使用dirent.h，但文件被跳过

Question

I have several hundred images in a folder named: 1.jpg , 3.jpg , 4.jpg , 6.jpg , 8.jpg , 10.jpg , 15. jpg , .... 100.jpg , 102.jpg , 103.jpg , 113.jpg etc...

I am using dirent.h to iterate through the files, but somehow dirent.h starts at 10.jpg and the next file it delivers is suddenly 100.jpg and then 102.jpg , ... why does it skip some images?

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

cv::Mat image;

DIR *dir;
struct dirent *ent;
if ((dir = opendir ("C:\\Users\\Faraz\\Desktop\\Project\\detecting_false_positives_stuff\\face_images\\faces\\")) != NULL) {
    ent = readdir (dir);
    printf ("%s\n", ent->d_name);
    ent = readdir (dir);
    printf ("%s\n", ent->d_name);
    while ((ent = readdir (dir)) != NULL) {
        printf ("%s\n", ent->d_name);

        std::string fullPath = std::string("C:\\Users\\Faraz\\Desktop\\Project\\detecting_false_positives_stuff\\face_images\\faces\\") + ent->d_name;

        cout<<fullPath;

        image = cv::imread(fullPath);

        ...

    }
    closedir (dir);
}
return 1;

}

Answer 1

You'll have to sort the files yourself if you want them in order, readdir won't do that for you. See this also: Does readdir() guarantee an order?