subject:"Spaces are ignored when reading a PDF file"

Re: Spaces are ignored when reading a PDF file

2016-03-20 Thread John Hewson

This subject of this thread is "Spaces are ignored when reading a PDF file. 
Please post new questions to a new thread.

— John

> On 18 Mar 2016, at 04:02, 风云天空 <1010800...@qq.com> wrote:
> 
> who can help me 
> i get this error in multithreading
> java.lang.NullPointerException
>   at 
> java.awt.color.ICC_Profile.activateDeferredProfile(ICC_Profile.java:1086)
>   at java.awt.color.ICC_Profile$1.activate(ICC_Profile.java:742)
>   at 
> sun.java2d.cmm.ProfileDeferralMgr.activateProfiles(ProfileDeferralMgr.java:95)
>   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:775)
>   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:1013)
>   at 
> org.apache.pdfbox.pdmodel.graphics.color.PDICCBased.loadICCProfile(PDICCBased.java:119)
>   at 
> org.apache.pdfbox.pdmodel.graphics.color.PDICCBased.(PDICCBased.java:89)
>   at 
> org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace.create(PDColorSpace.java:182)
>   at 
> org.apache.pdfbox.pdmodel.PDResources.getColorSpace(PDResources.java:172)
>   at 
> org.apache.pdfbox.pdmodel.PDResources.getColorSpace(PDResources.java:142)
>   at 
> org.apache.pdfbox.contentstream.operator.color.SetNonStrokingColorSpace.process(SetNonStrokingColorSpace.java:41)
>   at 
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:814)
>   at 
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:471)
>   at 
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:445)
>   at 
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:149)
>   at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:187)
>   at 
> org.apache.pdfbox.rendering.PDFRenderer.renderPage(PDFRenderer.java:208)
>   at 
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:139)
>   at 
> org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:80)
>   at 
> com.liaoyoujin.pdfbox.doc.PdfExtractor.getFirstImage(PdfExtractor.java:109)
>   at com.liaoyoujin.pdfbox.doc.PdfExtractor$Job.run(PdfExtractor.java:178)
>   at 
> com.liaoyoujin.thread.pool.BlockThreadPool$Worker.run(BlockThreadPool.java:53)
>   at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>   at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>   at java.lang.Thread.run(Thread.java:745)
> java.util.ConcurrentModificationException
>   at java.util.Vector$Itr.checkForComodification(Vector.java:1156)
>   at java.util.Vector$Itr.next(Vector.java:1133)
> 
> 
> 
> ------ 原始邮件 ----------
> 发件人: "Hesham G.";<heshamgne...@gmail.com>;
> 发送时间: 2016年3月18日(星期五) 下午4:44
> 收件人: "users"<users@pdfbox.apache.org>; 
> 
> 主题: Re: Spaces are ignored when reading a PDF file
> 
> 
> 
>   John,
> 
> I think I have got the idea ... Thumps up 
> 
> 
> Best regards ,
> Hesham 
> 
> 
> Included message :
> 
> I’m rather confused by this thread, inferring spaces is one of the the main  
> features of PDFTextStripper. I’m not sure why anyone is suggesting to process 
>  the text manually - there’s no need to do that. We do that already!
> 
> Looking at the original code the problem is right here:
> 
>> public class PDFTextStripperProcessor extends PDFTextStripper {
>>   @Override
>>   public void processTextPosition( TextPosition text  )  {
>>   System.out.println(  text.getCharacter() );
>>   }
>> }
> 
> The processTextPosition method is used to pass an unprocessed TextPosition  
> *in* to PDFTextStripper, but this override prevents that from happening, and 
> is  just printing the unprocessed token before PDFTextStripper has had a 
> chance to  do its job, such as inferring the missing spaces.
> 
> You should follow our PrintTextLocations.java example which shows you how  to 
> get the processed TextPositions from PDFTextStripper. It’s really easy to  do.
> 
> — John
> 
>> On 17 Mar 2016, at 04:44, Hesham G. <heshamgne...@gmail.com>  wrote:
>> 
>> Andreas,
>> 
>> You're absolutely right. I am testing it now, but it seems very  
>> complicated. I hope there might be another easier solution.
>> 
>> 
>> Best regards ,
>> Hesham
>> 
>> 
>> Included message :
>> 
>>> "Hesham G." <heshamgne...@g

