问题描述
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我正在尝试创建一种将PDF文件直接发送到我的打印机的方法（导致出现打印对话框）。
以下是我一直在努力的代码-大多数代码都在这里的论坛中找到。如果我使用iTextSharp创建新的PDF文档，效果很好，但是当我尝试向现有文件中注入一些JavaScript时，调用
print()
<script type=\"text/javascript\">
function load() {
try {
var x = document.getElementById(\"frame1\");
x.print();
}
catch (err) {
}
}
</script>
<body onload=\"load();\">
<form id=\"form1\" runat=\"server\">
<div>
<iframe id=\"frame1\" src=\"C:/1686850_1.pdf\" runat=\"server\" frameborder=\"0\" style=\"height: 0px; width: 0px;\" />
</div>
</form>
</body>
</html>
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
public partial class Print : System.Web.UI.Page
{
protected void Page_Load(object sender,EventArgs e)
{
SetPDF(File.ReadAllBytes(\"C:\\\\1686850.pdf\"),\"C:\\\\1686850_1.pdf\"); //test files
}
private void SetPDF(byte[] file,string outputPath)
{
PdfReader reader = new PdfReader(file);
int pageCount = reader.NumberOfPages;
Rectangle pageSize = reader.GetPageSize(1);
Document pdf = new Document(pageSize);
PdfWriter writer = PdfWriter.GetInstance(pdf,new FileStream(outputPath,FileMode.Create));
pdf.open();
//This action leads directly to printer dialogue
PdfAction jAction = PdfAction.JavaScript(\"this.print(true);\\r\",writer);
writer.AddJavaScript(jAction);
//Omitting this loop and simply adding some text to the file produces the behavior I want.
for (int i = 0; i < pageCount; i++)
{
pdf.NewPage();
PdfImportedPage page = writer.GetImportedPage(reader,i + 1);
writer.DirectContent.AddTemplate(page,0);
}
pdf.Close();
//Open the pdf in the frame
frame1.Attributes[\"src\"] = outputPath;
}
}
解决方法
我在这里找到了一种方法：http://wskidmore.com/2011/03/pdf-initial-view-settings-itextsharp/
基于此，我编写了以下代码：
private void PrintMenu()
{
...
var notUriPath = Server.MapPath(\"~/\" + filePathName);
var doc = new Document();
var reader = new PdfReader(notUriPath);
using (var memoryStream = new MemoryStream())
{
var writer = PdfWriter.GetInstance(doc,memoryStream);
doc.Open();
// this action leads directly to printer dialogue
var jAction = PdfAction.JavaScript(\"this.print(true);\\r\",writer);
writer.AddJavaScript(jAction);
var cb = writer.DirectContent;
doc.AddDocListener(writer);
for (var p = 1; p <= reader.NumberOfPages; p++)
{
doc.SetPageSize(reader.GetPageSize(p));
doc.NewPage();
var page = writer.GetImportedPage(reader,p);
var rot = reader.GetPageRotation(p);
if (rot == 90 || rot == 270)
cb.AddTemplate(page,-1.0F,1.0F,reader.GetPageSizeWithRotation(p).Height);
else
cb.AddTemplate(page,0);
}
reader.Close();
doc.Close();
File.WriteAllBytes(notUriPath,memoryStream.ToArray());
}
theIframeForPrint.Attributes.Add(\"src\",fullFilePath);
}