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authorAllen Winter <allen.winter@kdab.com>2014-05-31 17:22:41 -0400
committerAllen Winter <allen.winter@kdab.com>2014-05-31 17:22:41 -0400
commitbc831ea040913b1069e8eaf99496dc12704b94a9 (patch)
tree1502b86977c42dd5e5d202a2ff3807b08309f9ff /examples/access_components.c
parentc1d3761c08651f469a3bd3a8130e6005b8e26136 (diff)
downloadlibical-git-bc831ea040913b1069e8eaf99496dc12704b94a9.tar.gz
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+/* Access_component.c */
+
+#include <libical/ical.h>
+
+#include <assert.h>
+#include <string.h> /* for strdup */
+#include <stdlib.h> /* for malloc */
+#include <stdio.h> /* for printf */
+#include <time.h> /* for time() */
+
+void do_something(icalcomponent *c);
+
+/* Creating iCal Components
+
+ There are two ways to create new component in libical. You can
+ build the component from primitive parts, or you can create it
+ from a string.
+
+ There are two variations of the API for building the component from
+ primitive parts. In the first variation, you add each parameter and
+ value to a property, and then add each property to a
+ component. This results in a long series of function calls. This
+ style is show in create_new_component()
+
+ The second variation uses vargs lists to nest many primitive part
+ constructors, resulting in a compact, neatly formated way to create
+ components. This style is shown in create_new_component_with_va_args()
+
+
+
+*/
+
+icalcomponent* create_new_component()
+{
+
+ /* variable definitions */
+ icalcomponent* calendar;
+ icalcomponent* event;
+ struct icaltimetype atime = icaltime_from_timet( time(0),0);
+ struct icalperiodtype rtime;
+ icalproperty* property;
+
+ /* Define a time type that will use as data later. */
+ rtime.start = icaltime_from_timet( time(0),0);
+ rtime.end = icaltime_from_timet( time(0),0);
+ rtime.end.hour++;
+
+ /* Create calendar and add properties */
+
+ calendar = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
+
+ /* Nearly every libical function call has the same general
+ form. The first part of the name defines the 'class' for the
+ function, and the first argument will be a pointer to a struct
+ of that class. So, icalcomponent_ functions will all take
+ icalcomponent* as their first argument. */
+
+ /* The next call creates a new proeprty and immediately adds it to the
+ 'calendar' component. */
+
+ icalcomponent_add_property(
+ calendar,
+ icalproperty_new_version("2.0")
+ );
+
+
+ /* Here is the short version of the memory rules:
+
+ If the routine name has "new" in it:
+ Caller owns the returned memory.
+ If you pass in a string, the routine takes the memory.
+
+ If the routine name has "add" in it:
+ The routine takes control of the component, property,
+ parameter or value memory.
+
+ If the routine returns a string ( "get" and "as_ical_string" )
+ The library owns the returned memory.
+
+ There are more rules, so refer to the documentation for more
+ details.
+
+ */
+
+ icalcomponent_add_property(
+ calendar,
+ icalproperty_new_prodid("-//RDU Software//NONSGML HandCal//EN")
+ );
+
+ /* Add an event */
+
+ event = icalcomponent_new(ICAL_VEVENT_COMPONENT);
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_dtstamp(atime)
+ );
+
+ /* In the previous call, atime is a struct, and it is passed in by value.