回复： Spaces are ignored when reading a PDF file

2016-03-19 Thread 风云天空

who can help me 
i get this error in multithreading
java.lang.NullPointerException
at 
java.awt.color.ICC_Profile.activateDeferredProfile(ICC_Profile.java:1086)
at java.awt.color.ICC_Profile$1.activate(ICC_Profile.java:742)
at 
sun.java2d.cmm.ProfileDeferralMgr.activateProfiles(ProfileDeferralMgr.java:95)
at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:775)
at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:1013)
at 
org.apache.pdfbox.pdmodel.graphics.color.PDICCBased.loadICCProfile(PDICCBased.java:119)
at 
org.apache.pdfbox.pdmodel.graphics.color.PDICCBased.(PDICCBased.java:89)
at 
org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace.create(PDColorSpace.java:182)
at 
org.apache.pdfbox.pdmodel.PDResources.getColorSpace(PDResources.java:172)
at 
org.apache.pdfbox.pdmodel.PDResources.getColorSpace(PDResources.java:142)
at 
org.apache.pdfbox.contentstream.operator.color.SetNonStrokingColorSpace.process(SetNonStrokingColorSpace.java:41)
at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:814)
at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:471)
at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:445)
at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:149)
at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:187)
at 
org.apache.pdfbox.rendering.PDFRenderer.renderPage(PDFRenderer.java:208)
at 
org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:139)
at 
org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:80)
at 
com.liaoyoujin.pdfbox.doc.PdfExtractor.getFirstImage(PdfExtractor.java:109)
at com.liaoyoujin.pdfbox.doc.PdfExtractor$Job.run(PdfExtractor.java:178)
at 
com.liaoyoujin.thread.pool.BlockThreadPool$Worker.run(BlockThreadPool.java:53)
at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
java.util.ConcurrentModificationException
at java.util.Vector$Itr.checkForComodification(Vector.java:1156)
at java.util.Vector$Itr.next(Vector.java:1133)



-- 原始邮件 --
发件人: "Hesham G.";<heshamgne...@gmail.com>;
发送时间: 2016年3月18日(星期五) 下午4:44
收件人: "users"<users@pdfbox.apache.org>; 

主题: Re: Spaces are ignored when reading a PDF file



   John,
  
 I think I have got the idea ... Thumps up 
  
  
 Best regards ,
 Hesham 
  
 
 Included message :
  
 I’m rather confused by this thread, inferring spaces is one of the the main  
features of PDFTextStripper. I’m not sure why anyone is suggesting to process  
the text manually - there’s no need to do that. We do that already!
  
 Looking at the original code the problem is right here:
  
 > public class PDFTextStripperProcessor extends PDFTextStripper {
 >@Override
 >public void processTextPosition( TextPosition text  )  {
 >System.out.println(  text.getCharacter() );
 >}
 > }
  
 The processTextPosition method is used to pass an unprocessed TextPosition  
*in* to PDFTextStripper, but this override prevents that from happening, and is 
 just printing the unprocessed token before PDFTextStripper has had a chance to 
 do its job, such as inferring the missing spaces.
  
 You should follow our PrintTextLocations.java example which shows you how  to 
get the processed TextPositions from PDFTextStripper. It’s really easy to  do.
  
 — John
  
 > On 17 Mar 2016, at 04:44, Hesham G. <heshamgne...@gmail.com>  wrote:
 > 
 > Andreas,
 > 
 > You're absolutely right. I am testing it now, but it seems very  
 > complicated. I hope there might be another easier solution.
 > 
 > 
 > Best regards ,
 > Hesham
 > 
 >  
 > Included message :
 > 
 >> "Hesham G." <heshamgne...@gmail.com> hat am 17. März 2016 um  11:20
 >> geschrieben:
 >> 
 >> 
 >> Andreas,
 >> 
 >> That is very helpful.
 >> 
 >> I can get the x location of each character using  TextPosition.getX(), ex:
 >> W: 102.88399
 >> i: 114.18165
 >> t: 117.660614
 >> h: 121.55801
 >> d: 133.09477
 >> u: 140.3994
 >> e: 147.60838
 >> 
 >> So to detect the space between the 2 words "With" & "due"  should I make
 >> subtraction calculations between X of the last letter(h) and the X  of the
 >> first letter (d)

Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread clovis

just an idea from whom is not fluent in pdfbox nor PDF.
if you just want to know there is a space in between the letters and not
the amount of spaces, you can use your code to get character details and
then use extractText to get the words.

2016-03-17 7:20 GMT-03:00 Hesham G. :

> Andreas,
>
> That is very helpful.
>
> I can get the x location of each character using TextPosition.getX(), ex:
> W: 102.88399
> i: 114.18165
> t: 117.660614
> h: 121.55801
> d: 133.09477
> u: 140.3994
> e: 147.60838
>
> So to detect the space between the 2 words "With" & "due" should I make
> subtraction calculations between X of the last letter(h) and the X of the
> first letter (d) and if the number is large than normal then this is a
> space? I think this way might be risky in the detection, or what?
>
>
> Best regards ,
> Hesham
>
> 
> Included message :
>
> Hi,
>
> Frank van der Hulst  hat am 17. März 2016 um
>> 08:34
>> geschrieben:
>>
>>
>> Spaces don't exist as characters in PDFs. To identify spaces, you have to
>> compare the X coordinates of adjacent characters against their widths.
>>
> That's not correct, spaces exist but in most cases pdf engines omit them
> and
> replace spaces by a splitted text with an appropriate positioning.
>
> BTW, latex uses the same strategy. Here is a excerpt from your pdf:
>
>   [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383
> (Article)
> -384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has)
> -384
> (the) -383 (right) ] TJ
>
> The text is in between the braces and the numbers are used for horizontal
> positioning.
>
> BR
> Andreas
>
>
>> On Thu, Mar 17, 2016 at 7:12 PM, Hesham G. 
>> wrote:
>>
>> > Hello ,
>> >
>> > I have a PDF file created using Latex. I am trying to read and print all
>> > letters in that file using PDFBox, but when doing this all spaces in >
>> that
>> > file are ignored. Here is the code I am using:
>> > PDPage page = (PDPage)allPages.get( 0 );
>> > PDStream contents = page.getContents();
>> > if ( contents != null ) {
>> > PDFTextStripperProcessor pdfTextStripperProcessor = new
>> > PDFTextStripperProcessor();
>> > pdfTextStripperProcessor.processStream( page, page.findResources(),
>> > contents.getStream() );
>> > }
>> >
>> > public class PDFTextStripperProcessor extends PDFTextStripper {
>> > @Override
>> > public void processTextPosition( TextPosition text )  {
>> > System.out.println( text.getCharacter() );
>> > }
>> > }
>> >
>> > And you can check a one page file sample here to test it:
>> >
>> >
>> https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
>> >
>> > What is the cause of this issue please?
>> >
>> >
>> > Best regards ,
>> > Hesham
>>
>
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Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Tilman Hausherr


