libigl_Martin/tutorial/601_Serialization/main.cpp

#include <igl/readOFF.h>
#include <igl/serialize.h>
#include <igl/xml/serialize_xml.h>
#include <iostream>

Eigen::MatrixXd V;
Eigen::MatrixXi F;

// derive from igl::Serializable to serialize your own type
struct State : public igl::Serializable
{
  Eigen::MatrixXd V;
  Eigen::MatrixXi F;
  std::vector<int> ids;

  // You have to define this function to
  // register the fields you want to serialize
  void InitSerialization()
  {
    this->Add(V  , "V");
    this->Add(F  , "F");
    this->Add(ids, "ids");
  }
};

// alternatively you can do it like the following to have
// a non-intrusive serialization:
//
// struct State
// {
//   Eigen::MatrixXd V;
//   Eigen::MatrixXi F;
//   std::vector<int> ids;
// };
// 
// SERIALIZE_TYPE(State,
//  SERIALIZE_MEMBER(V)
//   SERIALIZE_MEMBER(F)
//   SERIALIZE_MEMBER_NAME(ids,"ids")
// )

int main(int argc, char *argv[])
{
  std::string binaryFile = "binData";
  std::string xmlFile = "data.xml";

  bool b = true;
  unsigned int num = 10;
  std::vector<float> vec = {0.1f,0.002f,5.3f};

  // use overwrite = true for the first serialization to create or overwrite an existing file
  igl::serialize(b,"B",binaryFile,true);
  // append following serialization to existing file
  igl::serialize(num,"Number",binaryFile);
  igl::serialize(vec,"VectorName",binaryFile);

  // deserialize back to variables
  igl::deserialize(b,"B",binaryFile);
  igl::deserialize(num,"Number",binaryFile);
  igl::deserialize(vec,"VectorName",binaryFile);

  State stateIn, stateOut;

  // Load a mesh in OFF format
  igl::readOFF("../shared/2triangles.off",stateIn.V,stateIn.F);

  // Save some integers in a vector
  stateIn.ids.push_back(6);
  stateIn.ids.push_back(7);

  // Serialize the state of the application
  igl::serialize(stateIn,"State",binaryFile,true);

  // Load the state from the same file
  igl::deserialize(stateOut,"State",binaryFile);

  // Plot the state
  std::cout << "Vertices: " << std::endl << stateOut.V << std::endl;
  std::cout << "Faces:    " << std::endl << stateOut.F << std::endl;
  std::cout << "ids:      " << std::endl
            << stateOut.ids[0] << " " << stateOut.ids[1] << std::endl;
			
  // XML serialization
  
  // binary = false, overwrite = true
  igl::xml::serialize_xml(vec,"VectorXML",xmlFile,false,true);
  // binary = true, overwrite = false
  igl::xml::serialize_xml(vec,"VectorBin",xmlFile,true,false);
  igl::xml::deserialize_xml(vec,"VectorXML",xmlFile);
  igl::xml::deserialize_xml(vec,"VectorBin",xmlFile);
}