I want to generate a PDF Document in Blazor WASM. I found examples with iTexSharp, so I did a small example.
Now I have two problems:
I have trouble with the image path to add an image in the pdf:
`Image img = Image.GetInstance("images/test.png");
How need I set the image reference to my "wwwroot/images" folder?
I get some error when I want to close my document with the command "document.Close()"
The error is:
System.Security.Cryptography.Algorithms is not supported on this
platform.
System.PlatformNotSupportedException: System.Security.Cryptography.Algorithms is not supported on this platform.
at System.Security.Cryptography.MD5.Create()
at iTextSharp.text.pdf.PdfEncryption.CreateDocumentId()
at iTextSharp.text.pdf.PdfWriter.Close()
at iTextSharp.text.pdf.PdfDocument.Close()
at iTextSharp.text.Document.Close()
Here is the whole code:
_document = new Document(PageSize.A4, 10f, 10f, 20f, 30f);
_pdfPTable.WidthPercentage = 50;
_pdfPTable.HorizontalAlignment = Element.ALIGN_LEFT;
_fontStyle = FontFactory.GetFont("Tahoma", 8f, 1);
PdfWriter.GetInstance(_document, _memoryStream);
_document.Open();
float[] sizes = new float[_maxColumn];
for (int i = 0; i < _maxColumn; i++)
{
if (i == 0) sizes[i] = 50;
else sizes[i] = 100;
}
_pdfPTable.SetWidths(sizes);
this.ReportHeader();
this.ReporBody();
_pdfPTable.HeaderRows = 2;
_document.Add(_pdfPTable);
_document.Close();
return _memoryStream.ToArray();
I have the same problem as you. What I found out is that because of WebAssembly sandbox constraint it will not be able to run itextsharp on the client side. That is why you are getting an error at the .close()
Read more at:
https://learn.microsoft.com/en-us/dotnet/core/compatibility/cryptography/5.0/cryptography-apis-not-supported-on-blazor-webassembly
As for the problem with the image, if you have at the server side it will be able to be used. Otherwise you would need to make it an embedded resource and them stream it in.
Related
Good Evening (UK)
I'm trying to filter down a 1500+ page PDF file to only the pages which include a certain text string (typically one or two words). My laptop is locked down with respect to installing more software BUT I have used action(script)s quite a bit
I get the error below when I try to install this action into Abobe Acrobat X Pro (Win 7):
screen dump of error
called "Extract Commented Pages"... supposed to be OK for X and XI this looks like what I want.....
I wondered if there was something simple causing the problem but the actionscript file is rather... busy to say the least.
I used to have an action that I think was based on a legal redaction script but it is filed somewhere!
If you have already got an action that does this or a version of the above that doesn't give the error I get (unable to import the Action.... The file is either invalid or corrupt) I will forever by indebted to your gratitude
Many thanks, have a good weekend!
I recently came across a script found at the following link: http://forums.adobe.com/thread/1077118
I'm having some issues getting the script to run in Acrobat, despite everything looking alright in the script itself. I'll update if I find any errors.
Here is a copy of the script:
// Set the word to search for here
var sWord = "forms";
// Source document = current document
var sd = this;
var nWords, currWord, fp, fpa = [], nd;
var fn = sd.documentFileName.replace(/\.pdf$/i, "");
// Loop through the pages
for (var i = 0; i < sd.numPages; i += 1) {
// Get the number of words on the page
nWords = sd.getPageNumWords(i);
// Loop through the words on the page
for (var j = 0; j < nWords; j += 1) {
// Get the current word
currWord = sd.getPageNthWord(i, j);
if (currWord === sWord) {
// Extract the current page to a new file
fp = fn + "_" + i + ".pdf";
fpa.push(fp);
sd.extractPages({nStart: i, nEnd: i, cPath: fp});
// Stop searching this page
break;
}
}
}
// Combine the individual pages into one PDF
if (fpa.length) {
// Open the document that's the first extracted page
nd = app.openDoc({cPath: fpa[0], oDoc: sd});
// Append any other pages that were extracted
if (fpa.length > 1) {
for (var i = 1; i < fpa.length; i += 1) {
nd.insertPages({nPage: i - 1, cPath: fpa[i], nStart: 0, nEnd: 0});
}
}
// Save to a new document and close this one
nd.saveAs({cPath: fn + "_searched.pdf"});
nd.closeDoc({bNoSave: true});
}
I have a large single pdf document which consists of multiple records. Each record usually takes one page however some use 2 pages. A record starts with a defined text, always the same.
