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How can I convert a string of pdf code into a blob?

I briefly summarize my problem:
I'm calling an API that returns a pdf like
"% PDF-1.4%%1 0 obj
<<
/ Type / Catalog/ PageLayout / OneColumn/
Pages 2 0 R/ PageMode / UseNone
......... "
currently, I receive it in string format to be able to make changes and so far so good, but after making changes I would like to convert the string to blob to download the pdf. In doing this I am having problems, the text string converted to blob does not generate the correct pdf, or rather the pdf once opened is white, when in reality it should have data.
The code I'm using now is the following:
response.text().then((content) => {
//...TODO: Modify pdf
var blob = new Blob([content], { type: "application/pdf" });
saveAs(blob, "invoice.pdf");
}).catch(error => {
console.log(error);
});
The pdf is downloaded but if I open it it is empty.
I would like to be able to modify the pdf string and convert it back into a blob to be able to download it.
Does anyone have an idea how I could do it?

A PDF consists of a set of objects in a non-trivial fashion. If you are receiving it as a string and are using standard string manipulation functions on it, e.g. find and replace you are most likely going to corrupt it. You would have to edit in accord with the standards laid out in the PDF specification and not violate the syntax. This is a very fragile approach, you need to use a PDF library instead to edit your PDF content.

How to get custom ttf font working with jsPDF.output()

I've added the jsPDF library to my Titanium project to generate PDFs client side, which has been working great. But now I want to localize the app for Arabic countries, which means that I have the add a custom font. This works perfectly if you use doc.save('file.pdf'), but it doesn't seem to work correctly for doc.output(). I have to use output because I'm using jsPDF outside of a browser.
To make the library work in Titanium I've had to strip all of the references to window, because it's not running in a browser or webview.
I've tried writing the file from different sources, but nothing seems to yield any results.
My current implementation:
doc = new jsPDF();
var f = Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, 'fonts/markazi-text.regular.ttf');
var contents = f.read();
var base64font = Ti.Utils.base64encode(contents).toString();
doc.addFileToVFS("MarkaziText-Regular", base64font);
doc.addFont('MarkaziText-Regular', 'markazi-text', 'normal');
doc.setFontSize(20);
doc.setFont('markazi-text', 'normal');
doc.text('The quick brown fox jumps over the lazy dog', 20, 20);
var tempFile = Ti.Filesystem.getFile(Ti.Filesystem.getTempDirectory(), 'report.pdf');
if (tempFile.exists()) {
tempFile.deleteFile();
}
tempFile.write(doc.output());
I've also tried to write the file from a blob:
var reader = new FileReader();
reader.onloadend = function () {
tempFile.write(reader.result);
};
reader.readAsText(getBlob(buildDocument()));
But the pdf is empty if I use this. I've also tried the library in a webview within a titanium application, which does work but I don't really want to go that road. It would require too many changes to the code.
Expected:
Actual:

I've finally resolved it by creating a local HTML file. In this HTML file I've loaded jsPDF and my own JavaScript to generate a PDF file. I've loaded this HTML file in a WebView.
I'm generating all the data needed for the PDF in an Alloy controller. I'm sending this data to my WebView JavaScript by firing an app event and catching it in the WebView.
After the PDF is created I trigger an app event in the WebView that contains the base64 data of the jsPDF doc:
Ti.App.fireEvent('app:pdfdone', {
output: doc.output('dataurlstring').replace("data:application/pdf;filename=generated.pdf;base64,", "")
});
I finally save this as a file in the Alloy controller:
var f = Ti.Filesystem.getFile(Ti.Filesystem.getTempDirectory(), 'doc.pdf');
f.write(Ti.Utils.base64decode(e.output));

Print Image in Server side on Button Click by Client [duplicate]

Ok, so I'm trying to print from a webpage (the typical "print" button, but I don't want the print dialog to appear) so I decided to use my already existing node.js backend to do the task (mainly because printing from browser is nearly impossible without the printing dialog).
I found the node-printer (https://github.com/tojocky/node-printer) module, and it works great, but only with text. I tried to send RAW data, but what it does is printing the raw characters. What I actually need is to print a logo, along with some turn information (this is for a customer care facility).
Also, the printer must be installed locally, so I can't use IPP.
Is there any way to print an image, or a combination of images and text with node.js? can it be done through node-printer or is there another way?

