<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#ffffff" text="#000000"> Hi there, <br> <br> sorry for not noticing that the reply-to would not direct my thanks via the dbus-list, which I would like very much, giving the great help Mike Gorse has given! Kudos to Mike!<br> <br> ---rony<br> <br> <br> -------- Original Message -------- <table class="moz-email-headers-table" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject: </th> <td>Re: Request for pointers/hints for processing container arguments ...</td> </tr> <tr> <th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th> <td>Tue, 21 Jun 2011 21:52:07 +0200</td> </tr> <tr> <th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th> <td>rony <a class="moz-txt-link-rfc2396E" href="mailto:rony@wu.ac.at"><rony@wu.ac.at></a></td> </tr> <tr> <th align="RIGHT" nowrap="nowrap" valign="BASELINE">Organization: </th> <td>WU Wien</td> </tr> <tr> <th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th> <td>Mike Gorse <a class="moz-txt-link-rfc2396E" href="mailto:mgorse@novell.com"><mgorse@novell.com></a></td> </tr> </tbody> </table> <br> <br> <pre>Mike: super, thank you *very, very* much for your kind explanations, they really help a *lot* ! This is more than enough "food for thoughts" helping really a lot to go more systematically over the documentation once more! (Your DBUS_TYPE_DICT example is really just extremely instructional!) Best regards, ---rony On 21.06.2011 20:42, Mike Gorse wrote: > Hi Rony, > > Basically you can use dbus_message_iter_open_container and > dbus_message_iter_close_container to write structs/dicts/arrays and > dbus_message_iter_recurse to read them. Dictionaries have a > DBUS_TYPE_DICT (which wants a type that should look something like > {ss}) containing entries (which want a type of NULL). To write a > struct, you can use something like > > dbus_message_iter_open_container (&iter, DBUS_TYPE_STRUCT, NULL, > &iter_struct); > // use dbus_message_iter_append_basic on iter_struct to write your data > dbus_message_iter_close_container (&iter, &iter_struct); > > where "iter" is a DBusMessageIter that you've initialized. For a > dictionary with strings for the key and value, you'd have something like > > dbus_message_iter_open_container (&iter, DBUS_TYPE_DICT< "{ss}", > &iter_dict); > while (more_entries_to_write) { > dbus_message_iter_open_container (&iter_dict, DBUS_TYPE_DICT_ENTRY, > NULL, &iter_dict_entry); > dbus_message_iter_append_basic (&iter_dict_entry, DBUS_TYPE_STRING, > &key); > dbus_message_iter_append_basic (&iter_dict_entry, DBUS_TYPE_STRING, > &val); > dbus_message_iter_close_container (&iter_dict, &iter_dict_entry); > } > dbus_message_iter_close_container (&iter, &iter_dict); > > Arrays can be handled similarly and want a type argument (ie, "i" for > integers), but they can also be handled with the functions you > mentioned. Variants are similar and also want the type to be specified > when opening the container. > > Also, these functions have return values to return errors if they run > out of memory. > > Hth, > -Mike > > On Tue, 21 Jun 2011, rony wrote: > >> Hi there, >> >> my name is Rony and I have started to write a language binding for a >> scripting language named ooRexx (<a class="moz-txt-link-freetext" href="http://www.ooRexx.org">http://www.ooRexx.org</a>). Hence, despite >> all well-meant warnings, I have to delve into the C bindings in order to >> successfully create the binding (starting out for Linux, but aiming also >> on porting later to MacOSX and Windows). >> >> In the process of doing so I have studied the specs, tutorials and >> Matthew Johnsons's *great tutorail* (however, the link on >> <a class="moz-txt-link-rfc2396E" href="http://www.freedesktop.org/wiki/Software/dbus"><http://www.freedesktop.org/wiki/Software/dbus></a> to his tutorial at >> <a class="moz-txt-link-rfc2396E" href="http://dbus.freedesktop.org/doc/dbus/libdbus-tutorial.html"><http://dbus.freedesktop.org/doc/dbus/libdbus-tutorial.html></a> is dead, >> but I managed to get a version on his web site), which has helped me >> a lot. >> >> Currently I am involved in writng the code for processing the ooRexx >> arguments for DBus which now work for all simple types (using >> dbus_message_iter_append_basic(...)). >> >> The next step is to deal with the container types variant, arrays, >> structs and dicts. While studying the specification and the methods in >> DBusMessage (like dbus_message_iter_get_array_len(*iter) or >> dbus_message_iter_get_fixed_array(*iter, void *value, int *n_elements), >> but also dbus_message_iter_append_fixed_array(*iter, int element_type, >> const void *value, int n_elements) etc.) it is the case that I still am >> not able to understand how exactly these types have to be processed. >> >> Any little program/snippet or pseudo code would help me a lot and hence >> turning to this list of experts to ask for help! >> >> If you have pointers to any plain C code (glib's binding won't help me >> unfortunately) or would be kind enough to simply sketch in scarce >> pseudocode how to create those container values for message arguments, I >> would *really* appreciate it a lot! >> >> TIA, >> >> ---rony >> >> P.S.: If anyone has anything comparable to Matthew Johnson's tutorial, >> but demoing how to process container values, that would be a boon! >> >> >> _______________________________________________ >> dbus mailing list >> <a class="moz-txt-link-abbreviated" href="mailto:dbus@lists.freedesktop.org">dbus@lists.freedesktop.org</a> >> <a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/dbus">http://lists.freedesktop.org/mailman/listinfo/dbus</a> >></pre> <br> </body> </html>