Re: [Boost-users] [Boost.Serialization] St8bad_cast during serialization

7 Jan 2007

      Thanks for replying.

On 1/7/07, Robert Ramey  wrote:
...
A couple of observations:
a) you might try using xml_?archives for debugging.  The consume more space
are
are easier to interpret.
I've used xml_?archives now. The output looks satisfactory.

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE boost_serialization>

<moduleName>core</moduleName>
LogMessage
-1210130444
<msg class_id="1" class_name="Sadrok::LogMessage" tracking_level="1"
version="0" object_id="_0">
	<Message class_id="0" tracking_level="1" version="0" object_id="_1">
		Just testing
	</Message>
	<logLevel>0</logLevel>
	<logTime>1168162900</logTime>
	<logMessage>Loaded module log from file modules/liblog.so pid
31525</logMessage>
</msg>

I notice that the XML is not completed, but this doesn't seem to be a problem.
...
b) Could it be that you are doing something like:
ar << lm ;  // pointer to LogMessage
...
ar >> m; // pointer to Message
I'm saving and loading using a pointer to Message.
...
If this doesn't help, make a small test which just serializes and
de-serializes
and we can take a look at it.
I did a small test loading the resultant XML from a file. It uses code
copy & pasted from the program. The test works perfectly.

I would expect that if I did something obviously wrong I would've
gotten one of boost's exceptions (like unregistered_class) and I could
fix my error. I however don't know why bad_cast gets thrown.
For now I'll have to rip apart this program and try to reconstruct it
piece by piece in a test program until the error pops up again.
...
Robert Ramey
sadrok wrote:
...
My application saves message classes derived from a Message base class
(it has a virtual deconstructor) and sends this serialized data over a
UNIX socket for IPC between interconnected processes.
-- 
sadrok@gmail.com

Yahoo! IM: sadrok_za
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