list directory files recursively with boost::filesystem

Question

I'm using new boost, v1.5.3, to carry out this task like following, thanks to the class recursive_directory_iterator (I don't have to write recursive code):

void ListDirRec(const char *Dir, vector<string>& DirFileList, const char* ext)
{    
recursive_directory_iterator rdi(Dir);  
recursive_directory_iterator end_rdi;

DirFileList.empty();

string ext_str0(ext);   
for (; rdi != end_rdi; rdi++)
{
    rdi++;
    //cout << (*di).path().string() << endl;
    cout << (*rdi).path().string() << endl;

    //cout << " <----- " << (*rdi).path().extension() << endl;

    //string ext_str1 = (*rdi).path().extension().string();
    if (ext_str0.compare((*rdi).path().extension().string()) == 0)
    {
        DirFileList.push_back((*rdi).path().string());
    }
}

the function list files with specific extension. This function works for cases but frequently return an "assertion fails error" like:

**** Internal program error - .... assertion (m_imp.get()) ... operations.hpp(952): dereference of end recursive_directory_iterator

I barely figure out the cause of this error. Can any try.. catch help? thanks in advance for any help

Answer 1

You are incrementing rdi inside the loop as well as in the for declaration:

for (; rdi != end_rdi; rdi++)
{
    rdi++;

That means that rdi might be end_rdi (the end-iterator, which means past the last element) within your loop. Is there any reason you're doing this? (If this is intentional, you should check to make sure rdi != end_rdi again after you increment it.)

Answer 2

You could try something like this:

recursive_directory_iterator dir(path(Dir));
for(auto&& i : dir) {
    if (is_directory(i)) {
        //Do whatever you want
        cout << i << endl;
    }
}