Comparing 2 strings to exclude based on extention

Ive had a look at this post: Find if string ends with another string in C++

I am trying to achieve a similar goal.

Basically i want to take a file list from a directory and filter out any files which do not end with a specified allowed extention for processing in my program.

In java this would be performed by creating a method and passing the extention accross as a string then using .endswith in th开发者_Go百科e following statement. C++ does not appear to support this so how would i go about it?

   for (int fileList = 0; fileList < files.length; fileList++)
   {
      //output only jpg files, file list is still full
      if(files[fileList].toString().endsWith(extension))
      {
          images.add(files[fileList]);
      }//end if
   }//end for

Thanks in advance

---

bool endsWith(std::string const & s, std::string const & e) {
    if (s.size() < e.size())
        return false;
    return s.substr(s.size() - e.size()) == e;
}

---

If using boost::filesystem is ok for you then you could try

#include <boost/filesystem.hpp>
//...

boost::filesystem::path dir_path ("c:\\dir\\subdir\\data");
std::string extension(".jpg");
for (boost::filesystem::directory_iterator it_file(dir_path);
     it_file != boost::filesystem::directory_iterator();
     ++it_file)
{
  if ( boost::filesystem::is_regular_file(*it_file) &&
       boost::filesystem::extension(*it_file) == extension)
  {
    // do your stuff
  }
}

This will parse the given directory path and you then just have to filter desired extension.t

---

Next example checks if the filename ends with the jpg extension :

#include <iostream>
#include <string>
using namespace std;


bool EndsWithExtension (const string& str,const string &extension)
{
    size_t found = str.find_last_of(".");
    if ( string::npos != found )
    {
        return (extension == str.substr(found+1) );
    }

    return false;
}

int main ()
{
  string filename1 ("c:\\windows\\winhelp.exe");
  string filename2 ("c:\\windows\\other.jpg");
  string filename3 ("c:\\windows\\winhelp.");

  cout << boolalpha << EndsWithExtension(filename1,"jpg") << endl;
  cout << boolalpha << EndsWithExtension(filename2,"jpg") << endl;
  cout << boolalpha << EndsWithExtension(filename3,"jpg") << endl;
}