int WINAPI wWinMain(HINSTANCE instance, HINSTANCE prev_instance, LPWSTR cmd_line, int show_cmd){
con_valid = AttachConsole(ATTACH_PARENT_PROCESS);
if (con_valid) {
err = freopen_s(&res_fp, "CON", "w", stdout);
err = freopen_s(&res_fp, "CON", "w", stderr);
} else {
err = freopen_s(&res_fp, "NUL", "w", stdout);
err = freopen_s(&res_fp, "NUL", "w", stderr);
}