Re: [libvirt] Using callback under Windows compiling of libvirt library

["Dev.Atom" <arnaud.champion@xxxxxxxxxx>]

I use libportablexdr 4.9.1 from the web site you indicate. I have compile it 
without any problem using the mingwin fedora environment (I have compile all 
under this environment), I haven't modified anything in the source, a simple 
configure like this :

./configure --host=i686-pc-mingw32 --prefix=/usr/i686-pc-mingw32/sys-root/mingw/

then, make and make install, nothing else.

Can explain me or point me on an explaination for registering event-handling 
please ?

--------------------------------------------------
From: "Matthias Bolte" <matthias.bolte@xxxxxxxxxxxxxx>
Sent: Thursday, March 18, 2010 11:39 AM
To: "Dev.Atom" <arnaud.champion@xxxxxxxxxx>
Cc: <libvir-list@xxxxxxxxxx>
Subject: Re: [libvirt] Using callback under Windows compiling of libvirt 
library

> 2010/3/18 Dev.Atom <arnaud.champion@xxxxxxxxxx>:
> > Hi,
> >
> > I have compiled LibVirt 0.7.4 under mingw, and I want to use it with 
> > domain
> > callback. Here is a a code sample of my situation (I'm using visual 
> > studio)
>
> Did you compile it on Windows, or cross-compile it from Linux?
>
> > static
> >
> > int domain_event(virConnectPtr conn,
> >
> > virDomainPtr dom,
> >
> > int evt,
> >
> > int detail,
> >
> > void *opaque)
> >
> > {
> >
> > bool test = true;
> >
> > return 0;
> >
> > }
> >
> > int
> >
> > _tmain(int argc, _TCHAR* argv[])
> >
> > {
> >
> > virConnectPtr conn = virConnectOpen(
> >
> > "qemu+tcp://192.168.220.198/session");
> >
> > // Set Callback
> >
> > int cbresult = virConnectDomainEventRegister(conn, domain_event, NULL,
> > NULL);
> >
> > // Lookup Domain
> >
> > virDomainPtr dom = virDomainLookupByName(conn,
> >
> > "Test1");
> >
> > if (virDomainIsActive(dom) == 1)
> >
> > {
> >
> > // Start Domain
> >
> > int startDom = virDomainCreate(dom);
> >
> > if (startDom != 0)
> >
> > {
> >
> > virErrorPtr e = virGetLastError();
> >
> > bool test = true;
> >
> > }
> >
> > }
> >
> > else
> >
> > {
> >
> > // Stop Domain
> >
> > int StopDom = virDomainDestroy(dom);
> >
> > if (StopDom != 0)
> >
> > {
> >
> > virErrorPtr e = virGetLastError();
> >
> > bool test = true;
> >
> > }
> >
> > }
> >
> > return 0;
> >
> > }
>
> This code is incomplete, you're missing the event-handling, see the
> virEventRegisterImpl function.
>
> Have you tried the domain-event example yet? See
> examples/domain-events/events-c/event-test.c in the libvirt codebase.
>
> > This code works well when I did'nt use callbacks, but when I use it, it
> > throw an error at the virDomainCreate or virDomainDestroy call. In the
> > application windows (console) I have an "unmarshaling msg", I have study 
> > the
> > case it comme from the call of "xdr_string" method in the
> > "xdr_remote_nonull_string" method (remote_protocol.c).
> >
> > I think, the xdr_string method is unable to marshall strings from the 
> > XDR*
> > object to a char**.
>
> Where did you get your XDR lib from? I'm using libportablexdr [1]
> version 4.9.1 on Windows, but had to patch it to get it compile
> correctly with MinGW.
>
> This may be a bug in your XDR lib, or may be a problem in the way
> libvirt uses XDR, or it's just a symptom of that fact that you try to
> use domain events without registering event-handling first.
>
> [1] http://people.redhat.com/~rjones/portablexdr/
>
> Matthias 


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