Hi AG. I guess the attachment py_cb.7z was stripped. The statement below is correct, I am trying to register a Python function as the Callback (Confirmation) For a C++ function in the .dll. When I register the call-back with prod_bat_vol_read_request I should get a machine readable 'token' from send_serial_data.tx_data. I send this token to the battery tester to start it. When the test is done, my_conf_func should be triggered. The code is in line below.
Section 15.17.1.17 is in the 2.6/library docs see the URL in the comments below. I tried several different ways without success. Thanks for your advice. Pete #********************************************************************************* ''' bat_read_15_17_1_17 this program is attempting ot register a call back function the ProductionTest.dll using the techniques outlined in section 15.17.1.17 of the python docs https://docs.python.org/2.6/library/ctypes.html#module-ctypes ''' '''open and register SendSerialData this part looks like it's working ''' from ctypes import * pt_dll = pt_dll = cdll.LoadLibrary("c:/py_stuff/ProductionTest.dll") reg_send_serial_data = pt_dll.RegSendSerialData class SendSerialData_t(Structure): _fields_ = [("tx_data", c_void_p), ("size", c_uint8)] send_serial_data = SendSerialData_t() try: reg_send_serial_data(send_serial_data) except: print "reg_send_serial_data fail" print send_serial_data.tx_data print send_serial_data.size '''set up ProdBatVolRequest and register my_conf_func as the call back this is NOT working. ''' prod_bat_vol_read_request = pt_dll.ProdBatVolReadRequest #MY_FUNC = CFUNCTYPE(None, POINTER(c_uint16),POINTER(c_uint8)) #MY_FUNC = CFUNCTYPE(None, c_uint16,c_uint8) MY_FUNC = CFUNCTYPE(c_uint16,c_uint8) #MY_FUNC = WINFUNCTYPE(c_uint16,c_uint8) #MY_FUNC = WINFUNCTYPE(None, POINTER(c_uint16),POINTER(c_uint8)) def my_conf_func(bat_vol, status): print "my_conf_func", bat_vol, status #return 0 conf_func = MY_FUNC(my_conf_func) print "breakpoint" #prod_bat_vol_read_request(conf_func) #prod_bat_vol_read_request(my_conf_func) #prod_bat_vol_read_request(POINTER(my_conf_func)) #************************************************************************** > -----Original Message----- > From: Tutor [mailto:tutor-bounces+pete.wilson=atmel....@python.org] On > Behalf Of Alan Gauld > Sent: Thursday, October 16, 2014 5:24 PM > To: tutor@python.org > Subject: Re: [Tutor] Registering callbacks and .DLL > > On 17/10/14 00:35, Wilson, Pete wrote: > > I'm having problems registering a call-back with a .DLL. Maybe > someone > > has some advice on registering call-backs from .dlls. > > > > I'm using Windows 7 and Python 2.6 (32-bits). The .DLL was written in > > C++ is working with C++ apps calling it. > > OK As I understand it, You are trying to register a Python function as > a call back on a C++ function in a DLL is that correct? > > Do you have any code? I don't see any attachment. Many lists/servers > strip out binary attachments as potential viruses so it may not have > made it through. Code is best included inline as text provided its not > too long, or alternatively, in a pastebin. > > > I tried the methods in section 15.17.1.17 with the qsort() and > > CFUNCTYPE, but it is not working. My code and the .dll are attached. > > Section 15.17.1.17 of what? Not the tutorial, not the library reference > and not the language reference. So what? > > This question may be a tad too complex for the tutor list which is > targeted to those learning Python, you probably want the main list for > this. But you are going to have to provide some code and a more > detailed description of what you are trying to do. > > -- > Alan G > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > http://www.flickr.com/photos/alangauldphotos > > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
