（Windows）VS2017下编译FLANN1.8.4

#include <iostream>
#include <flann/flann.hpp>
#include <flann/io/hdf5.h>
#include <stdio.h>

using namespace flann;

int main(int argc, char** argv)
{
    int nn = 3;

    Matrix<float> dataset;
    Matrix<float> query;
    load_from_file(dataset, "dataset.hdf5", "dataset");
    load_from_file(query, "dataset.hdf5", "query");

    Matrix<int> indices(new int[query.rows*nn], query.rows, nn);
    Matrix<float> dists(new float[query.rows*nn], query.rows, nn);

    // construct an randomized kd-tree index using 4 kd-trees
    Index<L2<float> > index(dataset, flann::KDTreeIndexParams(4));
    index.buildIndex();

    // do a knn search, using 128 checks
    index.knnSearch(query, indices, dists, nn, flann::SearchParams(128));

    for (int i = indices.rows; i < indices.rows; i++)
    {
        for (int j = 0; j < indices.cols; j++)
        {
            std::cout << indices[i][j] << " ";
        }
        std::cout << std::endl;
    }
    std::cout << "index size: " << index.size() << std::endl;
    std::cout << std::endl;

    flann::save_to_file(indices, "result.hdf5", "result");

    delete[] dataset.ptr();
    delete[] query.ptr();
    delete[] indices.ptr();
    delete[] dists.ptr();

    return 0;
}