How to access the thumbnails of analysis files in Spotfire Server library using Spotfire® C# API

Introduction

The thumbnail is encoded as a Base64 128x96 png inside a LibraryItem. By using the LibraryManager you can fetch the Base64 image. The following is a sample C# code which illustrates how to access the thumbnails of dxps from Spotfire Server library:

Code Sample

// Copyright © 2017. TIBCO Software Inc. Licensed under TIBCO BSD-style license.

private void SaveThumbnailImageFromLibrary(AnalysisApplication app)
{
    LibraryItemCollection items;
    LibraryManager lm = app.GetService();

	items = lm.Search("type:dxp", LibraryItemRetrievalOption.IncludeProperties);

    bool isValidProperty = false;
    foreach (LibraryItem item in items)
    {
        if (item == null) continue;
        LibraryItemPropertyCollection lic = item.Properties;
        LibraryItemProperty prop;
        isValidProperty = lic.TryGetProperty("Spotfire.Preview.Thumb", out prop);
        if (!isValidProperty)
        {
            continue;
        }

        IEnumerator base64 = prop[0].GetEnumerator();//This will give you an image (base64 encoded 128x96 png) as a char enumeration.

        //To save the image:
        /*Image img;
        byte[] fileBytes = Convert.FromBase64String(prop[0].ToString());
        using (MemoryStream ms = new MemoryStream())
        {
            ms.Write(fileBytes, 0, fileBytes.Length);
            img = Image.FromStream(ms);
        }
        img.Save(@"C:ThumbNail.png", ImageFormat.Png); 
        */
    }
}

References

• API Reference: Spotfire Analyst
• API Reference: LibraryManager Class
• API Reference: LibraryItemPropertyCollection. TryGetProperty Method

License:  TIBCO BSD-Style License