Re: write text to pdf

Hi,

I have a pdf file and i want to write a number to it. I can't find how to do this. I'm using V17.

thanks for helping!

This depends on how exactly do you want the result PDF. Do you want it to be searchable PDF or Raster PDF?

In general, there are at least 2 ways to do it:
1) Draw the text on an image and save it as raster (bitmap image) PDF using our PDF plug-in.
2) Create a document page and have the text saved in PDF format as searchable text using our Document Writer.

The details of this depend on the programming interface you are using. Which LEADTOOLS programming interface (Main OCX, .NET classes, DLL API, C++ Classes, etc.) are you using?

Sorry for my late reaction. Im using C# .NET. What i want to do is the following thing:

Open the image pdf file (from a scan), add text to it (just a simple number to recognize the PDF afterwards) and save it as searchable PDF.

The best approach would be to load the PDF using our PDF read plug-in into a RasterImage, draw the text on the RasterImage using .NET Graphics methods (such as Graphics.DrawString), perform Optical Character Recognition (OCR) on the loaded image using our OCR Module, and then save the recognition result as searchable PDF using our DocumentWriter features.
To get you started, download the main free evaluation version of LEADTOOLS toolkits from our website, and check the OCR Main Demo from the following start menu item:

LEADTOOLS 17 =>.NET Class Libraries => .NET Framework => 02 Document => 03 OCR - ICR - OMR => 01 Main Demo

We already bought the leadtools toolkit. But I can't find how to draw a string on a RasterImage. How should I create a graphics object from the RasterImage?

Regarding drawing text on a RasterImage, you can check the code in the following forum post:
http://support.leadtools.com/SupportPortal/CS/forums/3432/ShowPost.aspx#3432

I want to clarify one thing about your requirements. Do you want the text in the scanned image (PDF) to be recognized so both the new added text and the original image are searchable, or do you only want the added text to be searchable?

Hi!

I tried this, but i dont have the CreateGdiPlusGraphics() on my rasterimage object. Which dll contains this function, cause maybe i'm just missing some references?

I want the whole text of the pdf to be searchable. I've found how to do this, the only thing im facing is that sometimes (not even always) I'm getting an exception on the "ocrDocument.Pages.AutoZone" function. I can't handle this error (it's in a try catch block) and the process just gets killed.

Thanks for your help!

What is the build number (file version info) of the Leadtools.dll and Leadtools.Winforms.dll?

Regarding the exception with AutoZone function, please create a separate forum thread or send an email to support@leadtools.com regarding this issue and provide more details.

the file version info is 17.0.0.10 for Leadtools.dll and 17.0.0.3 for Leadtools.Winforms.dll

The sample in the forum post is for older LEADTOOLS version. The rest of the code should be similar but in LEADTOOLS version 17, the RasterImage.CreateGdiPlusGraphics method has been replaced with the Leadtools.Drawing.RasterImageGdiPlusGraphicsContainer(RasterImage) method.
Please see the following help topics:
- 'RasterImageGdiPlusGraphicsContainer Class'
- 'Leadtools Assembly Changes'

That was the method i was searching for. It works fine now. Thanks for your help!