Hi Thiago Macieira: thank you for your so quick reply. I think I understand the question. And we think queued messages function is very useful and valueble. Because it is more simple for developer : do not need write the .service file Also this function will not make bad the performance of dbus deamon, for example after a certain time (30 seconds), deamon will delete the queued messages. Is it difficult to implement it? On 1/25/07, Thiago Macieira <<a href="mailto:thiago@kde.org">thiago@kde.org</a>> wrote: > anlong sun wrote: > >When dbus daemon does not have the .service file, the dbus message will > > not be queued if dbus daemon fail to launch application B. > > That is correct. That is the intended behaviour. > > If the target application cannot be launched, then the message cannot be > processed. The caller application will receive an error back. > > >How can I do that : launch B application by myself instead of by dbus > >daemon and still queued the message which can be gotten by B after > >launched? > > You cannot. There is no such thing as queued messages. Either the target > service name exists at the time the message is received by dbus-daemon, > or the daemon knows how to start the service. > > -- >  Thiago Macieira - thiago (AT) <a href="http://macieira.info"> macieira.info</a> - thiago (AT) <a href="http://kde.org">kde.org</a> >   PGP/GPG: 0x6EF45358; fingerprint: >   E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358 > > >