[reportlab-users] ValueError: redefining named object

[jo]

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'
----------------------------------------------------------------------------------------------------------------------------------------------------------------

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.save()

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


Robin Becker ha scritto:

> jo wrote:

>> Robin Becker ha scritto:

>>> jo wrote:

>>>>

>>>> I see the line that cause this error is this one:

>>>> self.ss['tx'].setFont('OCR', 10)

>>>>

>>>> seems reportlab can performs setFont() only the first time but this 

>>>> happen

>>>> only when the font is defined by user.

>>>> I wonder if there's a workaround to avoid this error.

>>>>

>>>> def display(self):

>>>> self.ss['tx'] = self.ss['cnvs'].beginText()

>>>> self.ss['eli'] = self.ss['cnvs'].beginPath()

>>>> self.ss['tx'].setHorizScale(100)

>>>> self.ss['tx'].setTextOrigin(0,0)

>>>> self.ss['tx'].moveCursor(

>>>> (self.ss['borderx'] + (self.ss['pxriga'] * 31)),

>>>> (self.ss['bordery'] + (self.ss['pxriga'] * 1))

>>>> )

>>>> self.ss['tx'].textOut("printing...")

>>>> self.ss['cnvs'].drawText(self.ss['tx'])

>>>> self.ss['cnvs'].showPage()

>>>> self.ss['cnvs'].save()

>>>>

>>>> jo

>>> .......

>>> try:

>>> self.ss['tx'].setFont('OCR', 10)

>>> except:

>>> pass

>>>

>>> or better

>>>

>>> def startup(self):

>>> # do things required only once

>>> self.ss['tx'].setFont('OCR', 10)

>>>

>> Thank you, Robin for your help.

>>

>> Your tip should be a solution only if I use the same font and the 

>> same size in whole document,

>> infortunately I have to use more than one font and more than one size 

>> in the entire document,

>> because reportlab uses the last font setting, I am not able to change 

>> font and size.

>>

>> if I use 'OCR', size 10 to print the 1st line and I need to change 

>> the size from 10 to 8 to print the 2nd line,

>> I can't do that.

> .......

> I'm probably being stupid, but have you registered these fonts before 

> attempting to use them. Looked more closely at your example and 

> your're actually using a textobject to do this output. That being said 

> you should be able to change the font back and forth as many times as 

> you want.

>

> This certainly works for me

>

> from reportlab.pdfgen import canvas

> from reportlab.pdfbase import pdfmetrics, ttfonts

> pdfmetrics.registerFont(ttfonts.TTFont("Rina", "rina.ttf"))

> canv = canvas.Canvas('out.pdf')

> 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(' cruel')

> t.setFont('Rina',8)

> t.setFillColor((0,0,1))

> t.textOut(' World!')

> canv.drawText(t)

> canv.showPage()

> canv.save()