opencv中xml/yml文件操作类

opencv有关xml/yml/json帮助文档：opencv
下面是官方给出的一个示例，通过使用和修改来学习这方面的知识吧。
可以看到这个

创建一个新的VS工程，把代码复制进去，配置好opencv

点击调试->调试属性

调试->命令参数，填入一个yml文件

点击调试

生成yml文件，打开内容和我们程序内设置的一样

下面是源码：

/** filestorage_sample demonstrate the usage of the opencv serialization functionality*/#include "opencv2/core.hpp"
#include <iostream>
#include <string>using std::string;
using std::cout;
using std::endl;
using std::cerr;
using std::ostream;
using namespace cv;static void help(char** av)
{cout << "\nfilestorage_sample demonstrate the usage of the opencv serialization functionality.\n"<< "usage:\n"<<  av[0] << " outputfile.yml.gz\n"<< "\n   outputfile above can have many different extensions, see below."<< "\nThis program demonstrates the use of FileStorage for serialization, that is in use << and >>  in OpenCV\n"<< "For example, how to create a class and have it serialize, but also how to use it to read and write matrices.\n"<< "FileStorage allows you to serialize to various formats specified by the file end type."<< "\nYou should try using different file extensions.(e.g. yaml yml xml xml.gz yaml.gz etc...)\n" << endl;
}struct MyData
{MyData() :A(0), X(0), id(){}explicit MyData(int) :A(97), X(CV_PI), id("mydata1234"){}int A;double X;string id;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"];}
};//These write and read functions must exist as per the inline functions in operations.hpp
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;elsex.read(node);
}static ostream& operator<<(ostream& out, const MyData& m){out << "{ id = " << m.id << ", ";out << "X = " << m.X << ", ";out << "A = " << m.A << "}";return out;
}
int main(int ac, char** av)
{cv::CommandLineParser parser(ac, av,"{@input||}{help h ||}");if (parser.has("help")){help(av);return 0;}string filename = parser.get<string>("@input");if (filename.empty()){help(av);return 1;}//write{FileStorage fs(filename, FileStorage::WRITE);cout << "writing images\n";fs << "images" << "[";fs << "image1.jpg" << "myfi.png" << "baboon.jpg";cout << "image1.jpg" << " myfi.png" << " baboon.jpg" << endl;fs << "]";cout << "writing mats\n";Mat R =Mat_<double>::eye(3, 3),T = Mat_<double>::zeros(3, 1);cout << "R = " << R << "\n";cout << "T = " << T << "\n";fs << "R" << R;fs << "T" << T;cout << "writing MyData struct\n";MyData m(1);fs << "mdata" << m;cout << m << endl;}//read{FileStorage fs(filename, FileStorage::READ);if (!fs.isOpened()){cerr << "failed to open " << filename << endl;help(av);return 1;}FileNode n = fs["images"];if (n.type() != FileNode::SEQ){cerr << "images is not a sequence! FAIL" << endl;return 1;}cout << "reading images\n";FileNodeIterator it = n.begin(), it_end = n.end();for (; it != it_end; ++it){cout << (string)*it << "\n";}Mat R, T;cout << "reading R and T" << endl;fs["R"] >> R;fs["T"] >> T;cout << "R = " << R << "\n";cout << "T = " << T << endl;MyData m;fs["mdata"] >> m;cout << "read mdata\n";cout << m << endl;cout << "attempting to read mdata_b\n";   //Show default behavior for empty matrixfs["mdata_b"] >> m;cout << "read mdata_b\n";cout << m << endl;}cout << "Try opening " << filename << " to see the serialized data." << endl << endl;//read from string{cout << "Read data from string\n";string dataString ="%YAML:1.0\n""mdata:\n""   A: 97\n""   X: 3.1415926535897931e+00\n""   id: mydata1234\n";MyData m;FileStorage fs(dataString, FileStorage::READ | FileStorage::MEMORY);cout << "attempting to read mdata_b from string\n";   //Show default behavior for empty matrixfs["mdata"] >> m;cout << "read mdata\n";cout << m << endl;}//write to string{cout << "Write data to string\n";FileStorage fs(filename, FileStorage::WRITE | FileStorage::MEMORY | FileStorage::FORMAT_YAML);cout << "writing MyData struct\n";MyData m(1);fs << "mdata" << m;cout << m << endl;string createdString = fs.releaseAndGetString();cout << "Created string:\n" << createdString << "\n";}return 0;
}

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