Question

我想在pdf文件中嵌入一个javascript片段，以便在从浏览器窗口打开时立即打印。为了尝试实现这一目标，我正在关注此示例here.

我创建了一个辅助类，它有一个静态方法来处理这个任务。我已经准备好将pdf文件路径字符串传递给方法了。我不明白的是它的输出流部分是如何工作的。我希望将更新后的pdf保存到我的服务器硬盘中。我不想将它流回我的浏览器。任何指导将不胜感激。

public class PdfHelper
{
    public static void AddPrintFunction(string pdfPath, Stream outputStream)
    {
        PdfReader reader = new PdfReader(pdfPath);
        int pageCount = reader.NumberOfPages;
        Rectangle pageSize = reader.GetPageSize(1);

        // Set up Writer 
        PdfDocument document = new PdfDocument();

        PdfWriter writer = PdfWriter.GetInstance(document, outputStream);

        document.Open();

        //Copy each page 
        PdfContentByte content = writer.DirectContent;

        for (int i = 0; i < pageCount; i++)
        {
            document.NewPage();
            // page numbers are one based 
            PdfImportedPage page = writer.GetImportedPage(reader, i + 1);
            // x and y correspond to position on the page 
            content.AddTemplate(page, 0, 0);
        }

        // Inert Javascript to print the document after a fraction of a second to allow time to become visible.
        string jsText = "var res = app.setTimeOut(‘var pp = this.getPrintParams();pp.interactive = pp.constants.interactionLevel.full;this.print(pp);’, 200);";

        //string jsTextNoWait = “var pp = this.getPrintParams();pp.interactive = pp.constants.interactionLevel.full;this.print(pp);”;
        PdfAction js = PdfAction.JavaScript(jsText, writer);
        writer.AddJavaScript(js);

        document.Close();

    }
}

Answer 1

有关如何完成此任务，请查看this和this SO帖子。

基本上你应该有这样的东西：

var pdfLocalFilePath = Server.MapPath("~/sourceFile.pdf");
var outputLocalFilePath = Server.MapPath("~/outputFile.pdf");
using (var outputStream = new FileStream(outputLocalFilePath, FileMode.CreateNew))
{
    AddPrintFunction(pdfLocalFilePath, outputStream);
    outputStream.Flush();
}

使用iTextSharp将javascript添加到pdf文件

1 个答案: