我在编写 App 的 Windows 上使用 QT 6.4.2，但是当我需要使用 QHBoxLayout 时，我得到

error:Unknown type name 'QHBoxLayout'

于是我打开QT的帮助文档，里面找到了QHBoxLayout的sample，我按照官方文档新建一个工程，很简单：

.pro 文件是

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 是

#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();
}

下面是 Windows 上的一些图片：

下面是 Windows QT 版本和套件设置：

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.