[Zope] Passing Parameters to External Methods
J Cameron Cooper
zope-l at jcameroncooper.com
Wed Nov 16 12:26:10 EST 2005
Asad Habib wrote:
> Hi Cameron. You are right but the self parameter is implicitly passed.
It is implicitly passed, but must be explicitly defined::
def createHtmlToPdf(self, in_htmlFile, in_domain, in_pdfFile):
return html2pdf(in_htmlFile, in_domain, in_pdfFile)
When you say::
context.createHtmlToPdf(in_htmlFile, in_domain, in_pdfFile)
Python ends up calling this method/function something like::
createHtmlToPdf(context, in_htmlFile, in_domain, in_pdfFile)
Your message signature must agree.
--jcc
> On Wed, 16 Nov 2005, J Cameron Cooper wrote:
>
>> Asad Habib wrote:
>>
>>> Hello. I am trying to use the Python version of the PHP script
>>> written by Jason Rust called 'HTML_ToPDF.php'. I have represented
>>> this script using an External Method since it uses functions, such as
>>> open, which cannot be used in Zope Python scripts for security
>>> reasons. The python code for the script consists of a class
>>> definition and so I have had to create a python function which
>>> instantiates an object of this class. However, I am having toruble
>>> passing parameters to this function which are needed by the class
>>> constructor to instantiate an object of this class. Can parameters be
>>> passed to external methods? Whenever I try to pass parameters to
>>> function 'createHtmlToPdf', Zope returns an error stating that no
>>> such function exists. Other on the hand, if I pass no parameters this
>>> call is successful but the init function fails complaining that three
>>> parameters are expected. I have provided a snippet of my code below.
>>> Any help would be greatly appreciated. Thanks.
>>
>>
>>> def createHtmlToPdf(in_htmlFile, in_domain, in_pdfFile):
>>> return html2pdf(in_htmlFile, in_domain, in_pdfFile)
>>
>>
>> Functions in external methods generally start with the 'self'
>> parameter. Your description of the error messages doesn't entirely
>> support my supposition, but you could try it.
>>
>> --jcc
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>
>
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