读写XML和YML文件

学OpenCV

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读写XML和YML文件。

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用处？比方说标定完相机后，相关参数要保存一下，以便未来使用。

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#include <iostream>

#include <opencv2/opencv.hpp>
#include <opencv2/core/utils/logger.hpp>


void Test_write(std::string pathfile)
{
    cv::FileStorage file(pathfile, cv::FileStorage::WRITE);
    
    cv::Mat mat=cv::Mat::eye(3,3,CV_16UC2);

    file << "eye"<<mat;

    file.write("i", 100);
    file.write("d", 100.0);
    file.write("dd", 100.100);//dd: 100.09999999999999

    float d1 = 101.0;//不区分float和double
    file << "d1" << d1;
    double d2 = 101.0;
    file << "d2" << d1;

    std::string str1 = "str1";//不区分string和字符串常量
    file << "str1" << str1;
    file << "str2" << "str2";

    file << "arr1" << "["<<1 <<2 <<3 << "]";//不区分数组中数据类型
    file << "arr2" << "[" << 1 << "2" << 3 << "]";

    file << "yyyymmddarr" 
                     << "{" 
                     << "yyyy"<<2024
                     << "mm"<<8
                     << "dd"<<19
                     << "arr"<<"["
                                <<12<<34<<56
                             <<"]"
                     << "}";

    file.release();
}

void Test_read(std::string pathfile)
{
    cv::FileStorage file(pathfile, cv::FileStorage::READ);
    if (file.isOpened() == false)
    {
        std::cout << "open file failed."  << std::endl;
    }

    cv::Mat mat;
    file["eye"] >> mat;
    
    int i;
    file["i"] >> i;

    float f_d;
    double d_d;
    float f_dd;
    double d_dd;

    file["d"] >> f_d;
    file["d"] >> d_d;
    file["dd"] >> f_dd;
    file["dd"] >> d_dd;

    float d1;
    double d2;
    file["d1"] >> d1;
    file["d2"] >> d2;

    std::string str1;
    std::string str2;
    file["str1"] >> str1;
    file["str2"] >> str2;

    cv::FileNode arr1;
    arr1 = file["arr1"];
    for (cv::FileNodeIterator it = arr1.begin(); it != arr1.end(); it++)
    {
        int i = 0;
        int j = 0;
        
        *it >> i;
        j = *it;

        std::cout << i <<" " << j << std::endl;
    }

    int l = arr1.size();
    for (int i = 0; i < l; i++)
    {
        int v = 0;
        
        v=file["arr1"][i];

        std::cout << v << std::endl;
    }

    //这个有点特别，写入时不区分，怎么读取呢？
    //经实验，可以强行解释转换，但数据是不对的。
    cv::FileNode arr2;
    arr2 = file["arr2"];
    for (cv::FileNodeIterator it = arr2.begin(); it != arr2.end(); it++)
    {
        int i = 0;
        int j = 0;

        *it >> i;
        j = *it;

        std::cout << i << " " << j << std::endl;
    }

    int i1=file["arr2"][0];
    std::string stra2=file["arr2"][1];
    int i2=file["arr2"][2];
    std::cout <<i1<<" "<<stra2 <<" " <<i2 << std::endl;
    
    cv::FileNode ext=file["yyyymmddarr"];
    int iyyyy=ext["yyyy"];
    int imm = ext["mm"];
    int idd = ext["dd"];
    int hh = ext["arr"][0];
    int min = ext["arr"][1];
    int sec = ext["arr"][2];
    std::cout << iyyyy << "-" << imm << "-" << idd <<" "<<hh<<":"<<min<<":"<<sec << std::endl;

    cv::waitKey();
}


int main()
{
    cv::utils::logging::setLogLevel(cv::utils::logging::LOG_LEVEL_ERROR);
    
    Test_write(R"(C:\ProjectHome\test\LeanOpenCV\Test_XML_YML\test.yml)");
    Test_read(R"(C:\ProjectHome\test\LeanOpenCV\Test_XML_YML\test.yml)");
    std::cout <<"======" << std::endl;
    Test_write(R"(C:\ProjectHome\test\LeanOpenCV\Test_XML_YML\test.xml)");
    Test_read(R"(C:\ProjectHome\test\LeanOpenCV\Test_XML_YML\test.xml)");

    cv::waitKey(0);

    return 0;
}


#if 0
% YAML:1.0
-- -
eye : !!opencv - matrix
rows : 3
cols : 3
dt : "2w"
data : [1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0]
i : 100
d : 100.
dd : 100.09999999999999
d1 : 101.
d2 : 101.
str1 : str1
str2 : str2
arr1 :
-1
- 2
- 3
arr2 :
    -1
    - "2"
    - 3
    yyyymmddarr :
    yyyy : 2024
    mm : 8
    dd : 19
    arr :
    -12
    - 34
    - 56

#endif

#if 0
< ? xml version = "1.0" ? >
<opencv_storage>
<eye type_id = "opencv-matrix">
< rows>3 < / rows >
< cols>3 < / cols >
< dt>"2w" < / dt >
< data>
1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 < / data > < / eye>
< i>100 < / i >
< d>100. < / d >
< dd>100.09999999999999 < / dd >
< d1>101. < / d1 >
< d2>101. < / d2 >
<str1>str1< / str1>
<str2>str2< / str2>
< arr1>
1 2 3 < / arr1 >
< arr2>
1 "2" 3 < / arr2 >
<yyyymmddarr>
< yyyy>2024 < / yyyy >
< mm>8 < / mm >
< dd>19 < / dd >
< arr>
12 34 56 < / arr > < / yyyymmddarr>
< / opencv_storage>

#endif


#if 0
1 1
2 2
3 3
1
2
3
1 1
2147483647 2147483647
3 3
1 2 3
2024 - 8 - 19 12:34 : 56
======
1 1
2 2
3 3
1
2
3
1 1
2147483647 2147483647
3 3
1 2 3
2024 - 8 - 19 12:34 : 56

C : \ProjectHome\test\LeanOpenCV\x64\Debug\Test_XML_YML.exe(进程 7568)已退出，代码为 0 (0x0)。
要在调试停止时自动关闭控制台，请启用“工具”->“选项”->“调试”->“调试停止时自动关闭控制台”。
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#endif