[Kde-pim] Running KMail and calling via D-Bus

[Volker Krause]

On Sunday 02 August 2009 13:30:31 David Jarvie wrote:
> Can anybody help resolve this D-Bus problem with KMail?
>
> KAlarm has functions to invoke KMail and issue a D-Bus call to show a mail.
> The problem is that if KMail isn't already running, the D-Bus call doesn't
> work when called immediately after starting up KMail, since the relevant
> D-Bus interface is not immediately available. I've experimented with
> various tweaks, and compared the code to other places in kdepim, but still
> can't think of any other way of doing it except to introduce timer-based
> calls to wait for the D- Bus interface to become active. Yet other
> applications (KOrganizer etc) don't seem to have this problem (or do they
> just ignore it?).

IIRC KDBusServiceStarter is used there, not sure if that really waits until 
the corresponding service is available though. If you want to be really sure 
that KMail has been started, listening to the serviceOwnerChanged() signal 
might help.

> The relevant code is below. If kmail wasn't running before this is called,
> it always returns with the "KMail not yet available" debug message. If
> called when kmail is already running, it succeeds.
>
> if (KToolInvocation::startServiceByDesktopName("kmail"))
> {
>      kError() << "Couldn't start kmail";
>      return false;
> }
> org::kde::kmail::kmail kmail("org.kde.kmail", "/KMail",
>                                               
> QDBusConnection::sessionBus()); if (!kmail.isValid())
> {
>     kDebug() << "KMail not yet available:" << kmail.lastError().message();
>     return false;
> }
> QDBusReply<bool> reply = kmail.showMail(serialNumber, QString());
> if (!reply.isValid())
>     kError() << "kmail D-Bus call failed:" << reply.error().message();
> else if (!reply.value())
>     kDebug() << "function error";

regards
Volker
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