Am 17.03.2016 um 11:20 schrieb Hesham G.:


So to detect the space between the 2 words "With" & "due" should I 
make subtraction calculations between X of the last letter(h) and the 
X of the first letter (d) and if the number is large than normal then 
this is a space? I think this way might be risky in the detection, or 
what? 


What you're doing is to reinvent the PDFTextStripper code, which has 
some strategies to decide where there are spaces. That's not a bad idea 
(there are some weaknesses), however it is indeed... "tricky".


https://www.youtube.com/watch?v=cjEdxO91RWQ=youtu.be=3m33s



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Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Andreas Lehmkühler

Hi,

> Frank van der Hulst  hat am 17. März 2016 um 08:34
> geschrieben:
> 
> 
> Spaces don't exist as characters in PDFs. To identify spaces, you have to
> compare the X coordinates of adjacent characters against their widths.
That's not correct, spaces exist but in most cases pdf engines omit them and
replace spaces by a splitted text with an appropriate positioning.

BTW, latex uses the same strategy. Here is a excerpt from your pdf:

   [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383 (Article)
-384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has) -384
(the) -383 (right) ] TJ

The text is in between the braces and the numbers are used for horizontal
positioning.

BR
Andreas

> 
> On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  wrote:
> 
> > Hello ,
> >
> > I have a PDF file created using Latex. I am trying to read and print all
> > letters in that file using PDFBox, but when doing this all spaces in that
> > file are ignored. Here is the code I am using:
> > PDPage page = (PDPage)allPages.get( 0 );
> > PDStream contents = page.getContents();
> > if ( contents != null ) {
> > PDFTextStripperProcessor pdfTextStripperProcessor = new
> > PDFTextStripperProcessor();
> > pdfTextStripperProcessor.processStream( page, page.findResources(),
> > contents.getStream() );
> > }
> >
> > public class PDFTextStripperProcessor extends PDFTextStripper {
> > @Override
> > public void processTextPosition( TextPosition text )  {
> > System.out.println( text.getCharacter() );
> > }
> > }
> >
> > And you can check a one page file sample here to test it:
> >
> > https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
> >
> > What is the cause of this issue please?
> >
> >
> > Best regards ,
> > Hesham

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Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Hesham G.

Andreas,

That is very helpful.

I can get the x location of each character using TextPosition.getX(), ex:
W: 102.88399
i: 114.18165
t: 117.660614
h: 121.55801
d: 133.09477
u: 140.3994
e: 147.60838

So to detect the space between the 2 words "With" & "due" should I make 
subtraction calculations between X of the last letter(h) and the X of the 
first letter (d) and if the number is large than normal then this is a 
space? I think this way might be risky in the detection, or what?

Best regards ,
Hesham

Included message :

Hi,

Frank van der Hulst  hat am 17. März 2016 um 
08:34

geschrieben:

Spaces don't exist as characters in PDFs. To identify spaces, you have to
compare the X coordinates of adjacent characters against their widths.

That's not correct, spaces exist but in most cases pdf engines omit them and
replace spaces by a splitted text with an appropriate positioning.

BTW, latex uses the same strategy. Here is a excerpt from your pdf:

  [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383 
(Article)

-384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has) -384
(the) -383 (right) ] TJ

The text is in between the braces and the numbers are used for horizontal
positioning.

BR
Andreas

On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  wrote:

> Hello ,
>
> I have a PDF file created using Latex. I am trying to read and print all
> letters in that file using PDFBox, but when doing this all spaces in 
> that

> file are ignored. Here is the code I am using:
> PDPage page = (PDPage)allPages.get( 0 );
> PDStream contents = page.getContents();
> if ( contents != null ) {
> PDFTextStripperProcessor pdfTextStripperProcessor = new
> PDFTextStripperProcessor();
> pdfTextStripperProcessor.processStream( page, page.findResources(),
> contents.getStream() );
> }
>
> public class PDFTextStripperProcessor extends PDFTextStripper {
> @Override
> public void processTextPosition( TextPosition text )  {
> System.out.println( text.getCharacter() );
> }
> }
>
> And you can check a one page file sample here to test it:
>
> 
https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
>
> What is the cause of this issue please?
>
>
> Best regards ,
> Hesham

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Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Hesham G.


Andreas,

You're absolutely right. I am testing it now, but it seems very complicated. 
I hope there might be another easier solution.



Best regards ,
Hesham


Included message :


"Hesham G."  hat am 17. März 2016 um 11:20
geschrieben:


Andreas,

That is very helpful.

