unity 图片转byte数组

public static byte[] ReadTexture(string path)    {        Debug.Log(" @ ! the texture path is + !!    " + path);        FileStream fileStream = new FileStream(path, FileMode.Open, System.IO.FileAccess.Read);        fileStream.Seek(0, SeekOrigin.Begin);        byte[] buffer = new byte[fileStream.Length]; //创建文件长度的buffer           fileStream.Read(buffer, 0, (int)fileStream.Length);        fileStream.Close();        fileStream.Dispose();        fileStream = null;        return buffer;    }