dbus-cplusplus-devel

[dbus-cplusplus-devel] Assertion error with MessageIter - arguments to dbus_message_iter_open_container() were incorrect

[Roy S. (RBEI/ECG1) <Roy...@in...>]

Hi,

I am using the dbus-c++ binding to create a proxy for connman's Service API which is exposed on dbus.
The method found in connman's Service interface xml, looks like so:

        <method name="GetProperties">
        <arg type="a{sv}" direction="out"/>
        </method>

The proxy file that was auto-generated using "dbusxx-xml2cpp" utility,
created the method in question like so:

        Line 1:    std::map< std::string, ::DBus::Variant > GetProperties()
        Line 2:    {
        Line 3:        ::DBus::CallMessage call;
        Line 4:        call.member("GetProperties");
        Line 5:        ::DBus::Message ret = invoke_method (call);
        Line 6:        ::DBus::MessageIter ri = ret.reader();
        Line 7:        std::map< std::string, ::DBus::Variant > argout;
        Line 8:        ri >> argout;
        Line 9:        return argout;
        Line 10:    }


It's on Line 8, that I get the warning/error,
on x86 running Ubuntu 11.04 with libdbus-c++-1-0 package(0~20110310-1ubuntu1):

process 30342: arguments to dbus_message_iter_open_container() were incorrect, assertion "(type == DBUS_TYPE_STRUCT && contained_signature == NULL) || (type == DBUS_TYPE_DICT_ENTRY && contained_signature == NULL) || (type == DBUS_TYPE_VARIANT && contained_signature != NULL) || (type == DBUS_TYPE_ARRAY && contained_signature != NULL)" failed in file dbus-message.c line 2677.
This is normally a bug in some application using the D-Bus library.
process 30342: dbus message iterator looks uninitialized or corrupted

....and lots more..... But the process does not terminate/abort here.

On meego however, running on an arm based target,
the process TERMINATES after this assertion error!

The package used in meego on the arm based board is:
        libdbus-c++-0.5.1-4.3.armv7hl.rpm
        libdbus-c++-devel-0.5.1-4.3.armv7hl.rpm

Please help in resolving this issue.
Is there another way in which the iterator can insert the DICT value - (std::map< std::string, ::DBus::Variant > ) without throwing these assertion errors?

Any help woule be appreciated.

-Roy Samuel.

Re: [dbus-cplusplus-devel] Assertion error with MessageIter - arguments to dbus_message_iter_open_container() were incorrect

[Andreas V. <li...@br...>]

Am Fri, 6 Jan 2012 12:38:56 +0800 schrieb Roy Samuel (RBEI/ECG1):

> Hi,
> 
> I am using the dbus-c++ binding to create a proxy for connman's
> Service API which is exposed on dbus. The method found in connman's
> Service interface xml, looks like so:
> 
>         <method name="GetProperties">
>         <arg type="a{sv}" direction="out"/>
>         </method>
> 
> The proxy file that was auto-generated using "dbusxx-xml2cpp" utility,
> created the method in question like so:
> 
>         Line 1:    std::map< std::string, ::DBus::Variant >
> GetProperties() Line 2:    {
>         Line 3:        ::DBus::CallMessage call;
>         Line 4:        call.member("GetProperties");
>         Line 5:        ::DBus::Message ret = invoke_method (call);
>         Line 6:        ::DBus::MessageIter ri = ret.reader();
>         Line 7:        std::map< std::string, ::DBus::Variant >
> argout; Line 8:        ri >> argout;
>         Line 9:        return argout;
>         Line 10:    }
> 
> 
> It's on Line 8, that I get the warning/error,
> on x86 running Ubuntu 11.04 with libdbus-c++-1-0
> package(0~20110310-1ubuntu1):
> 
> process 30342: arguments to dbus_message_iter_open_container() were
> incorrect, assertion "(type == DBUS_TYPE_STRUCT &&
> contained_signature == NULL) || (type == DBUS_TYPE_DICT_ENTRY &&
> contained_signature == NULL) || (type == DBUS_TYPE_VARIANT &&
> contained_signature != NULL) || (type == DBUS_TYPE_ARRAY &&
> contained_signature != NULL)" failed in file dbus-message.c line
> 2677. This is normally a bug in some application using the D-Bus
> library. process 30342: dbus message iterator looks uninitialized or
> corrupted
> 
> ....and lots more..... But the process does not terminate/abort here.
> 
> On meego however, running on an arm based target,
> the process TERMINATES after this assertion error!
> 
> The package used in meego on the arm based board is:
>         libdbus-c++-0.5.1-4.3.armv7hl.rpm
>         libdbus-c++-devel-0.5.1-4.3.armv7hl.rpm
> 
> Please help in resolving this issue.
> Is there another way in which the iterator can insert the DICT value
> - (std::map< std::string, ::DBus::Variant > ) without throwing these
> assertion errors?
> 
> Any help woule be appreciated.