My goal is to split this pdf into separate pdfs and the split should happen always before the "header text" is found.
Note: I am looking for a tool or library using java or python. Must be free and available on Win 7.
Any ideas? AFAIK imagemagick won't work for this. May itext do this? I never used and it's
pretty complex so would need some hints.
EDIT:
Marked Answer led me to solution. For completeness here my exact implementation:
public void splitByRegex(String filePath, String regex,
String destinationDirectory, boolean removeBlankPages) throws IOException,
DocumentException {
logger.entry(filePath, regex, destinationDirectory);
destinationDirectory = destinationDirectory == null ? "" : destinationDirectory;
PdfReader reader = null;
Document document = null;
PdfCopy copy = null;
Pattern pattern = Pattern.compile(regex);
try {
reader = new PdfReader(filePath);
final String RESULT = destinationDirectory + "/record%d.pdf";
// loop over all the pages in the original PDF
int n = reader.getNumberOfPages();
for (int i = 1; i < n; i++) {
final String text = PdfTextExtractor.getTextFromPage(reader, i);
if (pattern.matcher(text).find()) {
if (document != null && document.isOpen()) {
logger.debug("Match found. Closing previous Document..");
document.close();
}
String fileName = String.format(RESULT, i);
logger.debug("Match found. Creating new Document " + fileName + "...");
document = new Document();
copy = new PdfCopy(document,
new FileOutputStream(fileName));
document.open();
logger.debug("Adding page to Document...");
copy.addPage(copy.getImportedPage(reader, i));
} else if (document != null && document.isOpen()) {
logger.debug("Found Open Document. Adding additonal page to Document...");
if (removeBlankPages && !isBlankPage(reader, i)){
copy.addPage(copy.getImportedPage(reader, i));
}
}
}
logger.exit();
} finally {
if (document != null && document.isOpen()) {
document.close();
}
if (reader != null) {
reader.close();
}
}
}
private boolean isBlankPage(PdfReader reader, int pageNumber)
throws IOException {
// see http://itext-general.2136553.n4.nabble.com/Detecting-blank-pages-td2144877.html
PdfDictionary pageDict = reader.getPageN(pageNumber);
// We need to examine the resource dictionary for /Font or
// /XObject keys. If either are present, they're almost
// certainly actually used on the page -> not blank.
PdfDictionary resDict = (PdfDictionary) pageDict.get(PdfName.RESOURCES);
if (resDict != null) {
return resDict.get(PdfName.FONT) == null
&& resDict.get(PdfName.XOBJECT) == null;
} else {
return true;
}
}
You can create a tool for your requirements using iText.
Whenever you are looking for code samples concerning (current versions of) the iText library, you should consult iText in Action — 2nd Edition the code samples from which are online and searchable by keyword from here.
In your case the relevant samples are Burst.java and ExtractPageContentSorted2.java.
Burst.java shows how to split one PDF in multiple smaller PDFs. The central code:
PdfReader reader = new PdfReader("allrecords.pdf");
final String RESULT = "record%d.pdf";
// We'll create as many new PDFs as there are pages
Document document;
PdfCopy copy;
// loop over all the pages in the original PDF
int n = reader.getNumberOfPages();
for (int i = 0; i < n; ) {
// step 1
document = new Document();
// step 2
copy = new PdfCopy(document,
new FileOutputStream(String.format(RESULT, ++i)));
// step 3
document.open();
// step 4
copy.addPage(copy.getImportedPage(reader, i));
// step 5
document.close();
}
reader.close();
This sample splits a PDF in single-page PDFs. In your case you need to split by different criteria. But that only means that in the loop you sometimes have to add more than one imported page (and thus decouple loop index and page numbers to import).
