How can I dial GPRS/EDGE in Win CE?

[Brontes]

Hello all.

I am developing application in python on Windows CE which needs connection to the internet (via GPRS/EDGE). When I turn on the device, the internet connection is not active. It becomes active if I open internet explorer.

I would like to activate connection in my application. I'm trying to do this with RasDial function over ctypes library, but I can't get it to work. Is this the right way or I should do something else?

Below is my current code. The ResDial function keeps returning error 87 – Invalid parameter. I don't know anymore what is wrong with it.

I would really appreciate any kind of help. Thanks in advance.

#encoding: utf-8
 
import ppygui as gui
from ctypes import *
import os
 
class MainFrame(gui.CeFrame):
    def __init__(self, parent = None):
        gui.CeFrame.__init__(self, title=u"Zgodovina dokumentov", menu="Menu")
 
        DWORD = c_ulong
        TCHAR = c_wchar
        ULONG_PTR = c_ulong 
 
        class RASDIALPARAMS(Structure):
             _fields_ = [("dwSize", DWORD),
                         ("szEntryName", TCHAR*21),
                         ("szPhoneNumber", TCHAR*129),
                         ("szCallbackNumber", TCHAR*49),
                         ("szUserName", TCHAR*257),
                         ("szPassword", TCHAR*257),
                         ("szDomain", TCHAR*16),
                         ]
 
        try:
            param = RASDIALPARAMS()
            param.dwSize = 1462 # also tried 1464 and sizeof(RASDIALPARAMS()). Makes no difference.
            param.szEntryName = u"My Connection"
            param.szPhoneNumber = u"0"
            param.szCallbackNumber = u"0"
            param.szUserName = u"0"
            param.szPassword = u"0"
            param.szDomain = u"0"
 
            iNasConn = c_ulong(0)
            ras = windll.coredll.RasDial(None, None, param, c_ulong(0xFFFFFFFF), c_voidp(self._w32_hWnd), byref(iNasConn))
            print ras, repr(iNasConn) #this prints 87 c_ulong(0L)
        except Exception, e:
            print "Error"
            print e
 
if __name__ == '__main__':
   app = gui.Application(MainFrame(None))
   # create an application bound to our main frame instance
   app.run()
   #launch the app !