search letter occurance a document

[hammingcode]

Hi guys

I am trying to  count the letter occurance in a document, say a PDF or word.  Say A occurance in the document.  And also count the amount of letters in a document   in the document and output the letter i counted to a new documment.

Best Regards

Hammingcode

[RavensFan]

What have you tried?

First you need to get the document into LabVIEW as a string.

Then I would consider converting the string to a U8 array.  Then I would do a histogram on that.  You would have the number of each byte value that exists in the document which would be the ASCII value of a particular character.

[hammingcode]

I thoguht about that, but Labview string has limit size, if the document size is quite big. it is not possible to convert all letters into string

[johnsold]

If the dcoument is so large that all its text cannot be contained by one string, then you will need to read it in sections and add the character counts.

Lynn

[TCPlomp]

Are you serious about the 'string length' limit? A string is sizable upto U32, or 4 GB, so probably more than the amount of memory your OS is giving to any process.

Ton 

[hammingcode]

You mean i need copy the contains of document and paste it in the Labview string?   Is there any subVi can read the contain of document to a string?

[RavensFan]

It depends.  What is the source?  Is it .pdf for Word, the answer will be different for each.

I don't know about the .pdf.  For Word, you could use ActiveX functions to access the file and read the data.

[Pete.Dunc]

- How have you been getting on with this?  Do you have any other details?

I'd be interested in seeing how you could extract the text from a PDF file.  I have no doubt that it could be done, however you might need a dig a little through the construction of the PDF file.  Most of the tools which are available are for generation - for example the Report Generation Toolkit for MS applications or PDF toolkits from multiple 3rd party sources.

[Pete.Dunc]

If it is a PDF - this looks to be a useful document as a starting point.