate Makefile file.
then I use "Developer Command Prompt for VS 2022" to run below command:
nmake release
for compile also get same error
C:\my-win10-document\code\ChangeFontSize>nmake release
Microsoft (R) 程序维护实用工具 14.33.31630.0 版
版权所有 (C) Microsoft Corporation。 保留所有权利。
C:\my-win10-document\software---install\VS--install\VC\Tools\MSVC\14.33.31629\bin\HostX86\x86\nmake.exe -f Makefile.Release
Microsoft (R) 程序维护实用工具 14.33.31630.0 版
版权所有 (C) Microsoft Corporation。 保留所有权利。
C:\my-win10-document\software---install\QT--install\6.4.2\mingw_64\bin\uic.exe mainwindow.ui -o ui_mainwindow.h
g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I. -I../../software---install/QT--install/6.4.2/mingw_64/include -I../../software---install/QT--install/6.4.2/mingw_64/include/QtWidgets -I../../software---install/QT--install/6.4.2/mingw_64/include/QtGui -I../../software---install/QT--install/6.4.2/mingw_64/include/QtCore -Irelease -I. -I/include -I../../software---install/QT--install/6.4.2/mingw_64/mkspecs/win32-g++ -o release\main.o main.cpp
g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I. -I../../software---install/QT--install/6.4.2/mingw_64/include -I../../software---install/QT--install/6.4.2/mingw_64/include/QtWidgets -I../../software---install/QT--install/6.4.2/mingw_64/include/QtGui -I../../software---install/QT--install/6.4.2/mingw_64/include/QtCore -Irelease -I. -I/include -I../../software---install/QT--install/6.4.2/mingw_64/mkspecs/win32-g++ -o release\mainwindow.o mainwindow.cpp
mainwindow.cpp: In constructor 'MainWindow::MainWindow(QWidget*)':
mainwindow.cpp:29:6: error: 'QHBoxLayout' was not declared in this scope; did you mean 'QLayout'?
29 | QHBoxLayout *hLayout = new QHBoxLayout;
| ^~~~~~~~~~~
| QLayout
mainwindow.cpp:29:19: error: 'hLayout' was not declared in this scope; did you mean 'QLayout'?
29 | QHBoxLayout *hLayout = new QHBoxLayout;
| ^~~~~~~
| QLayout
mainwindow.cpp:29:33: error: 'QHBoxLayout' does not name a type; did you mean 'QLayout'?
29 | QHBoxLayout *hLayout = new QHBoxLayout;
| ^~~~~~~~~~~
| QLayout
mainwindow.cpp:34:6: error: 'QVBoxLayout' was not declared in this scope; did you mean 'QLayout'?
34 | QVBoxLayout *vLayout = new QVBoxLayout;
| ^~~~~~~~~~~
| QLayout
mainwindow.cpp:34:19: error: 'vLayout' was not declared in this scope; did you mean 'QLayout'?
34 | QVBoxLayout *vLayout = new QVBoxLayout;
| ^~~~~~~
| QLayout
mainwindow.cpp:34:33: error: 'QVBoxLayout' does not name a type; did you mean 'QLayout'?
34 | QVBoxLayout *vLayout = new QVBoxLayout;
| ^~~~~~~~~~~
| QLayout
NMAKE : fatal error U1077: “C:\my-win10-document\software---install\QT--install\Tools\mingw1120_64\bin\g++.EXE”: 返回代码“0x1”
Stop.
NMAKE : fatal error U1077: “C:\my-win10-document\software---install\VS--install\VC\Tools\MSVC\14.33.31629\bin\HostX86\x86\nmake.exe”: 返回代码“0x2”
Stop.
Here is picture:
Third update
I created a new project again for test QWidget and QPushButton in Windows platform that can work. See below picture.
But when I only new add two line code in main.cpp (No changes have been made elsewhere), then compile will get error, see below picture:
So far, I have confirmed that using QHBoxLayout and QVBoxLayout is problematic.
I solved the problem by reinstalling QT by myself, and now it can be used normally.