Call CAPL function from Python

Question

I'm working on CANalyzer and I can't find how to call a CAPL function wich contains a parameter. If I put num in functions_call.Call(num) it doesn't work.

def call(num):
    print 'calling from CAN'
    x=int(num) 
    functions_call.Call()
    return 1

Answer 1

I ran into a similar problem a while back and some Googling led me to the following application note by Vector:

http://vector.com/portal/medien/cmc/application_notes/AN-AND-1-117_CANoe_CANalyzer_as_a_COM_Server.pdf

...checkout section "2.7 Calling CAPL Functions".

To sum it up, make sure to declare your CAPL function's parameters as "long", .e.g: the following seemed to work for me:

void function1(long l)
{
   write("function1() called with %d!", l);
}

For the sake of completion, this is how my python code (for the example above) looks like:

from win32com import client
import pythoncom
import time

function1 = None
canoe_app = None
is_running = False

class EventHandler:

    def OnInit(self):
        global canoe_app
        global function1

        function1 = canoe_app.CAPL.GetFunction('function1')

    def OnStart(self):
        global is_running
        is_running = True

canoe_app = client.Dispatch('CANoe.Application')
measurement = canoe_app.Measurement
measurement_events = client.WithEvents(measurement, EventHandler)
measurement.Start()


# The following loop takes care of any pending events and, once, the Measurement
# starts, it will call the CAPL function "function1" 10 times and then exit!
count = 0
while count < 10:
    if (is_running):
        function1.Call(count)
        count += 1

    pythoncom.PumpWaitingMessages()
    time.sleep(1)

Answer 2

If I pass char as argument in function1.Call(some char variable) in python, it throws error as

File "C:\Python27\lib\site-packages\win32com\gen_py\4CB02FC0-4F33-11D3-854D-00105A3E017Bx0x1x31.py", line 1668, in Call , p7, p8, p9, p10) File "C:\Python27\lib\site-packages\win32com\client__init__.py", line 467, in ApplyTypes self.oleobj.InvokeTypes(dispid, 0, wFlags, retType, argTypes, *args), pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None, None, 0, -2147352571), 10)

Python:

var = 'abc'

count = 0

while count < 10:

    if (is_running):

        function1.Call(var)

        count += 1

CAPL:

void function1(char var1[])

{

    //Code

}