#include <windows.h>
    typedef void (*FileFound)(const std::string& filename,bool dir);
    DWORD IterFiles(const std::string& path,FileFound cb,bool subdir)
    {
        WIN32_FIND_DATA findFileData;
        std::string filePath = path;
        filePath += "\\*.*";
        HANDLE hFind = FindFirstFile(filePath.c_str(), &findFileData);
        if (hFind != INVALID_HANDLE_VALUE)
        {
            do 
            {
                if (strcmp(findFileData.cFileName, ".") == 0 ||
                    strcmp(findFileData.cFileName, "..") == 0)
                {
                    continue;
                }
                
                std::string subfile(path);
                subfile += "\\";
                subfile += findFileData.cFileName;
                if(cb){
                    cb(subfile,
                        findFileData.dwFileAttributes &
                        FILE_ATTRIBUTE_DIRECTORY);
                }

                if (subdir &&
                    findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
                {
                    DWORD dwStatus = IterFiles(subfile,cb,subdir);
                    if(!dwStatus)
                        return dwStatus;
                }
            } while (FindNextFile(hFind, &findFileData));
            return 0;
        }
        return ::GetLastError();
    }

    void MyFileFound(const std::string& filename,bool dir){
        std::cout << filename << " " << dir << std::endl;
    }

    int main(int argc, char **argv)
    {
        IterFiles("C:/TDDownload",MyFileFound,false);
        printf("hello world\n");
        return 0;
    }