[Zope] Passing Parameters to External Methods

[J Cameron Cooper]

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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