 | | | Custom Objects and Classes for Scripting | Custom Objects and Classes for Scripting 2005-03-26 - By Brad Friedman
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Thats interesting. I'm guessing that JScript, being pretty much activex
native, probably doesn't need to explicitely wrap or export its
objects. Though I don't know. I'll need to try it out I guess. Thanks
for the info Bernard.
-brad
Bernard Lebel wrote:
> Brad Friedman wrote:
>
>> What I wonder with your example, is what would happen if you returned
>> an instance of your Ls class from a command, and then called that
>> command from say... vbscript. Would you be able to call
>> ls.HasAreaTransforms() from vbscript, (...)
>>
>> -brad
>
>
>
> That is actually a very good question, and the answer is yes, you can
> use Python classes with other langages. The same issue was brought up
> on a former sister mailing list, and here is what Jerry -the
> Softimage's Python MVP- Gamache had to say:
>
>
> """
>
> Hello Bernard,
>
> Python allows you to return a Python class as an ActiveX object, but
> extra work is needed:
>
> 1- Some attributes must be set at the class definition level to define
> which methods and attributes are exposed:
> _public_methods_ -> List of public functions
> _public_attrs_ -> List of public attributes (both read-only
> and read-write)
> _readonly_attrs_ -> List of read only attributes
>
> 2- The class must be wrapped before being returned:
> Use the win32com.server.util.wrap( ) function
>
> The following self installable plugin returns a Python object usable
> from jscript and vbscript:
>
> ###
> ### Python script begin
> ###
>
> # This class is going to be exported to VB and jscript
> class TestPython:
> # Declare list of exported functions:
> _public_methods_ = ['GetAnswer']
> # Declare list of exported attributes
> _public_attrs_ = ['exclamation', 'answer']
> # Declare list of exported read-only attributes:
> _readonly_attrs_ = ['answer']
>
> # Class init:
> def __init__(self):
> # Initialize exported attributes:
> self.exclamation = 1
> self.answer = 42
> # Perfectly legal to have other non exported attributes
>
> # Exported function
> def GetAnswer(self, question):
> return "The answer to " + str(question) + " is " +
> str(self.answer) + "!"*self.exclamation
>
> # Perfectly legal to have other non exported functions.
>
> true = 1
>
> # Traditionnal Plugin installation:
> def XSILoadPlugin( in_reg ):
> in_reg.Author = "Command Wizard User"
> in_reg.Name = "TestPython Plug-in"
> in_reg.Major = 1
> in_reg.Minor = 0
> in_reg.RegisterCommand( "TestPython","TestPython" )
> return true
>
> def TestPython_Init( io_Context ):
> oCmd = io_Context.Source
> Application.LogMessage( "TestPython_Init called" )
> oCmd.Description = ""
> oCmd.ToolTip = ""
> oCmd.ReturnValue = true
> return true
>
> def TestPython_Execute( ):
> Application.LogMessage( "TestPython_Execute called" )
> oClass = TestPython()
> import win32com.server
> # Class MUST be wrapped before being returned:
> return win32com.server.util.wrap(oClass)
>
> ###
> ### Python script end
> ###
>
> This test vb script works just fine using the Python object:
>
> '''
> ''' VB script begin
> '''
> set a = TestPython()
> 'INFO : TestPython_Execute called
> LogMessage a.GetAnswer("life, the universe, everything")
> 'INFO : The answer to life, the universe, everything is 42!
> a.exclamation = 10
> LogMessage a.GetAnswer("life, the universe, everything")
> 'INFO : The answer to life, the universe, everything is 42!!!!!!!!!!
> '''
> ''' VB script end
> '''
>
> And the killer is that a function called "unwrap" exists in
> win32com.server, allowing you to get back the pure Python object that
> was wrapped. This could be useful in some scenarios...
>
> """
>
> Note that the issue was again brought up recently on another sister
> mailing list, and Kim promised to post something about that on
> CG-Soup.... we're still waiting Kim ;-)
>
>
>
> Bernard
>
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