生成 Winnovative PDF 为一定的宽度/高度像素大小

Question

我希望使用 Winnovative PDF 转换器从 HTML 生成 PDF 文档

我希望将 PDF 转换为精确的 842 x 595 像素

我已经尝试过：

pdfConverter.PdfDocumentOptions.PdfPageSize = PdfPageSize.A5

但这不合适。所以我尝试过：

    pdfConverter.PdfDocumentOptions.PdfPageSize = PdfPageSize.Custom
    pdfConverter.PdfDocumentOptions.CustomPdfPageSize = New SizeF(842, 595)

但是这也不起作用，因为我认为尺寸是以与像素不同的格式测量的？

如何生成精确为 842 x 595 像素的 PDF，使其与我的 HTML 内容匹配？

Answer 1

将 HTML 内容渲染为 PDF 时涉及两件事。 PDF 页面大小和转换器内部 HTML 查看器宽度。启用 FitWidth 后，可以缩小 HTML 内容以适合 PDF 页面宽度。

PDF 页面大小以磅表示（1 磅为 1/72 英寸），内部 HTML 查看器窗口大小以像素表示（i 像素为 1/96 英寸）。

PDF 页面 A4 肖像尺寸为 595 x 842 点，与 595 点对应的 HTML 查看器宽度为 595 x 96 / 72 = 793 像素。

所以转换器的设置是：

pdfConverter.HtmlViewerWidth = 793
pdfConverter.PdfDocumentOptions.PdfPageSize = new PdfPageSize(595,842)

您可以在 控制 PDF 页面演示中的 HTML 缩放。以下是该演示中相关代码的副本：

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    htmlToPdfConverter.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

    // Html Viewer Options

    // Set HTML Viewer width in pixels which is the equivalent in converter of the browser window width
    // This is a preferred width of the browser but the actual HTML content width can be larger in case the HTML page 
    // cannot be entirely displayed in the given viewer width
    // This property gives the size of the HTML content which can be further scaled to fit the PDF page based on selected options
    // The HTML content size is in pixels and the PDF page size is in points (1 point = 1/72 inches)
    // The converter is using a 96 DPI resolution to transform pixels to points with the following formula: Points = Pixels/96 * 72            
    htmlToPdfConverter.HtmlViewerWidth = int.Parse(htmlViewerWidthTextBox.Text);

    // Set HTML viewer height in pixels to convert the top part of a HTML page 
    // Leave it not set to convert the entire HTML
    if (htmlViewerHeightTextBox.Text.Length > 0)
        htmlToPdfConverter.HtmlViewerHeight = int.Parse(htmlViewerHeightTextBox.Text);

    // Set the HTML content clipping option to force the HTML content width to be exactly HtmlViewerWidth pixels
    // If this option is false then the actual HTML content width can be larger than HtmlViewerWidth pixels in case the HTML page 
    // cannot be entirely displayed in the given viewer width
    // By default this option is false and the HTML content is not clipped
    htmlToPdfConverter.ClipHtmlView = clipContentCheckBox.Checked;

    // PDF Page Options

    // Set PDF page size which can be a predefined size like A4 or a custom size in points 
    // Leave it not set to have a default A4 PDF page
    htmlToPdfConverter.PdfDocumentOptions.PdfPageSize = SelectedPdfPageSize();

    // Set PDF page orientation to Portrait or Landscape
    // Leave it not set to have a default Portrait orientation for PDF page
    htmlToPdfConverter.PdfDocumentOptions.PdfPageOrientation = SelectedPdfPageOrientation();

    // Set PDF page margins in points or leave them not set to have a PDF page without margins
    htmlToPdfConverter.PdfDocumentOptions.LeftMargin = float.Parse(leftMarginTextBox.Text);
    htmlToPdfConverter.PdfDocumentOptions.RightMargin = float.Parse(rightMarginTextBox.Text);
    htmlToPdfConverter.PdfDocumentOptions.TopMargin = float.Parse(topMarginTextBox.Text);
    htmlToPdfConverter.PdfDocumentOptions.BottomMargin = float.Parse(bottomMarginTextBox.Text);

