【OpenREALM学习笔记：7】自己编写的读取原作者数据集航向角的程序

本文链接：https://blog.youkuaiyun.com/weixin_43468458/article/details/137977664

这篇文章详细描述了一个C++项目，使用了Exiv2库处理图像元数据，包括XMP键查找和Boost库的文件系统操作，同时通过CMake进行配置管理。

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代码内容：

#include <iostream>
#include <exiv2/exiv2.hpp>
#include <boost/filesystem.hpp>

std::string FindXmpKey(Exiv2::XmpData &xmpData, const std::string &key) {
   
    if (xmpData.findKey(Exiv2::XmpKey(key)) != xmpData.end())
        return xmpData[key].toString();
    else
        return "";
}

void readFilenamesBoost(std::vector<std::string> &filenames, const std::string &folder) {
   
    boost::filesystem::path directory(folder);
    boost::filesystem::directory_iterator itr(directory), end_itr;
    std::string current_file = itr->path().string();

    for (; itr != end_itr; ++itr) {
   
        if (boost::filesystem::is_regular_file(itr->path())) {
   
            std::string filename = itr->path().filename().string();
            filenames.push_back(filename);
        }
    }
}

int main() {
   
    std::string folder = "/home/wanghui/Datasets/edm_big_overlap_50p/";
    std::vector<std::string> filenames;

    readFilenamesBoost(filenames, folder);
    std::sort(filenames.begin(), filenames.end());
    for (auto &filename: filenames) {
   
        auto image = Exiv2::ImageFactory::open(folder + filename);
        image->readMetadata();
        Exiv2::ExifData &exifData = image->exifData();
        Exiv2::XmpData &xmp_data = image->xmpData();
        std::cout << "File: " << filename << ", ";
        std::cout << "REALM.Heading: " << FindXmpKey(xmp_data, "Xmp.exif.REALM.Heading") << std::endl;
    }
}

CMakelists.txt

cmake_minimum_required(VERSION 3.28)
project(readexiv2)

set(CMAKE_CXX_STANDARD 17)

list(APPEND CMAKE_MODULE_PATH ${
   CMAKE_CURRENT_SOURCE_DIR})

find_package(Boost REQUIRED)

find_package(Exiv2 REQUIRED)

include_directories(${
   Exiv2_INCLUDE_DIRS})

add_executable(readexiv2 main.cpp)

target_link_libraries(readexiv2 ${
   Exiv2_LIBRARIES} -lboost_system -lboost_filesystem)

FindExiv2.cmake

# - Find the native exiv2 includes and library
#
# This module defines
#  EXIV2_INCLUDE_DIR, where to find png.h, etc.
#  EXIV2_LIBRARIES, the libraries to link against to use exiv2
#  EXIV2_FOUND, If false, do not try to use exiv2
# also defined, but not for general use are
#  EXIV2_LIBRARY, where to find the exiv2 library

#===================================================================&#