Thank you very much for this report. I really don't use ofter "out"
values in methods. So it couldn't say it's working for sure. I'll check
this in near future and enhance unit tests for "out" values.

Does this only happen with std::map or also with other types?

Could you please create an trouble ticket in sf.net project as further
reference about this?

regards
	Andreas

-- 
Technical Blog <http://andreasvolz.wordpress.com/>

Re: [dbus-cplusplus-devel] Assertion error with MessageIter - arguments to dbus_message_iter_open_container() were incorrect

[Roy S. (RBEI/ECG1) <Roy...@in...>]

Hi Andreas,

Thank you for your response. :)
As for your question : "Does this only happen with std::map or also with other types?"
I've found that simple return types, that are of primitive types, like boolean, string, etc. work just fine.

However, for maps, vectors it throws assertion errors.

I have posted a bug on sf.net, as per your suggestion. (https://sourceforge.net/tracker/?func=detail&aid=3471247&group_id=236997&atid=1101682)
I've marked it as a high priority bug, as it causes termination of process.

Best Regards,
        Roy


-----Original Message-----
From: Andreas Volz [mailto:li...@br...]
Sent: Saturday, January 07, 2012 4:25 AM
To: dbu...@li...
Subject: Re: [dbus-cplusplus-devel] Assertion error with MessageIter - arguments to dbus_message_iter_open_container() were incorrect

Am Fri, 6 Jan 2012 12:38:56 +0800 schrieb Roy Samuel (RBEI/ECG1):

> Hi,
>
> I am using the dbus-c++ binding to create a proxy for connman's
> Service API which is exposed on dbus. The method found in connman's
> Service interface xml, looks like so:
>
>         <method name="GetProperties">
>         <arg type="a{sv}" direction="out"/>
>         </method>
>
> The proxy file that was auto-generated using "dbusxx-xml2cpp" utility,
> created the method in question like so:
>
>         Line 1:    std::map< std::string, ::DBus::Variant >
> GetProperties() Line 2:    {
>         Line 3:        ::DBus::CallMessage call;
>         Line 4:        call.member("GetProperties");
>         Line 5:        ::DBus::Message ret = invoke_method (call);
>         Line 6:        ::DBus::MessageIter ri = ret.reader();
>         Line 7:        std::map< std::string, ::DBus::Variant >
> argout; Line 8:        ri >> argout;
>         Line 9:        return argout;
>         Line 10:    }
>
>
> It's on Line 8, that I get the warning/error,
> on x86 running Ubuntu 11.04 with libdbus-c++-1-0
> package(0~20110310-1ubuntu1):
>
> process 30342: arguments to dbus_message_iter_open_container() were
> incorrect, assertion "(type == DBUS_TYPE_STRUCT &&
> contained_signature == NULL) || (type == DBUS_TYPE_DICT_ENTRY &&
> contained_signature == NULL) || (type == DBUS_TYPE_VARIANT &&
> contained_signature != NULL) || (type == DBUS_TYPE_ARRAY &&
> contained_signature != NULL)" failed in file dbus-message.c line
> 2677. This is normally a bug in some application using the D-Bus
> library. process 30342: dbus message iterator looks uninitialized or
> corrupted
>
> ....and lots more..... But the process does not terminate/abort here.
>
> On meego however, running on an arm based target,
> the process TERMINATES after this assertion error!
>
> The package used in meego on the arm based board is:
>         libdbus-c++-0.5.1-4.3.armv7hl.rpm
>         libdbus-c++-devel-0.5.1-4.3.armv7hl.rpm
>
> Please help in resolving this issue.
> Is there another way in which the iterator can insert the DICT value
> - (std::map< std::string, ::DBus::Variant > ) without throwing these
> assertion errors?
>
> Any help woule be appreciated.

Thank you very much for this report. I really don't use ofter "out"
values in methods. So it couldn't say it's working for sure. I'll check
this in near future and enhance unit tests for "out" values.

Does this only happen with std::map or also with other types?

Could you please create an trouble ticket in sf.net project as further
reference about this?

regards
        Andreas

--
Technical Blog <http://andreasvolz.wordpress.com/>

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