I ended calling an exe to do the work for me. I use a child_process to call printhtml, which does all the printing work for me. My code ended this way:
var exec = require('child_process').exec;
exec('printhtml.exe file=file.html', function(err, data) {
console.log(data.toString());
});

Actually, you can print image using node-printer. This work for me
var Printer = require('node-printer');
var fs = require('fs');
// Get available printers list
var listPrinter = Printer.list();
// Create a new Pinter from available devices
var printer = new Printer('YOUR PRINTER HERE. GET IT FROM listPrinter');
// Print from a buffer, file path or text
var fileBuffer = fs.readFileSync('PATH TO YOUR IMAGE');
var jobFromBuffer = printer.printBuffer(fileBuffer);
// Listen events from job
jobFromBuffer.once('sent', function() {
jobFromBuffer.on('completed', function() {
console.log('Job ' + jobFromBuffer.identifier + 'has been printed');
jobFromBuffer.removeAllListeners();
});
});

I had success with the Node IPP package https://www.npmjs.com/package/ipp.
The example code on the docs, which uses another node module PDFKIT to convert your html/file into a PDF, does not work. See my answer here: Cannot print with node js ipp module for a working example.

Insert Image to Word Doc File From SQL Server

I want to export image which is displayed on web page. This image is stored in Sql image data type. While displaying image I am converting the image to Base64String.
Image1.ImageUrl = "data:image/jpg;base64," & Convert.ToBase64String(imgPhoto)
While exporting page, image is not displaying in word document file.
I can not store image on the server because of security reason.
below code is for export to word file.
Response.AddHeader("content-disposition", "attachment;filename=Test.doc")
Response.Cache.SetCacheability(HttpCacheability.NoCache)
Response.ContentType = "application/ms-word "
Response.Charset = ""
Dim stringWrite As New System.IO.StringWriter()
Dim htmlWrite As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(stringWrite)
' Create a form to contain the grid
ControlID.RenderControl(htmlWrite)
Dim stringWrite1 As New System.IO.StringWriter()
Dim htmlWrite1 As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(stringWrite1)
' Create a form to contain the grid
ImageLogo.RenderControl(htmlWrite1)
Response.Write(stringWrite1.ToString() & stringWrite.ToString())
Response.[End]()

You really aren't creating a Word document, just rendering the HTML to a word MIME type. I don't believe word supports the data:image definition since that is much newer than the pre-2007 word format. Instead, try the OpenXML SDK. Although it creates Word 2007+ documents only, most people can view them. The OpenXML SDK will enable you to create a real word doc and create an image from the binary image data.
http://www.microsoft.com/en-us/download/details.aspx?id=30425
http://msdn.microsoft.com/en-us/library/office/bb448854%28v=office.15%29.aspx

How to print a PDF from a web page

Does anybody know how to make a print page button print a pdf document?
At the moment i'm using
Print Page
Obviously that just prints the page though. I have had to create pdf's for each page and thought it would be easier just to print the pdf instead of the page (Cross browser printing styles is kinda sucking ;).
Any ideas?

There is no standard way to print anything in PDF in any browser, such as on the Windows platform. On the Mac, there is always an option to print something as a PDF file, so regular printing will do.

I suggest you use Itextsharp. If you are using asp.net c#, this code works for you. Runs in the server side though. You can just put the html inside a panel to make it readable in the server.
/// import these namespaces
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html.simpleparser;
using System.Web.Services;
using System.Text;
/// Call this method whenever you need to convert
/// the html content inside the panel which runs in the server side.
[WebMethod]
public void ConvertHtmlStringToPDF()
{
StringBuilder sb = new StringBuilder();
StringWriter tw = new StringWriter(sb);
HtmlTextWriter hw = new HtmlTextWriter(tw);
pnlPDF.RenderControl(hw);
string htmlDisplayText = sb.ToString();
Document document = new Document();
MemoryStream ms = new MemoryStream();
PdfWriter writer = PdfWriter.GetInstance(document, ms);
StringReader se = new StringReader(htmlDisplayText);
HTMLWorker obj = new HTMLWorker(document);
document.Open();
obj.Parse(se);
// step 5: we close the document
document.Close();
Response.Clear();
Response.AddHeader("content-disposition", "attachment; filename=report.pdf");
Response.ContentType = "application/pdf";
Response.Buffer = true;
Response.OutputStream.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);
Response.OutputStream.Flush();
Response.End();
}