[reportlab-users] ValueError: redefining named object

[Robin Becker]

jo wrote:

> My propose is to print more than one page in the same document.

> Infact the error is not raised if my pdf is only one page.

> Probably there's something that I am doing wrong. :-\

> 

> I changed a little your sample to having it printing two pages.

> It prints the first page without errors,

> but the second time...

> ValueError: redefining named object: 

> 'toUnicodeCMap:SUBSET+OCRB10PitchBT-Regular+0'


I'm afraid your email has messed up all indentation so I cannot tell where the 
def page actually ends, but if the page function contains a canv.save then that 
is being done twice, on the other hand if it's outside the function then the 
canv.save will cause an error because canv is not defined. However, putting the 
canv.save in the right place make this work just fine. The canv.save() finishes 
the canvas off and writes stuff to disk etc etc. I'm not surprised you get 
errors writing to a defunct canvas. Probably all accesses should be made illegal 
after that, but that's quite difficult and probably not worth the effort; 
besides a small number of experts might want to inspect the canvas object even 
after its 'gone away' or 'turned its toes up' or 'taken out Norwegian citizen 
ship' :)

##################
from reportlab.pdfgen import canvas
from reportlab.pdfbase import pdfmetrics, ttfonts
pdfmetrics.registerFont(ttfonts.TTFont("Rina", "rina.ttf"))
def page(line1,line2):
	t=canv.beginText(72,72)
	t.setFont('Rina',10)
	t.setFillColor((1,0,0))
	t.textOut('hello')
	t.setFont('Rina',12)
	t.setFillColor((0,1,0))
	t.textOut(line1)
	t.setFont('Rina',8)
	t.setFillColor((0,0,1))
	t.textOut(line2)
	canv.drawText(t)
	canv.showPage()

canv = canvas.Canvas('out.pdf')
page(line1='cruel',line2='world') #page 1
page(line1='wonderful',line2='world') #page 2
canv.save()
##################

............
-- 
Robin Becker