PDFsharp & MigraDoc Foundation http://forum.pdfsharp.com/ |
|
Saving One PdfPage to Two PdfDocuments via MemoryStream http://forum.pdfsharp.com/viewtopic.php?f=8&t=4065 |
Page 1 of 1 |
Author: | pdfuser1 [ Mon Nov 25, 2019 9:46 pm ] |
Post subject: | Saving One PdfPage to Two PdfDocuments via MemoryStream |
In my project, I needed a way to
My first attempt at solving the problem worked, but I went the inefficient route of
I wanted to avoid having to re-read the individual files from the file system. Naturally, you'd expect to be able to do (in pseudocode): Code: // 1. Create PdfDocuments pdfDoc1 and pdfDoc2 // 2. Create a PdfPage pdfPage1 // 3. Add pdfPage1 to pdfDoc1 // 4. Add pdfPage1 to pdfDoc2 or Code: // 1. Create PdfDocuments pdfDoc1 and pdfDoc2 // 2. Create a PdfPage pdfPage1 // 2a. Copy pdfPage1 to a new PdfPage pdfPage2 // 3. Add pdfPage1 to pdfDoc1 // 4. Add pdfPage2 to pdfDoc2 Unfortunately, the first approach won't work because a PdfPage can only be added to a single document. The second approach doesn't work because PdfPage.Copy() doesn't seem to work correctly in PDFsharp. But you can still add a PdfPage to two different PdfDocuments by using MemoryStream. The revised approach will be as follows: Code: // 1. Create PdfDocuments pdfDoc1 and pdfDoc2 // 2. Create a PdfPage pdfPage1 // 3. Add pdfPage1 to pdfDoc1 // 4. Save the pdfDoc1 (with its one page) to MemoryStream ms1 // 5. Open ms1 as a PdfDocument and create a PdfPage pdfPage2 from it // 6. Add pdfPage2 to pdfDoc2 The actual code is actually straight forward. Here is the gist: Code: '''''''''''''''''''''''''' ' VB.NET '''''''''''''''''''''''''' Dim pdfDoc1 As New PdfDocument Dim pdfDoc2 As New PdfDocument Dim pdfPage1 As New PdfPage ' Design / add info to your page pdfDoc1.AddPage(pdfPage1) Using ms1 As New MemoryStream pdfDoc1.Save(ms1) pdfDoc2.AddPage(PdfReader.Open(ms1, PdfDocumentOpenMode.Import).Pages(0)) End Using ' Now both pdfDoc1 and pdfDoc2 have the contents of pdfPage1 ' You can save each file to the file system when ready pdfDoc1.Save("file1.pdf") pdfDoc2.Save("file2.pdf") Code: ////////////////////////
// C# (Untested) //////////////////////// PdfDocument pdfDoc1 = new PdfDocument(); PdfDocument pdfDoc2 = new PdfDocument(); PdfPage pdfPage1 = new PdfPage(); // Design / add info to your page pdfDoc1.AddPage(pdfPage1); using (MemoryStream ms1 = new MemoryStream()) { pdfDoc1.Save(ms1); pdfDoc2.AddPage(PdfReader.Open(ms1, PdfDocumentOpenMode.Import).Pages[0]); } // Now both pdfDoc1 and pdfDoc2 have the contents of pdfPage1 // You can save each file to the file system when ready pdfDoc1.Save("file1.pdf"); pdfDoc2.Save("file2.pdf"); |
Author: | rsoeung [ Fri Jan 22, 2021 5:42 pm ] |
Post subject: | Re: Saving One PdfPage to Two PdfDocuments via MemoryStream |
Once a page is created and added to a PdfDocument, the page's Owner property is set to that document and there's no way of overwriting the Owner. So you'd have to just get the contents of the page. Code: string doc1 = @"C:\doc1.pdf"; string doc2 = @"C:\doc2.pdf"; // variable to hold page contents CSequence contents; // create 1st document and page var d1 = new PdfDocument(doc1); var page = d1.AddPage(); // you'd have to create a method to add contents to page // refer to http://www.pdfsharp.net/wiki/HelloWorld-sample.ashx for example AddContentToPage(page); // close document for content to write to page d1.Close(); // reopen 1st document to get page contents var doc = PdfReader.Open(doc1, PdfDocumentOpenMode.Modify); // grab page's contents contents = ContentReader.ReadContent(doc.Pages[0]); doc.Close(); // repeat the below 3 lines to add same content to different pdf documents var d2 = new PdfDocument(doc2); d2.AddPage().Contents.ReplaceContent(contents); d2.Close(); Best, Reas |
Author: | pdfuser1 [ Sat Jan 23, 2021 2:22 am ] |
Post subject: | Re: Saving One PdfPage to Two PdfDocuments via MemoryStream |
rsoeung wrote: Once a page is created and added to a PdfDocument, the page's Owner property is set to that document and there's no way of overwriting the Owner. So you'd have to just get the contents of the page. Thank you for commenting, but I am not sure how it relates to my original post. Did you mean to reply to some other topic instead? |
Author: | rsoeung [ Mon Feb 01, 2021 10:42 pm ] |
Post subject: | Re: Saving One PdfPage to Two PdfDocuments via MemoryStream |
pdfuser1 wrote: Thank you for commenting, but I am not sure how it relates to my original post. Did you mean to reply to some other topic instead? In your example code you are trying to reuse the same PdfPage for two different documents. That's not possible because once a PdfPage is added to the first document, it's owner property is set to that document. Therefore, to make copies of this page you'd have to extract it's contents and insert it into the 2nd document's PdfPage. |
Author: | pdfuser1 [ Tue Feb 02, 2021 3:22 am ] |
Post subject: | Re: Saving One PdfPage to Two PdfDocuments via MemoryStream |
rsoeung wrote: In your example code you are trying to reuse the same PdfPage for two different documents. ... Therefore, to make copies of this page you'd have to extract it's contents and insert it into the 2nd document's PdfPage. You may have missed where I said "I wanted to avoid having to re-read the individual files from the file system". Unless I am misreading your code, I believe you are doing just that while my solution avoids it. P.S. Just to give you a bit more context, see the details of my use case here. The MemoryStream solution saved 25% off the total run time. |
Page 1 of 1 | All times are UTC |
Powered by phpBB® Forum Software © phpBB Group https://www.phpbb.com/ |