C++ How to search files in a directory with certain name? -

i want find files start words. example abc , abc22424 , abc44646, abc353535 found on other question. please me. new in c++

#include <sys/types.h> #include <dirent.h> #include <errno.h> #include <vector> #include <string> #include <iostream>  using namespace std;  int getdir (string dir, vector<string> &files) {     dir *dp;     struct dirent *dirp;      if((dp = opendir(dir.c_str())) == null)     {       cout << "error(" << errno << ") opening " << dir << endl;       return errno;     }     while ((dirp = readdir(dp)) != null)       files.push_back(string(dirp->d_name));     closedir(dp);     return 0; }  int main() {     string dir = string("c:\\test");     vector<string> files = vector<string>();      getdir(dir,files);     (unsigned int = 0;i < files.size();i++)       cout << files[i] << endl;     return 0; } 

now can file names. compare file name.

while ((dirp = readdir(dp)) != null) { std::string fname = dirp->d_name; if(fname.find("abc") != std::string::npos)     files.push_back(fname); } 

also can use scandir function can register filter function.

static int filter(const struct dirent* dir_ent) {     if (!strcmp(dir_ent->d_name, ".") || !strcmp(dir_ent->d_name, "..")) return 0;     std::string fname = dir_ent->d_name;      if (fname.find("abc") == std::string::npos) return 0;      return 1; }    int main() {     struct dirent **namelist;      std::vector<std::string> v;     std::vector<std::string>::iterator  it;      n = scandir( dir_path , &namelist, *filter, alphasort );      (int i=0; i<n; i++) {         std::string fname = namelist[i]->d_name;          v.push_back(fname);          free(namelist[i]);     }     free(namelist);  return 0; }