vcpkg + Qt + Cmake + Visual Studio 2019

Question

我正在尝试使用

Qt6

安装

vcpkg

，并在

Visual Studio 2019 CMake project

中使用它。我尝试过链接其他库（例如：

fmt

）并且它有效。但是，当我在混合中添加

Qt

时，构建成功，但运行可执行文件失败:

弹出窗口显示：

Program ... QtCored.dll
...
This application failed to start because no Qt platform could be initialized
...

控制台显示

qt.qpa.plugin: Could not find the Qt platform plugin "windows" in "C:\vcpkg\installed\x64-windows\Qt6\plugins\platforms"
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

环境变量：我将

VCPKG_ROOT

设置为

C:\vcpkg

，

QT_PLUGIN_PATH

设置为

C:\vcpkg\installed\x64-windows\Qt6\plugins\platforms

，

QT_QPA_PLATFORM_PLUGIN_PATH

设置为

C:\vcpkg\installed\x64-windows\Qt6\plugins\platforms

，将

C:\vcpkg\installed\x64-windows\Qt6

和

C:\vcpkg

添加到路径中。

我尝试将exe放在一个单独的文件夹中，并在其上运行windeployqt.exe，但它也失败了......

windeployqt.exe C:\Users\broland\Desktop\NewFolder\HelloWorld.exe

Warning: Translations will not be available due to the following error.
Cannot open C:/vcpkg/installed/x64-windows/translations/Qt6/catalogs.json
Unable to find dependent libraries of C:\vcpkg\installed\x64-windows\bin\Qt6Widgetsd.dll :Cannot open 'C:/vcpkg/installed/x64-windows/bin/Qt6Widgetsd.dll': The system cannot find the file specified.

我的CMakeLists.txt：

cmake_minimum_required (VERSION 3.8)

set(CMAKE_AUTOMOC ON)  # https://stackoverflow.com/questions/14170770/unresolved-external-symbol-public-virtual-struct-qmetaobject-const-thiscal
set(CMAKE_INCLUDE_CURRENT_DIR ON)  # so that mainwindow.h and mainwindow.cpp is seen

project (HelloWorld)

find_package(fmt CONFIG REQUIRED)

find_package(Qt6Core REQUIRED)
find_package(Qt6Gui CONFIG REQUIRED)
find_package(Qt6Widgets REQUIRED)

add_executable (HelloWorld "helloworld.cpp" "helloworld.h" "mainwindow.cpp")
#add_executable (HelloWorld "mainwindow.cpp" "mainwindow.h" "mainwindow.cpp")

target_link_libraries(HelloWorld PRIVATE fmt::fmt)
target_link_libraries(HelloWorld PRIVATE Qt::Gui)
target_link_libraries(HelloWorld PRIVATE Qt::Core)
target_link_libraries(HelloWorld PRIVATE Qt::Widgets)

已经尝试了好几天了。有什么建议吗？

Answer 1

因此，我没有使用 vcpkg，而是通过在线安装程序安装了 Qt。

对于其他陷入困境的人，我将把它留在这里。我遵循了 this 和 this 教程的部分内容。

由于我使用Visual Studio，所以我下载了

MSVC 2019 64-bit

版本。我将环境变量

QTDIR

设置为等于

msvc2019_64

文件夹所在的路径。我添加到

Path

环境中。变种

%QTDIR%\lib

和

%QTDIR%\bin

。为了检查我是否可以链接其他

vcpkg

安装的库，我得到了

OpenCV

（

vcpkg install opencv

）。似乎有效。

INCLUDE

中的路径是我拥有各自文件的位置，ip、ua和var是我的项目的文件夹，其中包含源文件和头文件。

我的CMakeLists.txt：

cmake_minimum_required (VERSION 3.8)

project (OpenCBDependencyTest)

#some magic
set(CMAKE_AUTOMOC ON)
#set(CMAKE_INCLUDE_CURRENT_DIR ON)
INCLUDE(C:/vcpkg/scripts/buildsystems/vcpkg.cmake)  # so that vcpkg installed packages are seen


# find packages
find_package(Qt6Core REQUIRED)
find_package(Qt6Gui REQUIRED)
find_package(Qt6Widgets REQUIRED)

find_package(OpenCV REQUIRED)


# include files
set(IP_DIR "${CMAKE_SOURCE_DIR}/ip")
set(UA_DIR "${CMAKE_SOURCE_DIR}/ua")
set(VAR_DIR "${CMAKE_SOURCE_DIR}/var")

include_directories(${IP_DIR})
include_directories(${UA_DIR})
include_directories(${VAR_DIR})

file(GLOB_RECURSE SOURCES
    "${IP_DIR}/*.cpp"
    "${IP_DIR}/*.h"
    "${UA_DIR}/*.cpp"
    "${UA_DIR}/*.h"
    "${VAR_DIR}/*.cpp"
    "${VAR_DIR}/*.h"
    "Main.cpp"
)
add_executable (OpenCBDependencyTest ${SOURCES})


# link libraries
target_link_libraries(OpenCBDependencyTest Qt::Core)
target_link_libraries(OpenCBDependencyTest Qt::Gui)
target_link_libraries(OpenCBDependencyTest Qt::Widgets)

target_link_libraries(OpenCBDependencyTest ${OpenCV_LIBS})