unity 图片转byte数组

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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;
    }