+ This is how all compound types of values are handled. */
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_uid("guid-1.host1.com")
+ );
+
+ /* add a property that has parameters */
+ property = icalproperty_new_organizer("mailto:mrbig@host.com");
+
+ icalproperty_add_parameter(
+ property,
+ icalparameter_new_role(ICAL_ROLE_CHAIR)
+ );
+
+ icalcomponent_add_property(event,property);
+
+ /* In this style of component creation, you need to use an extra
+ call to add parameters to properties, but the form of this
+ operation is the same as adding a property to a component */
+
+ /* add another property that has parameters */
+ property = icalproperty_new_attendee("mailto:employee-A@host.com");
+
+ icalproperty_add_parameter(
+ property,
+ icalparameter_new_role(ICAL_ROLE_REQPARTICIPANT)
+ );
+
+ icalproperty_add_parameter(
+ property,
+ icalparameter_new_rsvp(1)
+ );
+
+ icalproperty_add_parameter(
+ property,
+ icalparameter_new_cutype(ICAL_CUTYPE_GROUP)
+ );
+
+ icalcomponent_add_property(event,property);
+
+
+ /* more properties */
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_description("Project XYZ Review Meeting")
+ );
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_categories("MEETING")
+ );
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_class(ICAL_CLASS_PUBLIC)
+ );
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_created(atime)
+ );
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_summary("XYZ Project Review")
+ );
+
+ property = icalproperty_new_dtstart(atime);
+
+ icalproperty_add_parameter(
+ property,
+ icalparameter_new_tzid("US-Eastern")
+ );
+
+ icalcomponent_add_property(event,property);
+
+
+ property = icalproperty_new_dtend(atime);
+
+ icalproperty_add_parameter(
+ property,
+ icalparameter_new_tzid("US-Eastern")
+ );
+
+ icalcomponent_add_property(event,property);
+
+ icalcomponent_add_property(
+ event,
+ icalproperty_new_location("1CP Conference Room 4350")
+ );
+
+ icalcomponent_add_component(calendar,event);
+
+ return calendar;
+}
+
+
+/* Now, create the same component as in the previous routine, but use
+the constructor style. */
+
+icalcomponent* create_new_component_with_va_args()
+{
+
+ /* This is a similar set up to the last routine */
+ icalcomponent* calendar;
+ struct icaltimetype atime = icaltime_from_timet( time(0),0);
+ struct icalperiodtype rtime;
+
+ rtime.start = icaltime_from_timet( time(0),0);
+ rtime.end = icaltime_from_timet( time(0),0);
+ rtime.end.hour++;
+
+ /* Some of these routines are the same as those in the previous
+ routine, but we've also added several 'vanew' routines. These
+ 'vanew' routines take a list of properties, parameters or
+ values and add each of them to the parent property or
+ component. */
+
+ calendar =
+ icalcomponent_vanew(
+ ICAL_VCALENDAR_COMPONENT,
+ icalproperty_new_version("2.0"),
+ icalproperty_new_prodid("-//RDU Software//NONSGML HandCal//EN"),
+ icalcomponent_vanew(
+ ICAL_VEVENT_COMPONENT,
+ icalproperty_new_dtstamp(atime),
+ icalproperty_new_uid("guid-1.host1.com"),
+ icalproperty_vanew_organizer(
+ "mailto:mrbig@host.com",
+ icalparameter_new_role(ICAL_ROLE_CHAIR),
+ 0
+ ),
+ icalproperty_vanew_attendee(
+ "mailto:employee-A@host.com",
+ icalparameter_new_role(ICAL_ROLE_REQPARTICIPANT),
+ icalparameter_new_rsvp(1),
+ icalparameter_new_cutype(ICAL_CUTYPE_GROUP),
+ 0
+ ),
+ icalproperty_new_description("Project XYZ Review Meeting"),
+
+ icalproperty_new_categories("MEETING"),
+ icalproperty_new_class(ICAL_CLASS_PUBLIC),
+ icalproperty_new_created(atime),
+ icalproperty_new_summary("XYZ Project Review"),
+ icalproperty_vanew_dtstart(
+ atime,
+ icalparameter_new_tzid("US-Eastern"),
+ 0
+ ),
+ icalproperty_vanew_dtend(
+ atime,
+ icalparameter_new_tzid("US-Eastern"),
+ 0
+ ),
+ icalproperty_new_location("1CP Conference Room 4350"),
+ 0
+ ),
+ 0
+ );
+
+
+ /* Note that properties with no parameters can use the regular
+ 'new' constructor, while those with parameters use the 'vanew'
+ constructor. And, be sure that the last argument in the 'vanew'
+ call is a zero. Without, your program will probably crash. */
+
+ return calendar;
+}
+
+
+void find_sub_components(icalcomponent* comp)
+{
+ icalcomponent *c;
+
+ /* The second parameter to icalcomponent_get_first_component
+ indicates the type of component to search for. This will
+ iterate through all sub-components */
+ for(c = icalcomponent_get_first_component(comp,ICAL_ANY_COMPONENT);
+ c != 0;
+ c = icalcomponent_get_next_component(comp,ICAL_ANY_COMPONENT)){
+
+ do_something(c);
+ }
+
+ /* This will iterate only though VEVENT sub-components */
+
+ for(c = icalcomponent_get_first_component(comp,ICAL_VEVENT_COMPONENT);
+ c != 0;
+ c = icalcomponent_get_next_component(comp,ICAL_VEVENT_COMPONENT)){
+
+ do_something(c);
+ }
+
+}
+
+/* Ical components only have one internal iterator, so removing the
+ object that the iterator points to can cause problems. Here is the
+ right way to remove components */
+
+void remove_vevent_sub_components(icalcomponent* comp){
+
+ icalcomponent *c, *next;
+
+ for( c = icalcomponent_get_first_component(comp,ICAL_VEVENT_COMPONENT);
+ c != 0;
+ c = next)
+ {
+ next = icalcomponent_get_next_component(comp,ICAL_VEVENT_COMPONENT);
+
+ icalcomponent_remove_component(comp,c);
+
+ do_something(c);
+ }
+
+}
+