To recognize on which pages a new dataset starts, be inspired by ExtractPageContentSorted2.java. This sample shows how to parse the text content of a page to a string. The central code:
PdfReader reader = new PdfReader("allrecords.pdf");
for (int i = 1; i <= reader.getNumberOfPages(); i++) {
System.out.println("\nPage " + i);
System.out.println(PdfTextExtractor.getTextFromPage(reader, i));
}
reader.close();
Simply search for the record start text: If the text from page contains it, a new record starts there.
Apache PDFBox has a PDFSplit utility that you can run from the command-line.
If you like Python, there's a nice library: PyPDF2. The library is pure python2, BSD-like license.
Sample code:
from PyPDF2 import PdfFileWriter, PdfFileReader
input1 = PdfFileReader(open("C:\\Users\\Jarek\\Documents\\x.pdf", "rb"))
# analyze pdf data
print input1.getDocumentInfo()
print input1.getNumPages()
text = input1.getPage(0).extractText()
print text.encode("windows-1250", errors='backslashreplacee')
# create output document
output = PdfFileWriter()
output.addPage(input1.getPage(0))
fout = open("c:\\temp\\1\\y.pdf", "wb")
output.write(fout)
fout.close()
For non coders PDF Content Split is probably the easiest way without reinventing the wheel and has an easy to use interface: http://www.traction-software.co.uk/pdfcontentsplitsa/index.html
hope that helps.
I am using an sdk from pdftron,which reads a single page at a time. My code would be:
PDFDoc doc = new PDFDoc(input_path);
doc.InitSecurityHandler();
PageIterator itr = doc.GetPage(1);
for (line = txt.GetFirstLine(); line.IsValid(); line = line.GetNextLine()){
for (word = line.GetFirstWord(); word.IsValid(); word = word.GetNextWord()){
Console.WriteLine(word.GetString());
}
}
I want to read each and every page, I had posted my same problem in PDFTRON forums.But couldn't get the solution for this.
Is it possible to read each and every pages?
Yes,you can read each and every pages of pdf at a time.You need to do just s slight change initializing page iterator.
I have modified the code,and it works fine.
PDFDoc doc = new PDFDoc(input_path);
doc.InitSecurityHandler();
PageIterator itr = doc.GetPageIterator();
for (; itr.HasNext(); itr.Next()) // Read every page
{
for (line = txt.GetFirstLine(); line.IsValid(); line = line.GetNextLine())
{
for (word = line.GetFirstWord(); word.IsValid(); word = word.GetNextWord())
{
Console.WriteLine(word.GetString());
}
}
}
Hope this will help you.
Dear Team,
In my application, i want to split the pdf using itextsharp. If i upload PDF contains 10 pages with file size 10 mb for split, After splitting the combine file size of each pdfs will result into above 20mb file size. If this possible to reduce the file size(each pdf).
Please help me to solve the issue.
Thanks in advance
This may have to do with the resources in the file. If the original document uses an embedded font on each, for example, then there will only be one instance of the font in the original file. When you split it, each file will be required have that font as well. The total overhead will be n pages × sizeof(each font). Elements that will cause this kind of bloat include fonts, images, color profiles, document templates (aka forms), XMP, etc.
And while it doesn't help you in your immediate problem, if you use the PDF tools in Atalasoft dotImage, your task becomes a 1 liner:
PdfDocument.Separate(userpassword, ownerpassword, origPath, destFolder, "Separated Page{0}.pdf", true);
which will take the PDF in orig file and create new pages in the dest folder each named with the pattern. The bool at the end is to overwrite an existing file.
Disclaimer: I work for Atalasoft and wrote the PDF library (also used to work at Adobe on Acrobat versions 1, 2, 3, and 4).
Hi Guys i modified the above code to split a PDF file into multiple Pdf file.
