List all image files (jpeg) in a specific folder.

list_image_files_in_directory.cpp

#include <string>
#include <iostream>
#include <boost/filesystem.hpp>
#include <boost/algorithm/string.hpp>

using namespace boost::filesystem;
using std::endl;
using std::cout;
using std::cerr;

int main(int argc, char* argv[]) {

	path p(argv[1]);

	try {
		if (exists(p)) {
			if (!is_directory(p)) {
				cerr << "Please specify a valid directory." << endl;
				return 1;
			}
			else {
				cout << p << " is a directory containing:\n\n";

				directory_iterator end_iter;	// the default constructor creates the "end" iterator
				for (directory_iterator dir_iter(p); dir_iter != end_iter;	++dir_iter) {
					if (is_regular_file(dir_iter->status())) {
						String filename = boost::to_lower_copy(dir_iter->path().string());
						if (filename.find("jpg") != String::npos) {
							cout << dir_iter->path().filename() << endl;
							cout << filename << endl;
						}
					}
				}
			}
		}
		else {
			cerr << "Directory " << p << " does not exist!\n";
			return 1;
		}
	} catch (const filesystem_error &ex) {
		cerr << ex.what() << endl;
	}

        return 0;
}