How can I get the list of files in a directory using C or C++?

Question

How can I determine the list of files in a directory from inside my C or C++ code?

I\'m not allowed to execute the ls command and parse the results from

Answer 1

This works for me. I'm sorry if I cannot remember the source. It is probably from a man page.

#include 

int AnalizeDirectoryElement (const char *fpath, 
                            const struct stat *sb,
                            int tflag, 
                            struct FTW *ftwbuf) {

  if (tflag == FTW_F) {
    std::string strFileName(fpath);

    DoSomethingWith(strFileName);
  }
  return 0; 
}

void WalkDirectoryTree (const char * pchFileName) {

  int nFlags = 0;

  if (nftw(pchFileName, AnalizeDirectoryElement, 20, nFlags) == -1) {
    perror("nftw");
  }
}

int main() {
  WalkDirectoryTree("some_dir/");
}