pdf

问题 I used chrome to convert a webpage into Pdf using save as pdf option. Now the problem is that when I extract the data from it using PyPDF2, it shows Null whereas it works on other pdf files easily. I know that I can extract data directly from the website but I want to understand why this is not working. It shows the correct number of pages but when I extracttext(), it shows nothing. Does anyone know what is the problem? The link to the page is https://en.wikipedia.org/wiki/Rapping. I

问题 I have created a signed PDF using iTextSharp in C# .Net. In the signed PDF I want to have a validity symbol so that when a user opens it in Adobe Reader it shows a green tick mark along with its signature. But in my web application (a html page with canvas) I want to remove that question mark from the PDF so that it does not show like in this screen: So I want to keep the original bytes of the PDF in which signatureappearance.Acro6Layers = false; is added in code to get this symbol. But

问题 I'm trying to fetch a PDF file from a URL, and to present it in my Flutter app (for both Android and iOS). I've searched the web and SO for answers on how to present a fetched PDF file in Flutter, but all I could find was how to present a locally pre-added PDF file. I've also searched for packages doing the same, but I couldn't find one that worked. Example : I'm trying to fetch this PDF file for example, and to present it inside a Flutter widget screen in my app. Does anyone know how can I

问题 I am producing Long Term signature. I am trying to add revocation information (Crls, OCSP Responses, Certificate Chain) to the signature as an unsigned attributes but the revocation information is not been embedded in the final signature. Following is the code snippet: Stream outputStream = new MemoryStream(); List<byte[]> ocspCollection = new List<byte[]>(); List<byte[]> crlCollection = new List<byte[]>(); List<byte[]> certsCollection = new List<byte[]>(); Stream readerStream = new

问题 I am producing Long Term signature. I am trying to add revocation information (Crls, OCSP Responses, Certificate Chain) to the signature as an unsigned attributes but the revocation information is not been embedded in the final signature. Following is the code snippet: Stream outputStream = new MemoryStream(); List<byte[]> ocspCollection = new List<byte[]>(); List<byte[]> crlCollection = new List<byte[]>(); List<byte[]> certsCollection = new List<byte[]>(); Stream readerStream = new

问题 So I am using Android Studio and Flutter to build an APP in which there is a PDF and I am using pdf_viewer_plugin: ^1.0.0+2 to preview the PDF inside the APP. When I connect my phone using cable and run the APP I have no issues what so ever to open the screen and view the PDF, but when I click on Build->APK and install the APK from the file created and go to the same screen with the PDF viewer the whole APP crashes. I can see the screen opens and even the loading indicator I have put it is

问题 Using the new jsPDF .html() pretty much pulled straight from their docs, but it still results in a blank page: Results in blank page: function saveDoc() { window.html2canvas = html2canvas const doc = document.getElementById('doc') if (doc) { var pdf = new jsPDF('p', 'pt', 'a4') pdf.html(doc.innerHTML, { callback: function (pdf) { pdf.save('DOC.pdf'); } }) } } Results in no PDF generated: function saveDoc() { window.html2canvas = html2canvas const doc = document.getElementById('doc') if (doc)

问题 I'm trying to render Pdfs pages into png files using Ghostscript v9.02. For that purpose I'm using the following command line: gswin32c.exe -sDEVICE=png16m -o outputFile%d.png mypdf.pdf This is working fine when the pdf crop box is the same as the media box, but if the crop box is smaller than the media box, only the media box is displayed and the border of the pdf page is lost. I know usually pdf viewers only display the crop box but I need to be able to see the whole media page in my png

问题 As we can see from the image my content overlaps with the header image and this is the code I have: <style type="text/css" media="print"> @page { /*size:landscape;*/ @top-center { content: element(header); } @bottom-left { content: element(footer); } } div.header { padding: 10px; position: running(header); } div.footer { display: block; padding: 5px; position: running(footer); } .pagenumber:before { content: counter(page); } .pagecount:before { content: counter(pages); } </style> </head> <div

问题 As we can see from the image my content overlaps with the header image and this is the code I have: <style type="text/css" media="print"> @page { /*size:landscape;*/ @top-center { content: element(header); } @bottom-left { content: element(footer); } } div.header { padding: 10px; position: running(header); } div.footer { display: block; padding: 5px; position: running(footer); } .pagenumber:before { content: counter(page); } .pagecount:before { content: counter(pages); } </style> </head> <div