[人工智能]cmake学习（三）

cmake学习（三）

调用第三方库，例如OpenCV

这里用的是opencv 4.5.3版本的

#include<iostream>
#include "opencv4/opencv2/opencv.hpp"

using namespace cv;
using namespace std;
int main()
{
    cv::VideoCapture cap;
    cap.open(0);
    while(true)
    {
        cv::Mat frame;
        cap >> frame;
        imshow("1",frame);
        if (waitKey(10) == 'q')
            break;
    }
    return 0;
}

写法1

cmake_minimum_required(VERSION 3.16)
project(demo3)

include_directories(/usr/local/include/opencv4)  # 包含头文件所在的路径
include_directories(/usr/local/include/opencv4/opencv2)  # 包含头文件所在的路径
link_directories(/usr/local/lib)   # 链接库文件所在的路径

add_executable(opencv_demo main.cpp)
target_link_libraries(opencv_demo opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs)  # 链接相应的库

写法2

cmake_minimum_required(VERSION 3.16)
project(demo3)

include_directories(/usr/local/include/opencv4)
include_directories(/usr/local/include/opencv4/opencv2)

set(lib_path /usr/local/lib)
link_directories(${lib_path})
file(GLOB LIBS "${lib_path}/libopencv*.so")  # 使用通配符找到所有的库，一次全部添加

add_executable(opencv_demo main.cpp)
target_link_libraries(opencv_demo ${LIBS})

写法3

cmake_minimum_required(VERSION 3.16)
project(demo3)

find_package(OpenCV REQUIRED core highgui imgproc imgcodecs)
if (OPENCV_FOUND)
    message(STATUS "找到OpenCV:\"${OpenCV_INCLUDE_DIRS}\",ENABLE_OPENCV宏已打开")
    message(STATUS "找到OpenCV:\"${OpenCV_LIBS}\"")
    include_directories(${OpenCV_INCLUDE_DIRS})
    add_definitions(-DENABLE_OPENCV)
    list(APPEND LINK_LIB_LIST ${OpenCV_LIBS})
    message(${LINK_LIB_LIST})
endif (OPENCV_FOUND)
add_executable(opencv_demo main.cpp)
target_link_libraries(opencv_demo ${OpenCV_LIBS})