On Tue, 2010-03-09 at 02:12 +0100, John Wu wrote:
> Thanks for response.
>
> Can you give me an example for this? Can prawn edit existing pdf file?
>
>
> Craig White wrote:
> > On Tue, 2010-03-09 at 01:29 +0100, John Wu wrote:
> >> Hi,
> >>
> >> I am new to rails. I need to edit an existing pdf file and fill in some
> >> data and send it to browser, how to implement this? Is there an example
> >> online I can look at it?
> > ----
> > I do this using pdftk and using rails to output the fdf data file and
> > then using pdftk to merge the data to the PDF template.
> >
> > You might be able to use prawn to do that.
----
don't know about prawn - you might want to check out the project page.
as for an example, not sure how helpful this will actually be but...
def guardian_fdf_form
@client = Client.find(params[:id])
@fdfobj = Fdf.new
@fdfobj.url = "http://SOME_WEB_SERVER/GuardianAgreement.pdf";
myfdf = @fdfobj.create_header
myfdf += @fdfobj.add_data({"guardian",@client.clwholename})
myfdf += @fdfobj.specify_pdf(@fdfobj.url)
myfdf += @fdfobj.create_footer
send_data(myfdf, {:type => "application/vnd.fdf", :stream =>
false, :filename => "Guardian_Agreement_out.fdf"})
end
and I have an FDF model (fdf.rb) that looks like this...(watch for line
breaks)
# Provides basic for generating FDF type data files (related to PDF)
class Fdf < ActiveRecord::BaseWithoutTable
attr_accessor :data, :url
def add_data(fdfdata)
return format_data(fdfdata)
end
def hide_data(field)
return self.data = self.data.gsub(/(<<\/T\(#{field}\)\/V\()(\w*
\)>>\s)/, '')
end
def create_header
return "%FDF-1.2\x0d%\xe2\xe3\xcf\xd3\x0d\x0a 1 0 obj\x0d<< \x0d/FDF
<< /Fields [ "
end
def create_footer
return "] \x0d >> \x0d >> \x0dendobj\x0d trailer\x0d<<\x0d/Root 1 0
R \x0d\x0d>>\x0d %%EOF\x0d\x0a"
end
def specify_pdf(pdf_url)
return "] \x0d /F (" << pdf_url << ") /ID [ <" <<
Digest::SHA1.hexdigest(Time.now.to_i.to_s) << ">"
end
def format_data(fdfdata)
data = ''
fdfdata.each { |key,value|
if value.class == Hash
value.each { |sub_key,sub_value|
data += '<</T(' + key + '_' + sub_key + ')'
data += '/V(' + escape_data(sub_value) + ')>> '
}
else
data += '<</T(' + key + ')/V(' + escape_data(value) + ')>> '
end
}
return data
end
def escape_data(fdfdata)
fdfdata = fdfdata.to_s.strip.gsub(/[\(]/, '\\(')
fdfdata = fdfdata.to_s.gsub(/[\)]/, '\\)')
return fdfdata
end
end
Craig
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