[reportlab-users] ValueError: redefining named object

[jo]

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.


jo