[maemo-developers] Browsing and opening URLs from within a C application

[From: Kemal Hadimli]

For libconic: Try comparing it with the maemoscrobbler's conic code from here:
https://garage.maemo.org/plugins/scmsvn/viewcvs.php/trunk/src/scrobblerd/scrobblerd.c?root=maemoscrobbler&rev=7&view=markup

Hope it helps.


On 8/24/07, David Hazel <david.hazel at enchaine.com> wrote:
> I'm trying to do two things that I would expect to be very simple on a
> device as internet-enabled as the Nokia N800, but it's proving almost
> impossible to find any documentation that tells me how to go about doing
> either of these things.
>
> Firstly, I need to be able to open a URL and read (programmatically, in
> C) the HTML text that is returned by it. I'm currently trying to do this
> with code similar to the following (which is trying to retrieve the
> required text in the variable actText; url contains the URL that I want
> to open):
>
> gchar *actText   = malloc(<big enough buffer for text>);
> GnomeVFSURI *uri = gnome_vfs_uri_new(url);
> GnomeVFSHandle *gfh = NULL;
> ...
> ConIcConnection *inConn = con_ic_connection_new();
> g_signal_connect(G_OBJECT(inConn), "connection-event",
> G_CALLBACK(inConnCallback), NULL);
>
> if (con_ic_connection_connect(inConn, CON_IC_CONNECT_FLAG_NONE))
> {
>     /* wait for "connection-event" to be flagged by callback function */
>     if (connected)
>     {
>         GnomeVFSResult gres = gnome_vfs_open_uri(&gfh, uri,
> GNOME_VFS_OPEN_READ);
>         if (gres == GNOME_VFS_OK)
>         {
>             GnomeVFSFileSize count = 0;
>             gres = gnome_vfs_read(gfh, actText, buffSize, &count);
>             if (gres != GNOME_VFS_OK)
>             {
>                 /* deal with error */
>             }
>             gres = gnome_vfs_close(gfh);
>
>         }
>         else
>         {
>             /* deal with error */
>         }
>
>         con_ic_connection_disconnect (inConn);
>     }
> }
>
>
> I've tested this code on the emulator on my development system (but not
> on the N800 itself). It is failing even to connect after the
> con_ic_connection_connect call (it times out without the appropriate
> callback handler ever receiving the "connection-event"). If I remove all
> of the "conic" connection logic, the gnome_vfs_open_uri call fails with
> a "Host not found" error.
>
> The questions are:
> (a) am I using the right calls above to enable me to open the URL? and
> (b) if not, what should I be doing? Should I be using something other
> than the "con_ic" and "gnome_vfs" functions?
>
>
> Secondly, I would like to be able to embed a browser within my
> application, so as to provide the user with a means of viewing local
> HTML content. I came across a vague reference somewhere to Mozilla which
> seemed to imply this could somehow be embedded within an application,
> but I couldn't find anything that told me how. (In fact, I even noted
> down "libgtkembedmoz.so" in connection with this, but couldn't find any
> references to the header files that might tell me the functions to use
> for it.) Any ideas? Is it possible to embed a browser within an
> application (by which I mean add a widget to my application window that
> can load and render HTML documents)?
>
>
> In hopeful anticipation,
> David Hazel
>
>
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>


-- 
Kemal