I can get the x location of each character using TextPosition.getX(), ex:
W: 102.88399
i: 114.18165
t: 117.660614
h: 121.55801
d: 133.09477
u: 140.3994
e: 147.60838

So to detect the space between the 2 words "With" & "due" should I make
subtraction calculations between X of the last letter(h) and the X of the
first letter (d) and if the number is large than normal then this is a
space? I think this way might be risky in the detection, or what?
That's the short story. To decide what is normal could be quite tricky. You 
have

to take the following facts into account:

- different fonts have different widths (important if the font before the 
space

isn't the same than the font after the space)
- keep in mind that you have to take a scaling and sometimes a rotation into
account
- the "space" between characters may vary if the text is jusitified

There are certainly some other details which may be important as well, so 
that

you end up with some more or less heuristic.

BR
Andreas


Best regards ,
Hesham


Included message :

Hi,

> Frank van der Hulst  hat am 17. März 2016 um
> 08:34
> geschrieben:
>
>
> Spaces don't exist as characters in PDFs. To identify spaces, you have 
> to

> compare the X coordinates of adjacent characters against their widths.
That's not correct, spaces exist but in most cases pdf engines omit them 
and

replace spaces by a splitted text with an appropriate positioning.

BTW, latex uses the same strategy. Here is a excerpt from your pdf:

   [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383
(Article)
-384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 
(has) -384

(the) -383 (right) ] TJ

The text is in between the braces and the numbers are used for horizontal
positioning.

BR
Andreas

>
> On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  
> wrote:

>
> > Hello ,
> >
> > I have a PDF file created using Latex. I am trying to read and print 
> > all

> > letters in that file using PDFBox, but when doing this all spaces in
> > that
> > file are ignored. Here is the code I am using:
> > PDPage page = (PDPage)allPages.get( 0 );
> > PDStream contents = page.getContents();
> > if ( contents != null ) {
> > PDFTextStripperProcessor pdfTextStripperProcessor = new
> > PDFTextStripperProcessor();
> > pdfTextStripperProcessor.processStream( page, 
> > page.findResources(),

> > contents.getStream() );
> > }
> >
> > public class PDFTextStripperProcessor extends PDFTextStripper {
> > @Override
> > public void processTextPosition( TextPosition text )  {
> > System.out.println( text.getCharacter() );
> > }
> > }
> >
> > And you can check a one page file sample here to test it:
> >
> > 
https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
> >
> > What is the cause of this issue please?
> >
> >
> > Best regards ,
> > Hesham

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Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Hesham G.

John,

I think I have got the idea ... Thumps up 


Best regards ,
Hesham 


Included message :

I’m rather confused by this thread, inferring spaces is one of the the main 
features of PDFTextStripper. I’m not sure why anyone is suggesting to process 
the text manually - there’s no need to do that. We do that already!

Looking at the original code the problem is right here:

> public class PDFTextStripperProcessor extends PDFTextStripper {
>@Override
>public void processTextPosition( TextPosition text )  {
>System.out.println( text.getCharacter() );
>}
> }

The processTextPosition method is used to pass an unprocessed TextPosition *in* 
to PDFTextStripper, but this override prevents that from happening, and is just 
printing the unprocessed token before PDFTextStripper has had a chance to do 
its job, such as inferring the missing spaces.

You should follow our PrintTextLocations.java example which shows you how to 
get the processed TextPositions from PDFTextStripper. It’s really easy to do.

— John

> On 17 Mar 2016, at 04:44, Hesham G.  wrote:
> 
> Andreas,
> 
> You're absolutely right. I am testing it now, but it seems very complicated. 
> I hope there might be another easier solution.
> 
> 
> Best regards ,
> Hesham
> 
> 
> Included message :
> 
>> "Hesham G."  hat am 17. März 2016 um 11:20
>> geschrieben:
>> 
>> 
>> Andreas,
>> 
>> That is very helpful.
>> 
>> I can get the x location of each character using TextPosition.getX(), ex:
>> W: 102.88399
>> i: 114.18165
>> t: 117.660614
>> h: 121.55801
>> d: 133.09477
>> u: 140.3994
>> e: 147.60838
>> 
>> So to detect the space between the 2 words "With" & "due" should I make
>> subtraction calculations between X of the last letter(h) and the X of the
>> first letter (d) and if the number is large than normal then this is a
>> space? I think this way might be risky in the detection, or what?
> That's the short story. To decide what is normal could be quite tricky. You 
> have
> to take the following facts into account:
> 
> - different fonts have different widths (important if the font before the 
> space
> isn't the same than the font after the space)
> - keep in mind that you have to take a scaling and sometimes a rotation into
> account
> - the "space" between characters may vary if the text is jusitified
> 
> There are certainly some other details which may be important as well, so that
> you end up with some more or less heuristic.
> 
> BR
> Andreas
> 
>> Best regards ,
>> Hesham
>> 
>> 
>> Included message :
>> 
>> Hi,
>> 
>> > Frank van der Hulst  hat am 17. März 2016 um
>> > 08:34
>> > geschrieben:
>> >
>> >
>> > Spaces don't exist as characters in PDFs. To identify spaces, you have > to
>> > compare the X coordinates of adjacent characters against their widths.
>> That's not correct, spaces exist but in most cases pdf engines omit them and
>> replace spaces by a splitted text with an appropriate positioning.
>> 
>> BTW, latex uses the same strategy. Here is a excerpt from your pdf:
>> 
>>   [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383
>> (Article)
>> -384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has) -384
>> (the) -383 (right) ] TJ
>> 
>> The text is in between the braces and the numbers are used for horizontal
>> positioning.
>> 
>> BR
>> Andreas
>> 
>> >
>> > On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  > 
>> > wrote:
>> >
>> > > Hello ,
>> > >
>> > > I have a PDF file created using Latex. I am trying to read and print > > 
>> > > all
>> > > letters in that file using PDFBox, but when doing this all spaces in
>> > > that
>> > > file are ignored. Here is the code I am using:
>> > > PDPage page = (PDPage)allPages.get( 0 );
>> > > PDStream contents = page.getContents();
>> > > if ( contents != null ) {
>> > > PDFTextStripperProcessor pdfTextStripperProcessor = new
>> > > PDFTextStripperProcessor();
>> > > pdfTextStripperProcessor.processStream( page, > > 
>> > > page.findResources(),
>> > > contents.getStream() );
>> > > }
>> > >
>> > > public class PDFTextStripperProcessor extends PDFTextStripper {
>> > > @Override
>> > > public void processTextPosition( TextPosition text )  {
>> > > System.out.println( text.getCharacter() );
>> > > }
>> > > }
>> > >
>> > > And you can check a one page file sample here to test it:
>> > >
>> > > https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
>> > >
>> > > What is the cause of this issue please?
>> > >
>> > >
>> > > Best regards ,
>> > > Hesham
>> 
>> -
>> To unsubscribe, e-mail:

Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Frank van der Hulst

Spaces don't exist as characters in PDFs. To identify spaces, you have to
compare the X coordinates of adjacent characters against their widths.

On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  wrote:

> Hello ,
>
> I have a PDF file created using Latex. I am trying to read and print all
> letters in that file using PDFBox, but when doing this all spaces in that
> file are ignored. Here is the code I am using:
> PDPage page = (PDPage)allPages.get( 0 );
> PDStream contents = page.getContents();
> if ( contents != null ) {
> PDFTextStripperProcessor pdfTextStripperProcessor = new
> PDFTextStripperProcessor();
> pdfTextStripperProcessor.processStream( page, page.findResources(),
> contents.getStream() );
> }
>
> public class PDFTextStripperProcessor extends PDFTextStripper {
> @Override
> public void processTextPosition( TextPosition text )  {
> System.out.println( text.getCharacter() );
> }
> }
>
> And you can check a one page file sample here to test it:
>
> https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
>
> What is the cause of this issue please?
>
>
> Best regards ,
> Hesham

Spaces are ignored when reading a PDF file

2016-03-19 Thread Hesham G.

Hello ,

I have a PDF file created using Latex. I am trying to read and print all 
letters in that file using PDFBox, but when doing this all spaces in that file 
are ignored. Here is the code I am using:
PDPage page = (PDPage)allPages.get( 0 );
PDStream contents = page.getContents();
if ( contents != null ) {
PDFTextStripperProcessor pdfTextStripperProcessor = new 
PDFTextStripperProcessor();
pdfTextStripperProcessor.processStream( page, page.findResources(), 
contents.getStream() );
}

public class PDFTextStripperProcessor extends PDFTextStripper {
@Override
public void processTextPosition( TextPosition text )  {
System.out.println( text.getCharacter() );
}
}

And you can check a one page file sample here to test it:
https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf

What is the cause of this issue please?


Best regards ,
Hesham

Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Hesham G.

Clovis,

Thanks a lot :)

I will have to follow this solution if there is no alternative. The problem 
is that if I am extracting text of 500 or 600 pages PDF, that will consume 
much additional memory and time. In addition I guess it's only a special 
case for latex books only.

Best regards ,
Hesham

Included message :

just an idea from whom is not fluent in pdfbox nor PDF.
if you just want to know there is a space in between the letters and not
the amount of spaces, you can use your code to get character details and
then use extractText to get the words.

2016-03-17 7:20 GMT-03:00 Hesham G. :

Andreas,

That is very helpful.

I can get the x location of each character using TextPosition.getX(), ex:
W: 102.88399
i: 114.18165
t: 117.660614
h: 121.55801
d: 133.09477
u: 140.3994
e: 147.60838

So to detect the space between the 2 words "With" & "due" should I make
subtraction calculations between X of the last letter(h) and the X of the
first letter (d) and if the number is large than normal then this is a
space? I think this way might be risky in the detection, or what?

Best regards ,
Hesham

Included message :

Hi,

Frank van der Hulst  hat am 17. März 2016 um

08:34
geschrieben:

Spaces don't exist as characters in PDFs. To identify spaces, you have to
compare the X coordinates of adjacent characters against their widths.

That's not correct, spaces exist but in most cases pdf engines omit them
and
replace spaces by a splitted text with an appropriate positioning.

BTW, latex uses the same strategy. Here is a excerpt from your pdf:

  [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383
(Article)
-384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has)
-384
(the) -383 (right) ] TJ

The text is in between the braces and the numbers are used for horizontal
positioning.

