C++判断指定目录是否存在

bool IsDirExist(string filename)
{
	size_t len = filename.length();
	if(filename[len-1] != '/' && filename[len-1] != '\\')
		filename.append("/");
	filename.append("000.tmp");
	ofstream outf(filename.c_str());
	bool flag = outf;
	if(outf)
	{
		outf.close();
		remove(filename.c_str());
	}
	return flag;
}