# Použití miniaturních obrazových dat

Existuje možnost zapsat obrazová data pro exportovanou entitu Vault do DI - EcENTITY.thumbnail. Chcete-li obrázek uložit na disk, nahrajte hodnotu sql jako pole bajtů a tato data zapište jako soubor jpg.

Chcete-li získat objekt .NET FRAMEWORK System.Drawing.Image, můžete použít tuto ukázku:

<pre class="language-sql"><code class="lang-sql">/// &#x3C;summary>
/// http://justonesandzeros.typepad.com/blog/2011/05/viewing-thumbnails.html
/// &#x3C;/summary>
/// &#x3C;param name="propVal">the value of the property Thumbnail&#x3C;/param>
/// &#x3C;param name="width">image width&#x3C;/param>
/// &#x3C;param name="height">image height&#x3C;/param>
/// &#x3C;returns>&#x3C;/returns>
public static System.Drawing.Image GetThumbnail(object propVal, int width, int height)
{
<strong>    if (propVal == null || false == (propVal is byte[]))
</strong>        return null;
    byte[] thumbnailRaw = (byte[])propVal;
    System.Drawing.Image retVal = null;
    using (System.IO.MemoryStream ms = new System.IO.MemoryStream(thumbnailRaw))
    {
        try
        {
<strong>            ms.Seek(12, System.IO.SeekOrigin.Begin);
</strong>            System.Drawing.Imaging.Metafile metafile =
                    new System.Drawing.Imaging.Metafile(ms);
<strong>            retVal = metafile.GetThumbnailImage(width, height,
</strong>                    new System.Drawing.Image.GetThumbnailImageAbort(GetThumbnailImageAbort),
                    System.IntPtr.Zero);
        }
<strong>        catch
</strong>        {
            retVal = null;
<strong>        }
</strong><strong>        
</strong>        if (retVal == null)
        {
            try
            {
                ms.Seek(0, System.IO.SeekOrigin.Begin);
                System.Drawing.Image rawImage = System.Drawing.Image.FromStream(ms, true);
                retVal = rawImage.GetThumbnailImage(width, height,
<strong>                    new System.Drawing.Image.GetThumbnailImageAbort(GetThumbnailImageAbort),
</strong>                    System.IntPtr.Zero);
            }
            catch
<strong>            {
</strong>                retVal = null;
<strong>            }
</strong>        }
    }
    return retVal;
}
</code></pre>


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