BR
Andreas

On Thu, Mar 17, 2016 at 7:12 PM, Hesham G. 
wrote:

> Hello ,
>
> I have a PDF file created using Latex. I am trying to read and print 
> all

> letters in that file using PDFBox, but when doing this all spaces in >
that
> file are ignored. Here is the code I am using:
> PDPage page = (PDPage)allPages.get( 0 );
> PDStream contents = page.getContents();
> if ( contents != null ) {
> PDFTextStripperProcessor pdfTextStripperProcessor = new
> PDFTextStripperProcessor();
> pdfTextStripperProcessor.processStream( page, page.findResources(),
> contents.getStream() );
> }
>
> public class PDFTextStripperProcessor extends PDFTextStripper {
> @Override
> public void processTextPosition( TextPosition text )  {
> System.out.println( text.getCharacter() );
> }
> }
>
> And you can check a one page file sample here to test it:
>
>
https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
>
> What is the cause of this issue please?
>
>
> Best regards ,
> Hesham

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Re: Spaces are ignored when reading a PDF file

2016-03-19 Thread Tilman Hausherr


Am 17.03.2016 um 07:12 schrieb Hesham G.:

Hello ,

I have a PDF file created using Latex. I am trying to read and print all 
letters in that file using PDFBox, but when doing this all spaces in that file 
are ignored.


Here's what I get with ExtractText (your code is unusual), this 
looks excellent to me:


article titles c©by Michael O’Kane are not part of the law mu7ami.com
Article [220] Right to Regulate
With due regard to Article (219), the competent authority has the right
of monitoring the companies with regard to application of the provisions
set forth in the law and the company’s articles of association and bylaw
including the authority to inspect the company and check its account and
ask for data from the board of directors or the company managers through
a representative or more of its personnel or experts it chooses for this 
pur-

pose.
Article [221] Access to Records
All the company officials shall acquaint the Ministry representatives and
the Authority, fi the company is listed in the financial market or 
seeking to
be listed, with regard to the works stated in Article (220), all that 
they ask

of company books and records and documents and provide them with all
related information or clarification.
94 version 0.2 provided by mu7ami.com


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Re: Spaces are ignored when reading a PDF file

2016-03-18 Thread Hesham G.


Tilman,

I am using this code to extract the text from the pdf because I need font 
information about the extracted characters like determining the font name 
used. Using the normal extraction code will not work in my case.



Best regards ,
Hesham


Included message :

Am 17.03.2016 um 07:12 schrieb Hesham G.:

Hello ,

I have a PDF file created using Latex. I am trying to read and print all 
letters in that file using PDFBox, but when doing this all spaces in that 
file are ignored.


Here's what I get with ExtractText (your code is unusual), this
looks excellent to me:

article titles c©by Michael O’Kane are not part of the law mu7ami.com
Article [220] Right to Regulate
With due regard to Article (219), the competent authority has the right
of monitoring the companies with regard to application of the provisions
set forth in the law and the company’s articles of association and bylaw
including the authority to inspect the company and check its account and
ask for data from the board of directors or the company managers through
a representative or more of its personnel or experts it chooses for this
pur-
pose.
Article [221] Access to Records
All the company officials shall acquaint the Ministry representatives and
the Authority, fi the company is listed in the financial market or
seeking to
be listed, with regard to the works stated in Article (220), all that
they ask
of company books and records and documents and provide them with all
related information or clarification.
94 version 0.2 provided by mu7ami.com


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Re: Spaces are ignored when reading a PDF file

2016-03-18 Thread Hesham G.

John ,

I have checked the PrintTextLocations.java example. I have tested using this 
code for the "With due" term in my book sample, using this code:
System.out.println( "String[" + text.getCharacter() + ": " + text.getXDirAdj() 
+ "," +
text.getYDirAdj() + " fs=" + text.getFontSize() 
+ " xscale=" +
text.getXScale() + " height=" + 
text.getHeightDir() + " space=" +
text.getWidthOfSpace() + " width=" + 
text.getWidthDirAdj() + "]" );
And here are the results:
String[W: 102.88399,169.591 fs=11.9552 xscale=11.9552 height=7.328538 
space=2.9888 width=11.9552]
String[i: 114.18165,169.591 fs=11.9552 xscale=11.9552 height=7.328538 
space=2.9888 width=3.4789658]
String[t: 117.660614,169.591 fs=11.9552 xscale=11.9552 height=7.328538 
space=2.9888 width=3.8973923]
String[h: 121.55801,169.591 fs=11.9552 xscale=11.9552 height=7.328538 
space=2.9888 width=6.957924]
String[d: 133.09477,169.591 fs=11.9552 xscale=11.9552 height=7.328538 
space=2.9888 width=7.3046265]
String[u: 140.3994,169.591 fs=11.9552 xscale=11.9552 height=7.328538 
space=2.9888 width=7.2089844]
String[e: 147.60838,169.591 fs=11.9552 xscale=11.9552 height=7.328538 
space=2.9888 width=5.7265472]

So which method do you mean? .. The getXDirAdj() ?


Best regards ,
Hesham


Included message :

I’m rather confused by this thread, inferring spaces is one of the the main 
features of PDFTextStripper. I’m not sure why anyone is suggesting to process 
the text manually - there’s no need to do that. We do that already!

Looking at the original code the problem is right here:

> public class PDFTextStripperProcessor extends PDFTextStripper {
>@Override
>public void processTextPosition( TextPosition text )  {
>System.out.println( text.getCharacter() );
>}
> }

The processTextPosition method is used to pass an unprocessed TextPosition *in* 
to PDFTextStripper, but this override prevents that from happening, and is just 
printing the unprocessed token before PDFTextStripper has had a chance to do 
its job, such as inferring the missing spaces.

