设置默认字体名称

Aspose.PDF for .NET API 允许您在文档中字体不可用时设置默认字体名称。您可以使用 RenderingOptions 类的 DefaultFontName 属性来设置默认字体名称。如果 DefaultFontName 设置为 null，则将使用 Times New Roman 字体。以下代码片段演示了如何在将 PDF 保存为图像时设置默认字体名称：

下一个代码片段也适用于 Aspose.Drawing 库。

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ConvertPdfToImageWithDefaultFont()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_DocumentConversion();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "PdfToImageWithDefaultFont.pdf"))
    {
        // Open the image stream
        using (var imageStream = new FileStream(dataDir + "SetDefaultFontName.png", FileMode.Create))
        {
            // Set the resolution for the image
            var resolution = new Aspose.Pdf.Devices.Resolution(300);

            // Create the PNG device and set rendering options
            var pngDevice = new Aspose.Pdf.Devices.PngDevice(resolution);
            var ro = new Aspose.Pdf.RenderingOptions
            {
                DefaultFontName = "Arial"
            };
            pngDevice.RenderingOptions = ro;

            // Process the first page of the document and save it as an image
            pngDevice.Process(document.Pages[1], imageStream);
        }
    }
}