mirror of
https://github.com/opencv/opencv.git
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157 lines
3.6 KiB
C++
157 lines
3.6 KiB
C++
/*
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* filestorage_sample demonstrate the usage of the opencv serialization functionality
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*/
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#include "opencv2/core/core.hpp"
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#include <iostream>
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#include <string>
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using std::string;
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using std::cout;
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using std::endl;
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using std::cerr;
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using std::ostream;
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using namespace cv;
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void help(char** av)
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{
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cout << "\nfilestorage_sample demonstrate the usage of the opencv serialization functionality.\n"
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<< "usage:\n"
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<< av[0] << " outputfile.yml.gz\n"
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<< "\n outputfile above can have many different extenstions, see below."
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<< "\nThis program demonstrates the use of FileStorage for serialization, that is use << and >> in OpenCV\n"
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<< "For example, how to create a class and have it serialize, but also how to use it to read and write matrices.\n"
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<< "FileStorage allows you to serialize to various formats specified by the file end type."
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<< "\nYou should try using different file extensions.(e.g. yaml yml xml xml.gz yaml.gz etc...)\n" << endl;
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}
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struct MyData
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{
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MyData() :
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A(0), X(0), id()
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{
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}
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explicit MyData(int) :
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A(97), X(CV_PI), id("mydata1234")
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{
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}
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int A;
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double X;
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string id;
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void write(FileStorage& fs) const //Write serialization for this class
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{
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fs << "{" << "A" << A << "X" << X << "id" << id << "}";
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}
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void read(const FileNode& node) //Read serialization for this class
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{
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A = (int)node["A"];
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X = (double)node["X"];
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id = (string)node["id"];
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}
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};
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//These write and read functions must exist as per the inline functions in operations.hpp
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void write(FileStorage& fs, const std::string&, const MyData& x){
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x.write(fs);
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}
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void read(const FileNode& node, MyData& x, const MyData& default_value = MyData()){
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if(node.empty())
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x = default_value;
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else
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x.read(node);
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}
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ostream& operator<<(ostream& out, const MyData& m){
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out << "{ id = " << m.id << ", ";
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out << "X = " << m.X << ", ";
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out << "A = " << m.A << "}";
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return out;
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}
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int main(int ac, char** av)
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{
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if (ac != 2)
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{
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help(av);
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return 1;
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}
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string filename = av[1];
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//write
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{
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FileStorage fs(filename, FileStorage::WRITE);
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cout << "writing images\n";
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fs << "images" << "[";
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fs << "image1.jpg" << "myfi.png" << "baboon.jpg";
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cout << "image1.jpg" << " myfi.png" << " baboon.jpg" << endl;
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fs << "]";
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cout << "writing mats\n";
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Mat R =Mat_<double>::eye(3, 3),T = Mat_<double>::zeros(3, 1);
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cout << "R = " << R << "\n";
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cout << "T = " << T << "\n";
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fs << "R" << R;
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fs << "T" << T;
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cout << "writing MyData struct\n";
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MyData m(1);
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fs << "mdata" << m;
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cout << m << endl;
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}
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//read
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{
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FileStorage fs(filename, FileStorage::READ);
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if (!fs.isOpened())
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{
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cerr << "failed to open " << filename << endl;
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help(av);
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return 1;
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}
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FileNode n = fs["images"];
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if (n.type() != FileNode::SEQ)
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{
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cerr << "images is not a sequence! FAIL" << endl;
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return 1;
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}
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cout << "reading images\n";
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FileNodeIterator it = n.begin(), it_end = n.end();
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for (; it != it_end; ++it)
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{
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cout << (string)*it << "\n";
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}
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Mat R, T;
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cout << "reading R and T" << endl;
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fs["R"] >> R;
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fs["T"] >> T;
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cout << "R = " << R << "\n";
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cout << "T = " << T << endl;
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MyData m;
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fs["mdata"] >> m;
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cout << "read mdata\n";
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cout << m << endl;
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cout << "attempting to read mdata_b\n"; //Show default behavior for empty matrix
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fs["mdata_b"] >> m;
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cout << "read mdata_b\n";
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cout << m << endl;
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}
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cout << "Try opening " << filename << " to see the serialized data." << endl;
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return 0;
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}
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