[Freeswitch-dev] FW: Visual Studio 2008 Pro SP1: switch_loadable_module.c:871 Error Loading module .... **dll sym error [127l]

Alex To tonhudung at gmail.com
Wed Nov 4 05:57:23 PST 2009 

Thanks Mike for the hint. I figured it out. To avoid this error, I need to
wrap the part where we define the SWITCH_MODULE_..._FUNCTION inside
SWITCH_BEGIN_EXTERN_C AND SWITCH_END_EXTERN_C.

It is now loaded fine.

Regards

Alex To


-----Original Message-----
From: freeswitch-dev-bounces at lists.freeswitch.org
[mailto:freeswitch-dev-bounces at lists.freeswitch.org] On Behalf Of Michael
Giagnocavo
Sent: Wednesday, November 04, 2009 8:30 PM
To: freeswitch-dev at lists.freeswitch.org
Subject: Re: [Freeswitch-dev] FW: Visual Studio 2008 Pro SP1:
switch_loadable_module.c:871 Error Loading module .... **dll sym error
[127l]

mod_managed is C++ and builds and loads fine. You could look at that and
compare options and code. (Actually, all of the language plugins should be
C++.)

-Michael

-----Original Message-----
From: freeswitch-dev-bounces at lists.freeswitch.org
[mailto:freeswitch-dev-bounces at lists.freeswitch.org] On Behalf Of Alex To
Sent: Wednesday, November 04, 2009 5:02 AM
To: freeswitch-dev at lists.freeswitch.org
Subject: Re: [Freeswitch-dev] FW: Visual Studio 2008 Pro SP1:
switch_loadable_module.c:871 Error Loading module .... **dll sym error
[127l]

Anyone out there have built and loaded successfully a C++ module using
Visual Studio 2008 SP1 with FS?

This error really got me frustrated these few days. I can't seem to load a
C++ module in FS, the error is "dll sym error [1271]"

If I rename the code file to .c or change the compile option to "Compile as
C code", the module loads fine. If I compile using option "Compile as C++
code" then I got the 

error.

Would really appreciate it if anyone could shed some lights. It must be a
setting somewhere in VS or in FS ?? I build FS on Windows 7 x64, VS 2008
SP1, Windows SDK 7.0, build target win32.

Regards

Alex To

-----Original Message-----
From: freeswitch-dev-bounces at lists.freeswitch.org
[mailto:freeswitch-dev-bounces at lists.freeswitch.org] On Behalf Of Giovanni
Maruzzelli
Sent: Sunday, November 01, 2009 9:05 PM
To: freeswitch-dev at lists.freeswitch.org
Subject: Re: [Freeswitch-dev] FW: Visual Studio 2008 Pro SP1:
switch_loadable_module.c:871 Error Loading module .... **dll sym error
[127l]

On Sun, Nov 1, 2009 at 12:44 PM, Alex To <tonhudung at gmail.com> wrote:
> Sorry, I figured it out by myself. It was because my code file is
> mod_mymodule.cpp. I changed it to mod_mymodule.c and the module loaded
file.
> So I take it as FS accepts only C library but not C++ ?

Ciao Alex,

no, you're on the wrong track. FS loads CPP modules.

Your problems probably come because mod_skel is a C module, and the
Makefile for it manages it as a C module.

If you want to compile a CPP module, find one as an example, and
adjust yourmodule and its Makefile to be compiled in a similar way.
I've done it, and I can assure it works.

In this moment I cannot tell you out of my memory which module is CPP,
but just browse the sources looking for *.cc or *.cpp.

-giovanni





>
>
>
> Regards
>
>
>
> Alex To
>
>
>
> From: Alex To [mailto:tonhudung at gmail.com]
> Sent: Sunday, November 01, 2009 7:35 PM
> To: 'freeswitch-dev at lists.freeswitch.org'
> Subject: Visual Studio 2008 Pro SP1: switch_loadable_module.c:871 Error
> Loading module .... **dll sym error [127l]
>
>
>
> Hi, excuse me if this is already asked where else but I did browse through
> the mailing list and I couldn't find anything related. I tried to create a
> new end point module by copying the mod_skel to mod/endpoints/my_module
> folder.
>
>
>
> I modified "skel" to my module name and basically I leave no codes in the
> load function, just a few lines to test if the new module is working.
These
> few lines are:
>
>
>
> *module_interface = switch_loadable_module_create_module_interface(pool,
> modname);
>
>       modem_endpoint_interface =
>
(switch_endpoint_interface_t*)switch_loadable_module_create_interface(*modul
e_interface,
> SWITCH_ENDPOINT_INTERFACE);
>
>       modem_endpoint_interface->interface_name = "modem";
>
>       switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "Hello
> World!\n");
>
>       //
>
>       //do_config(SWITCH_FALSE);
>
>       //
>
>       SWITCH_ADD_API(api_interface, "modem", "Modem API", modem_function,
> "syntax");
>
>
>
>       /* indicate that the module should continue to be loaded */
>
>       return SWITCH_STATUS_SUCCESS;
>
>
>
> It compiles but the module can't load properly. I received the following
> error:
>
>
>
> 2009-11-01 19:18:10.551180 [CRIT] switch_loadable_module.c:871 Error
Loading
> module D:\Projects\freeswitch\Debug\mod\mod_mymodule.dll
>
> **dll sym error [127l]
>
> **
>
> I tried to load module normally at the FS console but "load mod_skel" and
> "load mod_mymodule" gives the same error.
>
>
>
> Would someone tell me what do I miss here.
>
>
>
> Btw, I looked at mod_sofia and mod_iax, this line of code could compile in
> those 2 modules.
>
>
>
> modem_endpoint_interface =
> switch_loadable_module_create_interface(*module_interface,
> SWITCH_ENDPOINT_INTERFACE);
>
>
>
> The same line of code couldn't compile in my module coz VS complains:
cannot
> convert from void* to switch_endpoint_interface_t*. I know C++ require
more
> type-safe conversion than C but anyone got the same error?
>
>
>
> And how would I search in the mailing list ? Sorry for this dumb question
> but I can't seem to find out how to search in the archives. For now,
before
> posting anything, I need to try to browse through all the postings first,
> which is
>
>
>
> quite tedious to do.
>
>
>
> Regards
>
>
>
> Alex To
>
> _______________________________________________
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>
>



-- 
Sincerely,

Giovanni Maruzzelli
Cell : +39-347-2665618

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