Re: Python for .NET.
All,
I have created a Clr example which instantiates and manipulates objects of type
System.String.
When I try to have it access the HelloWorld-esque object that I have written in
VB.net python throws an error on my import statement.
In the docs on "Python for .NET" there's no discussion on what form the .NET
code must be in to be reachable, in terms of namespaces, modules and classes.
Here's my code. I've tried encapsulating my class in Namespace and Module
wrappers no avail. Perhaps the lack of a PublicKeyToken is an ssue.
Any help you can provide would be greatly appreciated.
Feedback...
I thought the process was fairly simple.
0. The inclusion of python.exe in the .zip merits annotating as optional.
1. The readme should probably discuss the need to
sys.path.append('c:\Python25\Lib\site-packages\Clr').
2. I thought the filename, Python.Runtime.dll, was too generic. Is it within
your abilities to name it more specifically, such as PythonForNet.Runtime.dll
3. There's no reference section for the methods of clr. (ex: what is the
parameter to and usage of ListAssemblies?)
Regards,
Scot Kelly.
ps: a little revolution now and then is a good thing
python code:
import sys
sys.path.append('c:\Python25\Lib\site-packages\Clr') #Contains two files:
clr.pyd and Python.Runtime.dll.
import clr
def CallMicrosoftStringClass():
#clr.AddReference("System")
#from System import String as DotNetString
#print clr.ListAssemblies()
print 'Welcome to CallMicrosoftStringClass.'
a = DotNetString('SomeTyping')
print 'a is a instance of ' + a.__class__.__name__
print 'a', a
b = DotNetString(a.PadRight(15, 'x'))
print 'b', b
c = DotNetString(b.Insert(2,'abc'))
print 'c', c
d = c.ToUpper() #note: not calling construtor of DotNetString here.
print 'd', d
print 'd is a instance of ' + d.__class__.__name__
print 'Leaving CallMicrosoftStringClass.'
def CallObjectTwo():
#Import System
clr.AddReference("CallbackExample")
print '1111.a'
print clr.FindAssembly("CallbackExample")
print '1111.b'
#print dir(clr)
for e in clr.ListAssemblies(0):
print e
print '1111.c'
for e in clr.ListAssemblies(1):
print e
print '1111.d'
#from Namspacexyz import ObjectTwo as ObjDos
#import CallbackExample
import ObjectTwo
print '2222'
print 'Welcome to CallObjectTwo.'
#a = ObjectDos('SomeTyping')
#print 'a is a instance of ' + a.__class__.__name__
print 'Leaving CallObjectTwo.'
print ' '
print ' '
print ' '
print ' '
print ' '
print ' '
print ' '
#for element in sys.path:
# print element
print 'Welcome to Scots_ClrExample '*3
CallObjectTwo()
print 'Finished with Scots_ClrExample '*3
VB.net code:
Imports System
'Imports System.Collections.ArrayList
'Imports System.Collections
'Imports System.Threading
'Imports System.Runtime.InteropServices
'Imports System.Data.Sql
'Imports System.Data.SqlTypes
'Imports Microsoft.SqlServer.Server
''Imports System.Win32Native
'How to compile:
' cd "c:\Program Files\Microsoft Sql Server"
' path=%path%;%SystemRoot%\Microsoft.NET\Framework\v2.0.50727
' vbc /target:library "CallbackExample.vb" | more
Public Namespace NSPC
'Public Module CallbackExample
'Demo callback functionality
Public Class ObjectTwo
Public Shared Function HelloWorld() as string
return "Hello World from ObjectTwo !!"
End Function
Public Shared Function TestCallBack(obj As Object) As string
Dim sResult as string
sResult = "Hello"
obj.CallbackFunc237(sResult)
sResult = "Goodbye"
return sResult 'new SqlChars(CSTR(sResult))
End Function
End Class
'End Module
End Namespace
PASSPORT CAPITAL
30 Hotaling Place, Suite 300
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www.passportcapital.com<http://www.passportcapital.com/>
Scot Kelly
Tel 415-525-8910
Fax 415-321-4620
[email protected]
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