iTextSharp.text.pdf.PdfReader reader = null;
int currentPage = 1;
int pageCount = 0;
//string filepath_New = filepath + "\\PDFDestination\\";
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
//byte[] arrayofPassword = encoding.GetBytes(ExistingFilePassword);
reader = new iTextSharp.text.pdf.PdfReader(filepath);
reader.RemoveUnusedObjects();
pageCount = reader.NumberOfPages;
string ext = System.IO.Path.GetExtension(filepath);
for (int i = 1; i <= pageCount; i++)
{
iTextSharp.text.pdf.PdfReader reader1 = new iTextSharp.text.pdf.PdfReader(filepath);
string outfile = filepath.Replace((System.IO.Path.GetFileName(filepath)), (System.IO.Path.GetFileName(filepath).Replace(".pdf", "") + "_" + i.ToString()) + ext);
reader1.RemoveUnusedObjects();
iTextSharp.text.Document doc = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(currentPage));
iTextSharp.text.pdf.PdfCopy pdfCpy = new iTextSharp.text.pdf.PdfCopy(doc, new System.IO.FileStream(outfile, System.IO.FileMode.Create));
doc.Open();
for (int j = 1; j <= 1; j++)
{
iTextSharp.text.pdf.PdfImportedPage page = pdfCpy.GetImportedPage(reader1, currentPage);
pdfCpy.SetFullCompression();
pdfCpy.AddPage(page);
currentPage += 1;
}
doc.Close();
pdfCpy.Close();
reader1.Close();
reader.Close();
}
Have you tried setting the compression on the writer?
Document doc = new Document();
using (MemoryStream ms = new MemoryStream())
{
PdfWriter writer = PdfWriter.GetInstance(doc, ms);
writer.SetFullCompression();
}
I am trying to automate the process of scanning/cropping photos in Photoshop. I need to scan 3 photos at a time, then use Photoshop's Crop and Straighten Photos command, which creates 3 separate images. After that I'd like to save each of the newly created images as a PNG.
I looked at the JSX scripts and they seem to a lot of promise. Is what I described possible to automate in Photoshop using JavaScript or VBScript or whatever?
I just found this script just did the work for me! It automatically crop & straighten the photo and save each result to directory you specified.
http://www.tranberry.com/photoshop/photoshop_scripting/PS4GeeksOrlando/IntroScripts/cropAndStraightenBatch.jsx
Save it to local then run it in the PS=>File=>Command=>Browse
P.S I found in the comment it said the script can be executed directly by double clicking from Mac Finder or Windows Explorer.
Backup gist for the script here
I actually got the answer on the Photoshop forums over at adobe. It turns out that Photoshop CS4 is totally scriptable via JavaScript, VBScript and comes with a really kick-ass Developer IDE, that has everything you'd expect (debugger, watch window, color coding and more). I was totally impressed.
Following is an extract for reference:
you can run the following script that will create a new folder off the existing one and batch split all the files naming them existingFileName#001.png and put them in the new folder (edited)
#target Photoshop
app.bringToFront;
var inFolder = Folder.selectDialog("Please select folder to process");
if(inFolder != null){
var fileList = inFolder.getFiles(/\.(jpg|tif|psd|)$/i);
var outfolder = new Folder(decodeURI(inFolder) + "/Edited");
if (outfolder.exists == false) outfolder.create();
for(var a = 0 ;a < fileList.length; a++){
if(fileList[a] instanceof File){
var doc= open(fileList[a]);
doc.flatten();
var docname = fileList[a].name.slice(0,-4);
CropStraighten();
doc.close(SaveOptions.DONOTSAVECHANGES);
var count = 1;
while(app.documents.length){
var saveFile = new File(decodeURI(outfolder) + "/" + docname +"#"+ zeroPad(count,3) + ".png");
SavePNG(saveFile);
activeDocument.close(SaveOptions.DONOTSAVECHANGES) ;
count++;
}
}
}
};
function CropStraighten() {
function cTID(s) { return app.charIDToTypeID(s); };
function sTID(s) { return app.stringIDToTypeID(s); };
executeAction( sTID('CropPhotosAuto0001'), undefined, DialogModes.NO );
};
function SavePNG(saveFile){
pngSaveOptions = new PNGSaveOptions();
pngSaveOptions.embedColorProfile = true;
pngSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
pngSaveOptions.matte = MatteType.NONE;
pngSaveOptions.quality = 1;
pngSaveOptions.PNG8 = false; //24 bit PNG
pngSaveOptions.transparency = true;
activeDocument.saveAs(saveFile, pngSaveOptions, true, Extension.LOWERCASE);
}
function zeroPad(n, s) {
n = n.toString();
while (n.length < s) n = '0' + n;
return n;
};
Visit here for complete post.
Have you tried using Photoshop Actions? I don't now about the scanning part, but the rest can all be done by actions quite easily.