C++ Qt5和Cmake链接QApplication标头错误

我正在尝试将cmake与我的一个使用QApplication的Qt项目联系起来。 我在构建项目时遇到了这个错误

Cannot open include file: 'QApplication': No such file or directory

我只在.cpp文件中使用QApplication和QWebEngineeWidget，在头文件中使用QDir

main.h

#ifndef MAIN_H
#define MAIN_H

#include <QDir>

QUrl getlink(){

    QUrl url = QUrl::fromLocalFile(QDir::currentPath();

    return url;

}


#endif // MAIN_H

我知道我可能不需要其他链接的LIB，但我将它们保留在那里以备将来发展

无论如何，当我在目标链接中为QWebEngineView添加Qt5:：WebEngineWidget时，效果很好，但当我为QApplication添加Qt5:：Widget时，它似乎无法找到文件，我不知道为什么

---

你知道问题出在哪里吗？

正如@vre在评论中提到的，你从来没有将你的GUI应用程序链接到Qt5。下面是您发布的CMakeLists.txt的固定版本

---

您应该将target_link_librariesSIM_APP Qt5:：gui或target_link_librariesSIM_APP QtSimAppProjectLib添加到CMake文件中。否则，SIM_应用程序目标不知道在哪里可以找到添加源的包含。我按照您的建议执行了操作，但出现了此错误。无法为此项目未生成的目标SIM_应用程序指定链接库。SIM_应用程序确实找到了其他所有内容的包含QApplication是唯一找不到的应用程序。您将目标链接放在哪里了？它必须在add_可执行文件之后，而不是之前。这些命令取决于位置。感谢@vre和Paul，我添加了这些更改，现在可以使用了。

    #include <QApplication>
    #include <QWebEngineView>
    #include "main.h"

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QApplication app(argc, argv);

    QWebEngineView view;
    view.setUrl(getlink());
    view.resize(1524, 850);
    view.show();

   return app.exec();

}

if (ENABLE_QT_SimApp_GUI)

find_package(qtlibs)

find_package(SimApp)
if (NOT SimApp_FOUND)
    message(FATAL_ERROR "Could not find SimApp")
endif(NOT SimApp_FOUND)

set(CMAKE_PREFIX_PATH ${PREFIX_PATH})
message(STATUS "CMAKE_PREFIX_PATH" ${CMAKE_PREFIX_PATH})

find_package(Qt5 REQUIRED COMPONENTS Widgets Core Gui Sql PrintSupport WebEngineWidgets)

qt5_wrap_cpp(QtSimAppProjectLib_hdr_moc ${QtSimAppProjectLib_hdr})
qt5_wrap_ui(QtSimAppProjectLib_ui_uic ${QtSimAppProjectLib_ui})
qt5_add_resources(QtSimAppProjectLib_qrc_rcc ${QtSimAppProjectLib_qrc})

include_directories (${PROJECT_SOURCE_DIR})
include_directories (${PROJECT_BINARY_DIR})

add_library (QtSimAppProjectLib STATIC ${QtSimAppProjectLib_src} ${QtSASQProjectLib_hdr_moc} ${QtSASQProjectLib_ui_uic})

target_link_libraries (QtSimAppProjectLib
        Qt5::Core
        Qt5::Gui
        Qt5::Widgets
        Qt5::Sql
        Qt5::PrintSupport
        Qt5::WebEngineWidgets)

#WIN32 to suppress the console window under Windows
add_executable(SIM_APP WIN32 ${QtSimAppProjectLib_src} ${QtSimAppProjectLib_qrc_rcc})

    if (ENABLE_COPY_QT_LIBS AND WIN32)
        find_package(qtdlls)
    endif(ENABLE_COPY_QT_LIBS AND WIN32)

endif (ENABLE_QT_SimApp_GUI)

if (ENABLE_QT_SimApp_GUI)

find_package(qtlibs)

find_package(SimApp)
if (NOT SimApp_FOUND)
    message(FATAL_ERROR "Could not find SimApp")
endif(NOT SimApp_FOUND)

set(CMAKE_PREFIX_PATH ${PREFIX_PATH})
message(STATUS "CMAKE_PREFIX_PATH" ${CMAKE_PREFIX_PATH})

find_package(Qt5 REQUIRED COMPONENTS Widgets Core Gui Sql PrintSupport WebEngineWidgets)

qt5_wrap_cpp(QtSimAppProjectLib_hdr_moc ${QtSimAppProjectLib_hdr})
qt5_wrap_ui(QtSimAppProjectLib_ui_uic ${QtSimAppProjectLib_ui})
qt5_add_resources(QtSimAppProjectLib_qrc_rcc ${QtSimAppProjectLib_qrc})

include_directories (${PROJECT_SOURCE_DIR})
include_directories (${PROJECT_BINARY_DIR})

add_library (QtSimAppProjectLib STATIC ${QtSimAppProjectLib_src} ${QtSASQProjectLib_hdr_moc} ${QtSASQProjectLib_ui_uic})

target_link_libraries (QtSimAppProjectLib
        Qt5::Core
        Qt5::Gui
        Qt5::Widgets
        Qt5::Sql
        Qt5::PrintSupport
        Qt5::WebEngineWidgets)

#WIN32 to suppress the console window under Windows
add_executable(SIM_APP WIN32 ${QtSimAppProjectLib_src} ${QtSimAppProjectLib_qrc_rcc})

# use one of the following target_link_libraries() calls
target_link_libraries(SIM_APP Qt5::Core Qt5::Gui Qt5::Widgets)
# target_link_libraries(SIM_APP QtSimAppProjectLib)

if (ENABLE_COPY_QT_LIBS AND WIN32)
    find_package(qtdlls)
endif(ENABLE_COPY_QT_LIBS AND WIN32)

endif (ENABLE_QT_SimApp_GUI)