Loading an image from a folder using OpenCV 3.0 in Windows - c++

Question

I am using Visual Studio 2010, with OpenCV 3.0. I'm trying to load some images from a folder but I am having problems.
Firstly I did not have the file dirent.h, so I downloaded it in order to get the DIR* and "dirent*" structures to access to the files. All seems to be well, but now when I get to the line
string fileName = in_file->d_name;
I have found that I don't access to the name of the file.
Anyone have any thoughts on this?
This is the code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <opencv2/core/dirent.h>
#ifdef _WIN32
#include <io.h>
#else
#include <unistd.h>
#endif
#include <conio.h>
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>
#pragma comment(lib, "User32.lib")
#include <errno.h>
#include <iostream>
#include <time.h>
#include <limits.h>
#include <fstream>
#include <sys/stat.h>
#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/ml.hpp>
#include <opencv2/opencv.hpp>
using namespace cv;
using namespace cv::ml;
using namespace std;
int patchWidth = 15;
int patchHeight = 15;
int main(int, char**)
{
string imagesPath = "Images";
string resultsPath = "Patches";
DIR* FD;
struct dirent* in_file;
if (NULL == (FD = opendir (imagesPath.c_str())))
{
fprintf(stderr, "Error : Failed to open input directory\n");
return 0;
}
while ((in_file = readdir(FD)))
{
/* On linux/Unix we don't want current and parent directories
* If you're on Windows machine remove this two lines
*/
// if (!strcmp (in_file->d_name, "."))
// continue;
// if (!strcmp (in_file->d_name, ".."))
// continue;
/* Open directory entry file for common operation */
/* TODO : change permissions to meet your need! */
string fileName = in_file->d_name;
string pathFile = imagesPath;
pathFile.append("/");
pathFile.append(fileName);
//pathFile.append(".jpg");
Mat img = imread(pathFile.c_str());
Thanks in advance.

Answer 1

for a much simpler solution, just use cv::glob :
String imagesPath = "Images/*.png"; // it has filters, too !
vector<String> fn;
glob(path, fn, true); // recursive, if you want
for (size_t i=0; i<fn.size(); i++)
{
Mat img = imread(fn[i]);
...
}