Getting all used fonts in the loaded document Leave feedback

Starting from version 25.3 the GroupDocs.Viewer is able to collect and return all fonts, which are used inside the document, loaded to the Viewer class instance. This includes both metadata about every font and its binary content. GroupDocs.Viewer is able to return both fonts, which are embedded inside the document (stored inside it) and the system fonts, which are stored in the system folder and are used in the document content.

Metadata and binary content about one used font is represented by the new class UsedFontInfo, that is located in the GroupDocs.Viewer.Fonts namespace. This class has the next properties:

• Name of a System.String type — a unique name of the font, never is null or empty string.
• IsEmbedded boolean flag, indicates whether font is embedded (true) or system (false).
• FamilyName of a System.String type — family name of the given font. The value of this property may be empty, depending on the specific font and a format of the loaded document.
• Style of a System.String type — style name of the given font. The value of this property may be empty, depending on the specific font and a format of the loaded document.
• Content of the byte[] type — a byte array, that contains a full content of the given font. In very rare cases may be null or empty, when the given font is a system font and the runtime is not able to get its content. This usually happens on Linux.
• Format enum of FontFormat type — indicates a format of the given font. The following formats are currently supported: TrueType font format (TTF), OpenType font format (OTF), TrueType Collection font format (TTC), Embedded OpenType font format (EOT). If the GroupDocs.Viewer cannot grab the binary content of the system font (Content property is null), this property may return the FontFormat.Unknown value.

In order to obtain the fonts used in the given document, this document should be loaded to the instance of the Viewer class using one of its constructors and then the GetAllFonts() instance method should be invoked. This method returns a list of all used fonts, where each font is represented as an instance of previously described UsedFontInfo class. If a given document does not use any fonts or due to its format it cannot use any fonts (for example, archives or raster images), then the empty list will be returned.

Example below shows loading the sample DOCX document to the Viewer class, and then returning and printing all fonts used within it.

using GroupDocs.Viewer;
// ...

const string filename = "sample.docx";
string inputPath = "\full\path\" + filename;

using (Viewer viewer = new Viewer(inputPath))
{
    IReadOnlyList<Fonts.UsedFontInfo> allFonts = viewer.GetAllFonts();
    Console.WriteLine("{0} fonts found in the '{1}' document", allFonts.Count, filename);
    foreach (Fonts.UsedFontInfo font in allFonts)
    {
        Console.WriteLine("{0} font '{1}' of '{2}' family has {3} bytes and is of '{4}' format",
            font.IsEmbedded ? "Embedded" : "System",
            font.Name,
            font.FamilyName,
            font.Content.Length,
            font.Format);
    }
}

Imports GroupDocs.Viewer
' ...

Const filename As String = "sample.docx"
Dim inputPath As String = "\full\path\" & filename

Using viewer As New Viewer(inputPath)
    Dim allFonts As IReadOnlyList(Of Fonts.UsedFontInfo) = viewer.GetAllFonts()
    Console.WriteLine("{0} fonts found in the '{1}' document", allFonts.Count, filename)
    For Each font As Fonts.UsedFontInfo In allFonts
        Console.WriteLine("{0} font '{1}' of '{2}' family has {3} bytes and is of '{4}' format",
            If(font.IsEmbedded, "Embedded", "System"),
            font.Name,
            font.FamilyName,
            font.Content.Length,
            font.Format)
    Next
End Using

For the given sample DOCX document there is the next output in console:

8 fonts found in the 'sample.docx' document
Embedded font 'Sancreek' of 'Auto' family has 47612 bytes and is of 'TrueTypeFont' format
Embedded font 'Trade Winds' of 'Auto' family has 84588 bytes and is of 'TrueTypeFont' format
System font 'Calibri' of 'Swiss' family has 1648120 bytes and is of 'TrueTypeFont' format
System font 'Cambria' of 'Roman' family has 1792664 bytes and is of 'TrueTypeCollection' format
System font 'Arial' of 'Swiss' family has 1036584 bytes and is of 'TrueTypeFont' format
System font 'Cambria Math' of 'Roman' family has 1792664 bytes and is of 'TrueTypeCollection' format
System font 'Courier New' of 'Modern' family has 806504 bytes and is of 'TrueTypeFont' format
System font 'MS Gothic' of 'Modern' family has 8990160 bytes and is of 'TrueTypeCollection' format