You should follow our PrintTextLocations.java example which shows you how to 
get the processed TextPositions from PDFTextStripper. It’s really easy to do.

— John

> On 17 Mar 2016, at 04:44, Hesham G.  wrote:
> 
> Andreas,
> 
> You're absolutely right. I am testing it now, but it seems very complicated. 
> I hope there might be another easier solution.
> 
> 
> Best regards ,
> Hesham
> 
> 
> Included message :
> 
>> "Hesham G."  hat am 17. März 2016 um 11:20
>> geschrieben:
>> 
>> 
>> Andreas,
>> 
>> That is very helpful.
>> 
>> I can get the x location of each character using TextPosition.getX(), ex:
>> W: 102.88399
>> i: 114.18165
>> t: 117.660614
>> h: 121.55801
>> d: 133.09477
>> u: 140.3994
>> e: 147.60838
>> 
>> So to detect the space between the 2 words "With" & "due" should I make
>> subtraction calculations between X of the last letter(h) and the X of the
>> first letter (d) and if the number is large than normal then this is a
>> space? I think this way might be risky in the detection, or what?
> That's the short story. To decide what is normal could be quite tricky. You 
> have
> to take the following facts into account:
> 
> - different fonts have different widths (important if the font before the 
> space
> isn't the same than the font after the space)
> - keep in mind that you have to take a scaling and sometimes a rotation into
> account
> - the "space" between characters may vary if the text is jusitified
> 
> There are certainly some other details which may be important as well, so that
> you end up with some more or less heuristic.
> 
> BR
> Andreas
> 
>> Best regards ,
>> Hesham
>> 
>> 
>> Included message :
>> 
>> Hi,
>> 
>> > Frank van der Hulst  hat am 17. März 2016 um
>> > 08:34
>> > geschrieben:
>> >
>> >
>> > Spaces don't exist as characters in PDFs. To identify spaces, you have > to
>> > compare the X coordinates of adjacent characters against their widths.
>> That's not correct, spaces exist but in most cases pdf engines omit them and
>> replace spaces by a splitted text with an appropriate positioning.
>> 
>> BTW, latex uses the same strategy. Here is a excerpt from your pdf:
>> 
>>   [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383
>> (Article)
>> -384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has) -384
>> (the) -383 (right) ] TJ
>> 
>> The text is in between the braces and the numbers are used for horizontal
>> positioning.
>> 
>> BR
>> Andreas
>> 
>> >
>> > On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  > 
>> > wrote:
>> >
>> > >

Re: Spaces are ignored when reading a PDF file

2016-03-18 Thread Andreas Lehmkühler

> "Hesham G."  hat am 17. März 2016 um 11:20
> geschrieben:
> 
> 
> Andreas,
> 
> That is very helpful.
> 
> I can get the x location of each character using TextPosition.getX(), ex:
> W: 102.88399
> i: 114.18165
> t: 117.660614
> h: 121.55801
> d: 133.09477
> u: 140.3994
> e: 147.60838
> 
> So to detect the space between the 2 words "With" & "due" should I make 
> subtraction calculations between X of the last letter(h) and the X of the 
> first letter (d) and if the number is large than normal then this is a 
> space? I think this way might be risky in the detection, or what?
That's the short story. To decide what is normal could be quite tricky. You have
to take the following facts into account:

- different fonts have different widths (important if the font before the space
isn't the same than the font after the space)
- keep in mind that you have to take a scaling and sometimes a rotation into
account
- the "space" between characters may vary if the text is jusitified

There are certainly some other details which may be important as well, so that
you end up with some more or less heuristic. 

BR
Andreas

> Best regards ,
> Hesham
> 
> 
> Included message :
> 
> Hi,
> 
> > Frank van der Hulst  hat am 17. März 2016 um 
> > 08:34
> > geschrieben:
> >
> >
> > Spaces don't exist as characters in PDFs. To identify spaces, you have to
> > compare the X coordinates of adjacent characters against their widths.
> That's not correct, spaces exist but in most cases pdf engines omit them and
> replace spaces by a splitted text with an appropriate positioning.
> 
> BTW, latex uses the same strategy. Here is a excerpt from your pdf:
> 
>[ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383 
> (Article)
> -384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has) -384
> (the) -383 (right) ] TJ
> 
> The text is in between the braces and the numbers are used for horizontal
> positioning.
> 
> BR
> Andreas
> 
> >
> > On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  wrote:
> >
> > > Hello ,
> > >
> > > I have a PDF file created using Latex. I am trying to read and print all
> > > letters in that file using PDFBox, but when doing this all spaces in 
> > > that
> > > file are ignored. Here is the code I am using:
> > > PDPage page = (PDPage)allPages.get( 0 );
> > > PDStream contents = page.getContents();
> > > if ( contents != null ) {
> > > PDFTextStripperProcessor pdfTextStripperProcessor = new
> > > PDFTextStripperProcessor();
> > > pdfTextStripperProcessor.processStream( page, page.findResources(),
> > > contents.getStream() );
> > > }
> > >
> > > public class PDFTextStripperProcessor extends PDFTextStripper {
> > > @Override
> > > public void processTextPosition( TextPosition text )  {
> > > System.out.println( text.getCharacter() );
> > > }
> > > }
> > >
> > > And you can check a one page file sample here to test it:
> > >
> > > https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
> > >
> > > What is the cause of this issue please?
> > >
> > >
> > > Best regards ,
> > > Hesham
> 
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Re: Spaces are ignored when reading a PDF file

2016-03-18 Thread John Hewson

I’m rather confused by this thread, inferring spaces is one of the the main 
features of PDFTextStripper. I’m not sure why anyone is suggesting to process 
the text manually - there’s no need to do that. We do that already!

