Windows下 CLion中，配置 OpenCV、LibTorch

首先按照win下C++部署深度学习模型之clion配置pytorch+opencv教程记录 步骤配置。

LibTorch 部分

在测试LibTorch时会出现类似 c10.dll not found 的问题（Debug才有）：

参考C++部署Pytorch（Libtorch）出现问题、错误汇总和
如何在windows10上使用cmake配置libtorch（vs2022版）

主要是MSVC 需要这些 dll文件 。 可以如下修改CmakeList.txt让它找到：

cmake_minimum_required(VERSION 3.12)
project(opencv_test)

set(CMAKE_CXX_STANDARD 17)

#set(CMAKE_PREFIX_PATH C:/Libraries/libtorch-win-shared-with-deps-2.3.0+cu118/libtorch)
list(APPEND CMAKE_PREFIX_PATH C:/Libraries/libtorch-win-shared-with-deps-2.3.0+cu118/libtorch)		# 这里指定的话不必将Torch的路径加入环境变量
#set(Torch_DIR "E:/libtorch/share/cmake/Torch")
#include_directories("E:/libtorch/include")
#include_directories("E:/libtorch/include/torch/csrc/api/include")
find_package(Torch REQUIRED)
message(STATUS "torch status: ${TORCH_FOUND}")
message(STATUS "torch library: ${TORCH_LIBRARIES}")
message(STATUS "TORCH_INSTALL_PREFIX: ${TORCH_INSTALL_PREFIX}")


add_executable(opencv_test main.cpp)
target_link_libraries(opencv_test ${TORCH_LIBRARIES})

if (MSVC)
    file(GLOB TORCH_DLLS "${TORCH_INSTALL_PREFIX}/lib/*.dll")
    add_custom_command(TARGET opencv_test
            POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy_if_different
            ${TORCH_DLLS}
            $<TARGET_FILE_DIR:opencv_test>)
endif (MSVC)

if (CMAKE_VERSION VERSION_GREATER 3.12)
    set_property(TARGET opencv_test PROPERTY CXX_STANDARD 17)
endif()

OpenCV 部分

clion编译OpenCV时，install的位置在这（更多参考）：

不能用clion编译，还是会出现找不到 dll文件的问题！！！

参考如下链接用VS编译：

Windows 下使用 CMake + Visual Studio 2022 编译 OpenCV 4.8.1 及其扩展模块 （主要参考）

vs2019编译opencv

注： Opencv_world勾选后后面build可能会出问题，不知道怎么解决建议别勾。

之后记得把 D:\prj\opencv\opencv4\out\install\x64-Debug\x64\vc17\bin添加到环境变量。

之后在camke时你可能又出现了问题：

CMake Warning at C:/Libraries/opencv-4.8.1/cmake-build-release/install/OpenCVConfig.cmake:190 (message):
  Found OpenCV Windows Pack but it has no binaries compatible with your
  configuration.

  You should manually point CMake variable OpenCV_DIR to your build of OpenCV
  library.
Call Stack (most recent call first):
  CMakeLists.txt:8 (find_package)


CMake Error at CMakeLists.txt:8 (find_package):
  Found package configuration file:

    C:/Libraries/opencv-4.8.1/cmake-build-release/install/OpenCVConfig.cmake

  but it set OpenCV_FOUND to FALSE so package "OpenCV" is considered to be
  NOT FOUND.

这是因为OpenCV_DIR 应当精确到lib！！！ 故意的还是不小心的？？？

set(OpenCV_DIR C:/Libraries/opencv-4.8.1/cmake-build-release/install/lib)

完整工程文件

CmakeList.txt

cmake_minimum_required(VERSION 3.12)
project(opencv_test)
set(CMAKE_CXX_STANDARD 17)

set(CMAKE_BUILD_TYPE "Release")


set(OpenCV_DIR C:/Libraries/opencv-4.8.1/build/install/lib)  # 这里要精确到lib！
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
message(STATUS "OpenCV status:" ${OpenCV_FOUND})
message(STATUS "OpenCV Libs:" ${OpenCV_LIBS})


set(CMAKE_PREFIX_PATH C:/Libraries/libtorch-win-shared-with-deps-2.3.0+cu118/libtorch)
#set(Torch_DIR "E:/libtorch/share/cmake/Torch")
#include_directories("E:/libtorch/include")
#include_directories("E:/libtorch/include/torch/csrc/api/include")
find_package(Torch REQUIRED)
message(STATUS "torch status: ${TORCH_FOUND}")
message(STATUS "torch library: ${TORCH_LIBRARIES}")
message(STATUS "TORCH_INSTALL_PREFIX: ${TORCH_INSTALL_PREFIX}")



add_executable(opencv_test main.cpp)
target_link_libraries(opencv_test
        ${TORCH_LIBRARIES}
        ${OpenCV_LIBS}
)

if (MSVC)
    file(GLOB TORCH_DLLS "${TORCH_INSTALL_PREFIX}/lib/*.dll")
    file(GLOB OpenCV_DLLS "${OpenCV_DIR}/../bin/*.dll")
    add_custom_command(TARGET opencv_test
            POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy_if_different
            ${TORCH_DLLS} ${OpenCV_DLLS}
            $<TARGET_FILE_DIR:opencv_test>)
endif (MSVC)

main.cpp

#include <iostream>
#include <torch/script.h>
#include <torch/torch.h>

#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>



void test_libtorch_version() {
    if (torch::cuda::cudnn_is_available())
    {
        std::cout << "cuDNN is available." << std::endl;
    }
    else
    {
        std::cout << "cuDNN is not available." << std::endl;
    }
    if (torch::cuda::is_available())
    {
        std::cout << "CUDA is available." << std::endl;
    }
    else
    {
        std::cout << "CUDA is not available." << std::endl;
    }
    std::cout << "Device count : " << torch::cuda::device_count() << std::endl;

}

int main(int, char**)  {
    torch::Tensor a = torch::rand({2, 3});
    std::cout << a << std::endl;


    test_libtorch_version();
    torch::Tensor b = torch::randint(10, 20, { 3, 2 });
    std::cout << b << std::endl;


    std::string path = "C:\\Users\\THM\\Documents\\Projects\\test_openvins_py\\data\\coco_bike.jpg";
    cv::Mat im = cv::imread(path);
    cv::imshow("image", im);
    cv::waitKey(0);
    return 0;
}

还有问题！ -- 不能debug？？？

是的，上面只是编译了OpenCV的Release版本，想要debug你还得编译一遍debug版的！

怎么编呢？

你应该记得我们在编译时，将VS的编译模式改成了release模式，现在只需要调回debug模式，

然后再分别Build ALL_BUILD和INSTALL即可。

期间会遇到的编译问题是：

Debug build error: LNK1104: cannot open file 'python311_d.lib'

不会有人还装了debug版的python吧？！

如果你也没有，可以参照论坛， 找到你python路径下的PATH_TO_PYTHON_DIST/include/pyconfig.h, 修改：

pragma comment(lib,"pythonxx_d.lib")

to

pragma comment(lib,"pythonxx.lib")

and

#       define Py_DEBUG

to

//#       define Py_DEBUG

还是不行？？？

另外创建一个转为debug而设置的文件夹build_debug，从Cmake开始再重走一遍流程。

最后可将build_debug里的东西复制到之前的build文件夹内（重复文件直接跳过）。

当然不嫌麻烦的话不复制也行，可以在CMakeList.txt里根据CMAKE_BUILD_TYPE指定对应build内的lib。

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