使用XML和YAML文件的文件输入和输出

最新推荐文章于 2024-03-28 10:16:58 发布

philosophia_OsO

最新推荐文章于 2024-03-28 10:16:58 发布

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分类专栏： OpenCV

本文链接：https://blog.youkuaiyun.com/weixin_42715287/article/details/107868855

版权

本文详细介绍了如何使用OpenCV进行XML和YAML文件的输入输出操作，包括文件打开关闭、基本类型和OpenCV数据结构的读写，以及自定义数据结构的序列化方法。示例代码涵盖C++和Python两种语言，展示了如何处理序列和映射类型的输入输出。

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英文链接：File Input and Output using XML and YAML files

文章目录

- 目标
- 源码
- 解释
- 结果

目标

如何打印和读取文本条目到文件和 OpenCV使用YAML或XML文件?
如何为OpenCV数据结构做同样的事情?
如何为你的数据结构做到这一点?
使用OpenCV数据结构，如cv::FileStorage, cv::FileNode或cv::FileNodeIterator。

源码

#include <opencv2/core.hpp>
#include <iostream>
#include <string>
using namespace cv;
using namespace std;
static void help(char** av)
{
   
    cout << endl
        << av[0] << " shows the usage of the OpenCV serialization functionality."         << endl
        << "usage: "                                                                      << endl
        <<  av[0] << " outputfile.yml.gz"                                                 << endl
        << "The output file may be either XML (xml) or YAML (yml/yaml). You can even compress it by "
        << "specifying this in its extension like xml.gz yaml.gz etc... "                  << endl
        << "With FileStorage you can serialize objects in OpenCV by using the << and >> operators" << endl
        << "For example: - create a class and have it serialized"                         << endl
        << "             - use it to read and write matrices."                            << endl;
}
class MyData
{
   
public:
    MyData() : A(0), X(0), id()
    {
   }
    explicit MyData(int) : A(97), X(CV_PI), id("mydata1234") // explicit to avoid implicit conversion
    {
   }
    void write(FileStorage& fs) const                        //Write serialization for this class
    {
   
        fs << "{" << "A" << A << "X" << X << "id" << id << "}";
    }
    void read(const FileNode& node)                          //Read serialization for this class
    {
   
        A = (int)node["A"];
        X = (double)node["X"];
        id = (string)node["id"];
    }
public:   // Data Members
    int A;
    double X;
    string id;
};
//These write and read functions must be defined for the serialization in FileStorage to work
static void write(FileStorage& fs, const std::string&, const MyData& x)
{
   
    x.write(fs);
}
static void read(const FileNode& node, MyData& x, const MyData& default_value = MyData()){
   
    if(node.empty())
        x = default_value;
    else
        x.read(node);
}
// This function will print our custom class to the console
static ostream& operator<<(ostream& out, const MyData& m)
{
   
    out << "{ id = " << m.id << ", ";
    out << "X = "