无法使用 Aspose.Pdf 打印 jpg答案

【问题标题】：Can't print jpg with Aspose.Pdf无法使用 Aspose.Pdf 打印 jpg
【发布时间】：2021-06-08 13:26:17
【问题描述】：

我想加载一个 JPEG 文件并在 C# (.net Framework 4.8) 中使用 Aspose.Pdf 打印它。我目前拥有的代码是：

public void PrintImage(string fileToPrint, string printerName, string jobName)
    {
      System.Drawing.Image srcImage = System.Drawing.Image.FromFile(fileToPrint);
      int h = srcImage.Height;
      int w = srcImage.Width;

      var doc = new Document();
      var page = doc.Pages.Add();
      var image = new Image();
      image.File = (fileToPrint);

      page.PageInfo.Height = (h);
      page.PageInfo.Width = (w);
      page.PageInfo.Margin.Bottom = (0);
      page.PageInfo.Margin.Top = (0);
      page.PageInfo.Margin.Right = (0);
      page.PageInfo.Margin.Left = (0);

      page.Paragraphs.Add(image);

      var viewer = new PdfViewer(doc);
      PrintUsingViewer(viewer, printerName, jobName);
    }

    private static void PrintUsingViewer(PdfViewer viewer, string printerName, string jobName)
    {
      viewer.AutoResize = true;         // Print the file with adjusted size
      viewer.AutoRotate = true;         // Print the file with adjusted rotation
      viewer.PrintPageDialog = false;   // Do not produce the page number dialog when printing

      var ps = new System.Drawing.Printing.PrinterSettings();
      var pgs = new System.Drawing.Printing.PageSettings();

      ps.PrinterName = printerName;
      viewer.PrinterJobName = jobName;

      viewer.PrintDocumentWithSettings(pgs, ps);
      viewer.Close();
    }

当我保存文档而不是打印并查看它时，它看起来很好（添加了图像）。但是，当尝试打印图像时，它没有打印出来，页面只是空白..

我想在不先将文档另存为 PDF 的情况下进行打印，然后再尝试打印已保存的 PDF。有人看到我做错了吗？

【问题讨论】：

在 page.Paragraphs.Add(image);行，请尝试添加 doc.ProcessParagraphs();然后打印文件。如果问题仍然存在，请在我们的官方支持论坛 (forum.aspose.com/c/pdf/10) 中发帖告知我们，因为这是讨论此类问题的正确场所，以便妥善解决和解决问题。我是 Asad Ali，我是 Aspose 的开发人员布道师。
这解决了问题！非常感谢！

标签： c# pdf printing jpeg aspose.pdf

【解决方案1】：

解决方案是添加这行代码

doc.ProcessParagraphs();

就在这一行之后：

page.Paragraphs.Add(image);

所以现在的代码变成了

public void PrintImage(string fileToPrint, string printerName, string jobName)
    {
      System.Drawing.Image srcImage = System.Drawing.Image.FromFile(fileToPrint);
      int h = srcImage.Height;
      int w = srcImage.Width;

      var doc = new Document();
      var page = doc.Pages.Add();
      var image = new Image();
      image.File = (fileToPrint);

      page.PageInfo.Height = (h);
      page.PageInfo.Width = (w);
      page.PageInfo.Margin.Bottom = (0);
      page.PageInfo.Margin.Top = (0);
      page.PageInfo.Margin.Right = (0);
      page.PageInfo.Margin.Left = (0);

      page.Paragraphs.Add(image);
      doc.ProcessParagraphs();

      var viewer = new PdfViewer(doc);
      PrintUsingViewer(viewer, printerName, jobName);
    }

    private static void PrintUsingViewer(PdfViewer viewer, string printerName, string jobName)
    {
      viewer.AutoResize = true;         // Print the file with adjusted size
      viewer.AutoRotate = true;         // Print the file with adjusted rotation
      viewer.PrintPageDialog = false;   // Do not produce the page number dialog when printing

      var ps = new System.Drawing.Printing.PrinterSettings();
      var pgs = new System.Drawing.Printing.PageSettings();

      ps.PrinterName = printerName;
      viewer.PrinterJobName = jobName;

      viewer.PrintDocumentWithSettings(pgs, ps);
      viewer.Close();
    }

现在图像打印正确！

【讨论】：