Looking at the original code the problem is right here:

> public class PDFTextStripperProcessor extends PDFTextStripper {
>@Override
>public void processTextPosition( TextPosition text )  {
>System.out.println( text.getCharacter() );
>}
> }

The processTextPosition method is used to pass an unprocessed TextPosition *in* 
to PDFTextStripper, but this override prevents that from happening, and is just 
printing the unprocessed token before PDFTextStripper has had a chance to do 
its job, such as inferring the missing spaces.

You should follow our PrintTextLocations.java example which shows you how to 
get the processed TextPositions from PDFTextStripper. It’s really easy to do.

— John

> On 17 Mar 2016, at 04:44, Hesham G.  wrote:
> 
> Andreas,
> 
> You're absolutely right. I am testing it now, but it seems very complicated. 
> I hope there might be another easier solution.
> 
> 
> Best regards ,
> Hesham
> 
> 
> Included message :
> 
>> "Hesham G."  hat am 17. März 2016 um 11:20
>> geschrieben:
>> 
>> 
>> Andreas,
>> 
>> That is very helpful.
>> 
>> I can get the x location of each character using TextPosition.getX(), ex:
>> W: 102.88399
>> i: 114.18165
>> t: 117.660614
>> h: 121.55801
>> d: 133.09477
>> u: 140.3994
>> e: 147.60838
>> 
>> So to detect the space between the 2 words "With" & "due" should I make
>> subtraction calculations between X of the last letter(h) and the X of the
>> first letter (d) and if the number is large than normal then this is a
>> space? I think this way might be risky in the detection, or what?
> That's the short story. To decide what is normal could be quite tricky. You 
> have
> to take the following facts into account:
> 
> - different fonts have different widths (important if the font before the 
> space
> isn't the same than the font after the space)
> - keep in mind that you have to take a scaling and sometimes a rotation into
> account
> - the "space" between characters may vary if the text is jusitified
> 
> There are certainly some other details which may be important as well, so that
> you end up with some more or less heuristic.
> 
> BR
> Andreas
> 
>> Best regards ,
>> Hesham
>> 
>> 
>> Included message :
>> 
>> Hi,
>> 
>> > Frank van der Hulst  hat am 17. März 2016 um
>> > 08:34
>> > geschrieben:
>> >
>> >
>> > Spaces don't exist as characters in PDFs. To identify spaces, you have > to
>> > compare the X coordinates of adjacent characters against their widths.
>> That's not correct, spaces exist but in most cases pdf engines omit them and
>> replace spaces by a splitted text with an appropriate positioning.
>> 
>> BTW, latex uses the same strategy. Here is a excerpt from your pdf:
>> 
>>   [ (W) 55 (ith) -383 (due) -384 (r) 18 (egar) 18 (d) -383 (to) -383
>> (Article)
>> -384 (\(219\),) -416 (the) -384 (competent) -383 (authority) -383 (has) -384
>> (the) -383 (right) ] TJ
>> 
>> The text is in between the braces and the numbers are used for horizontal
>> positioning.
>> 
>> BR
>> Andreas
>> 
>> >
>> > On Thu, Mar 17, 2016 at 7:12 PM, Hesham G.  > 
>> > wrote:
>> >
>> > > Hello ,
>> > >
>> > > I have a PDF file created using Latex. I am trying to read and print > > 
>> > > all
>> > > letters in that file using PDFBox, but when doing this all spaces in
>> > > that
>> > > file are ignored. Here is the code I am using:
>> > > PDPage page = (PDPage)allPages.get( 0 );
>> > > PDStream contents = page.getContents();
>> > > if ( contents != null ) {
>> > > PDFTextStripperProcessor pdfTextStripperProcessor = new
>> > > PDFTextStripperProcessor();
>> > > pdfTextStripperProcessor.processStream( page, > > 
>> > > page.findResources(),
>> > > contents.getStream() );
>> > > }
>> > >
>> > > public class PDFTextStripperProcessor extends PDFTextStripper {
>> > > @Override
>> > > public void processTextPosition( TextPosition text )  {
>> > > System.out.println( text.getCharacter() );
>> > > }
>> > > }
>> > >
>> > > And you can check a one page file sample here to test it:
>> > >
>> > > https://dl.dropboxusercontent.com/u/10111483/downloads/pdfbox/pdf_latex_spaces_ignored.pdf
>> > >
>> > > What is the cause of this issue please?
>> > >
>> > >
>> > > Best regards ,
>> > > Hesham
>> 
>> -
>> To unsubscribe, e-mail: users-unsubscr...@pdfbox.apache.org
>> For additional commands, e-mail: users-h...@pdfbox.apache.org
>> 
>> 
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>> To

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Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

Re: Spaces are ignored when reading a PDF file

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