Linux中C/C++对目录的读取

#include <iostream>
#include <dirent.h>
using namespace std;
int main() {
string dirName;
cin >> dirName;
DIR *dirPointer;//point the directory file
struct dirent *filePointer;//point a file of the directory
dirPointer = opendir(dirName.c_str());
if (!dirPointer) {
cout << "Error opening!" << endl;
}
else {
while (filePointer = readdir(dirPointer)) {
cout << string(filePointer->d_name) << endl;
}
closedir(dirPointer);
}
return 0;
}