    // HTML Content Destination and Spacing Options

    // Set HTML content destination in PDF page
    if (xLocationTextBox.Text.Length > 0)
        htmlToPdfConverter.PdfDocumentOptions.X = float.Parse(xLocationTextBox.Text);
    if (yLocationTextBox.Text.Length > 0)
        htmlToPdfConverter.PdfDocumentOptions.Y = float.Parse(yLocationTextBox.Text);
    if (contentWidthTextBox.Text.Length > 0)
        htmlToPdfConverter.PdfDocumentOptions.Width = float.Parse(contentWidthTextBox.Text);
    if (contentHeightTextBox.Text.Length > 0)
        htmlToPdfConverter.PdfDocumentOptions.Height = float.Parse(contentHeightTextBox.Text);

    // Set HTML content top and bottom spacing or leave them not set to have no spacing for the HTML content
    htmlToPdfConverter.PdfDocumentOptions.TopSpacing = float.Parse(topSpacingTextBox.Text);
    htmlToPdfConverter.PdfDocumentOptions.BottomSpacing = float.Parse(bottomSpacingTextBox.Text);

    // Scaling Options

    // Use this option to fit the HTML content width in PDF page width
    // By default this property is true and the HTML content can be resized to fit the PDF page width
    htmlToPdfConverter.PdfDocumentOptions.FitWidth = fitWidthCheckBox.Checked;

    // Use this option to enable the HTML content stretching when its width is smaller than PDF page width
    // This property has effect only when FitWidth option is true
    // By default this property is false and the HTML content is not stretched
    htmlToPdfConverter.PdfDocumentOptions.StretchToFit = stretchCheckBox.Checked;

    // Use this option to automatically dimension the PDF page to display the HTML content unscaled
    // This property has effect only when the FitWidth property is false
    // By default this property is true and the PDF page is automatically dimensioned when FitWidth is false
    htmlToPdfConverter.PdfDocumentOptions.AutoSizePdfPage = autoSizeCheckBox.Checked;

    // Use this option to fit the HTML content height in PDF page height
    // If both FitWidth and FitHeight are true then the HTML content will resized if necessary to fit both width and height 
    // preserving the aspect ratio at the same time
    // By default this property is false and the HTML content is not resized to fit the PDF page height
    htmlToPdfConverter.PdfDocumentOptions.FitHeight = fitHeightCheckBox.Checked;

    // Use this option to render the whole HTML content into a single PDF page
    // The PDF page size is limited to 14400 points
    // By default this property is false
    htmlToPdfConverter.PdfDocumentOptions.SinglePage = singlePageCheckBox.Checked;

    string url = urlTextBox.Text;

    // Convert the HTML page to a PDF document using the scaling options
    byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);

    // Send the PDF as response to browser

    // Set response content type
    Response.AddHeader("Content-Type", "application/pdf");

    // Instruct the browser to open the PDF file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename=HTML_Content_Scaling.pdf; size={0}", outPdfBuffer.Length.ToString()));

    // Write the PDF document buffer to HTTP response
    Response.BinaryWrite(outPdfBuffer);

    // End the HTTP response and stop the current page processing
    Response.End();
}

Answer 2

如果您将 PdfConverter.PageWidth 和 PdfConverter.PageHeight 属性设置为 842 和 595，那么这应该会导致您的 Web 内容填充整个 PDF 页面区域。

还有一个 FitWidth 属性，如果您希望 Web 内容不缩小以适应可用页面区域，则可以将其设置为 False。这意味着如果您的内容太大，将会溢出页面。

关于 Winnovative PDF 需要提出的另一点是，处理高分辨率图像并不容易，因此根据您的 PDF 需求（和输入），您可能很难获得高质量的图像 - 也许这只是我的经验。

说到图像，Winnovative PDF 似乎会获取您输入的 html 并创建所有图像的单个图像，然后以屏幕​​分辨率 (72 dpi) 添加到 PDF，这甚至会使简单的文本看起来质量较低。

如果您想尝试自己处理 html 布局，您始终可以使用其他产品（例如 ）将内容直接转换为 PDF ITextSharp 可以为更高分辨率的图像提供更大的灵活性。不过我真的取决于你的总体需求