const int BUFSIZE = 1024;
char buffer[BUFSIZE] = { 0 };
OPENFILENAME ofns = { 0 };
ofns.lStructSize = sizeof(ofns);
ofns.lpstrFile = buffer;
ofns.nMaxFile = BUFSIZE;
ofns.lpstrTitle = "Select Directory";
GetOpenFileName(&ofns);
std::string directory = buffer;