GroupDocs.Viewer for .NET 18.10 Release Notes

This page contains release notes for GroupDocs.Viewer for .NET 18.10.

Major Features

There are 12 features, improvements, and fixes in this regular monthly release. The most notable are:

Added new option which allows setting the list of fonts to exclude when rendering into HTML
Improved rendering of MS Project documents when Start/End date options are set
Improved performance of methods which accept URL

Full List of Issues Covering all Changes in this Release

Key	Summary	Category
VIEWERNET-1677	Option for setting the list of fonts that should be excluded from HTML	Feature
VIEWERNET-1773	Do not show items beyond Start and End date options when rendering MS Project documents	Improvement
VIEWERNET-1742	Release internal resources for methods which accept URL	Improvement
VIEWERNET-1738	GetDocumentInfo method page number depending on the type of ViewerHandler	Improvement
VIEWERNET-1679	Prevent setting malicious values for HtmlResourcePrefix	Improvement
VIEWERNET-1678	Improve setting PageSize and TimeScale for MS Project documents by default	Improvement
VIEWERNET-1741	Specified watermark font not found exception when calling GetPdfFile method	Bug
VIEWERNET-1736	OutlookOptions.MaxItemsInFolder option not working properly for rendering into image and PDF	Bug
VIEWERNET-1662	Incorrect rendering of PDF document into HTML	Bug
VIEWERNET-1659	Duplicate link tag when rendering Text documents with external resources	Bug
VIEWERNET-1649	Exception when rendering PDF document as HTML	Bug
VIEWERNET-1420	Images are missing when rendering PDF document into HTML or Image	Bug

Public API and Backward Incompatible Changes

This section lists public API changes that were introduced in GroupDocs.Viewer for .NET 18.10. It includes not only new and obsoleted public methods, but also a description of any changes in the behavior behind the scenes in GroupDocs.Viewer which may affect existing code. Any behavior introduced that could be seen as a regression and modifies existing behavior is especially important and is documented here.

Option for setting the list of fonts that should be excluded from HTML

Adding fonts into HTML ensures that the text from the original document will appear similar in HTML, regardless of whether fonts are installed on the viewer’s device or not. But at the same time, this improvement comes with the cost of the increased size of the output file. Since the version 18.10 GroupDocs.Viewer API provides a new setting - HtmlOptions.ExcludeFontsList, that allows finding the compromise, by preventing adding specific fonts (that are commonly available on most of the devices). The example below shows how to prevent adding fonts into output HTML. Currently, it works only for Presentation documents. We are planning to extend support for this feature for all document types where it is applicable in the upcoming releases.

Prevent adding Arial and Times New Roman fonts into HTML representations (other fonts used in original presentation will be added).

// Setup GroupDocs.Viewer config
ViewerConfig config = new ViewerConfig();
config.StoragePath = @"C:\storage";
 
// Create html handler
ViewerHtmlHandler htmlHandler = new ViewerHtmlHandler(config);
string guid = "presentation.pptx";
 
HtmlOptions options = new HtmlOptions();
options.ExcludeFontsList.Add("Times New Roman");
options.ExcludeFontsList.Add("Arial");
List<PageHtml> pages = htmlHandler.GetPages(guid, options);
 
 
foreach (PageHtml page in pages)
{
    Console.WriteLine("Page number: {0}", page.PageNumber);
    Console.WriteLine("Html content: {0}", page.HtmlContent);
}

List of Changes in v18.10

In the version 18.10, following public class members were added, marked as obsolete, removed or replaced.

GroupDocs.Viewer.Handler.Input.IInputDataHandler

DateTime GetLastModificationDate(string guid) method compilation is set to fail

This method is obsolete and will be removed after v18.10. GroupDocs.Viewer will rely on LastModificationDate field in the FileDescription object returned by GetFileDescription method.