Get the format family and the additional information Leave feedback

A format family is a group of several file types for which an application provides additional information. For example, archive files (.7z, .rar, .zip, etc.) or Outlook files (.ost, .pst) are format families.

You can get the format family and the additional information using the GetViewInfo method that returns a ViewInfo object.

GroupDocs.Viewer provides additional information for the following format families:

• Archive files - a collection of folders in the archive (see Obtain information about folders in an archive file);
• CAD drawings - a collection of layouts and layers (see Obtain information about existing layouts and layers);
• Outlook data files - a collection of folders (see Obtain information about folders in an Outlook data file);
• PDF documents - a flag that indicates whether document printing is allowed (see Obtain information about a PDF file);
• Microsoft Project files - the project’s start and end dates (see Obtain information about a Project file).

The following code snippet shows how to get the file type and the pages count from a file:

using (Viewer viewer = new Viewer("sample.pdf"))
{
    // Get file information.
    ViewInfoOptions viewInfoOptions = ViewInfoOptions.ForHtmlView();
    ViewInfo viewInfo = viewer.GetViewInfo(viewInfoOptions);
    // Display file type and pages count.
    Console.WriteLine("Document type is: " + viewInfo.FileType);
    Console.WriteLine("Pages count: " + viewInfo.Pages.Count);
}

The following image shows a sample console output:

The following code snippet shows how to get the file type and the pages count from a stream:

using (Viewer viewer = new Viewer(File.OpenRead("sample.pdf")))
{
    ViewInfoOptions viewInfoOptions = ViewInfoOptions.ForHtmlView();
    ViewInfo viewInfo = viewer.GetViewInfo(viewInfoOptions);
 
    Console.WriteLine("Document type is: " + viewInfo.FileType);
    Console.WriteLine("Pages count: " + viewInfo.Pages.Count);
}

The following image shows a sample console output: