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Contacts API Usage

Introduction

This section provides some examples of common usage of the Qt Contacts API. The most common use of the API is to retrieve a contact and then display certain details of that contact. To do so, several steps must be taken:

  • A contact manager must be instantiated
  • The contact must be retrieved from the manager
  • The required details of the contact must be selected from the contact

The first step is usually as simple as:

 QContactManager cm; // instantiate the default manager

The second step requires either a filtering operation, or, if the id of the contact is already known, a direct selection operation. If you are interested in all contacts, a "default filter" retrieve operation is used. The retrieval operations may either be synchronous or asynchronous; we recommend using asynchronous operations for applications which require a responsive user interface. For simplicity, however, the example below uses the synchronous API to retrieve all contacts:

 QList<QContact> allContacts = cm.contacts();

The third step may be performed in several ways. The recommended way is to utilize the templated detail accessor, if you know which type of detail you are interested in:

 QContact firstContact = allContacts.first();
 qDebug() << "The first contact has a phone number:" << firstContact.detail<QContactPhoneNumber>().number();

Alternatively, you can use the base QContactDetail class methods to select the detail in which you are interested in, and the field keys specified in the derived class to select the value which you are interested in:

 qDebug() << "The first contact has a phone number:" << firstContact.detail(QContactPhoneNumber::DefinitionName).value(QContactPhoneNumber::FieldNumber);

Note that in each case, if the contact did not have a phone number detail, the return value of QContact::detail() is an empty detail. Also note that in the first case, the return value will be of the QContactPhoneNumber detail type, whereas in the second case, the return value will be of the QContactDetail (base-class detail) type -- although the actual detail returned in both cases is exactly the same.

If you wish to retrieve all of the details of a contact, you may do something similar to:

 QList<QContactDetail> allDetails = firstContact.details();

Alternatively, if you wish only to retrieve the details which are of some particular type, you can use either the templated or non-templated accessor:

 QList<QContactPhoneNumber> allPhoneNumbers = firstContact.details<QContactPhoneNumber>();
 QList<QContactDetail> allPhoneNumbers2 = firstContact.details(QContactPhoneNumber::DefinitionName);

Note that in each case, if the contact did not have any phone number details, the return value of QContact::details() is an empty list. Also note that in the first case, the return value will be a list of the QContactPhoneNumber detail type, whereas in the second case, the return value will be a list of the QContactDetail (base-class detail) type -- although the actual details returned in both cases will be exactly the same.

The next most common use of the API is to save a contact. Such an operation consists of two steps:

  • Saving a detail in a contact
  • Saving the contact in a manager

Removing a contact is done similarly to saving a contact. An example of these two operations is given below. Note that it uses the synchronous API to save and remove the contact, although in a real application we recommend using the asynchronous API to perform such manager-related operations.

 QContactPhoneNumber newPhoneNumber;       // create the detail to add
 newPhoneNumber.setNumber("12345");        // set the value(s) to save
 firstContact.saveDetail(&newPhoneNumber); // save the detail in the contact
 cm.saveContact(&firstContact);            // save the contact in the manager
 cm.removeContact(firstContact.id()); // remove the contact from the manager

That's it! For more in-depth discussion of usage of the API, see the sections below.

Manager Settings And Configuration

Users of the contacts API can define which backend they wish to access if a manager for that backend is available. The list of available managers can be queried programmatically at run-time, and the capabilities of different managers can be ascertained by inspecting a QContactManager instance. Furthermore, some managers can be constructed with parameters which affect the operation of the backend.

Loading the default manager for the platform

Most users of the API will want to use the default manager for the platform, which provides access to the system address book. Instantiating a manager by using the default constructor will result in the default manager for that platform being instantiated.

The default constructor can either be used to create a manager on the stack, in which case it will be deleted automatically when it goes out of scope:

     QContactManager stackDefaultContactManager;

or it can be used explicitly to create a manager on the heap, in which case the client must ensure that they delete the manager when they are finished with it in order to avoid a memory leak:

     QContactManager *heapDefaultContactManager = new QContactManager;
     // ... perform contact manipulation
     delete heapDefaultContactManager;

Querying a manager for capabilities

Different managers will support different capabilities and details. Clients can use the meta data reporting functions of QContactManager to determine what the capabilities of the manager they have instantiated might be.

     QContactManager cm;
     qDebug() << "The default manager for the platform is:" << cm.managerName();
     qDebug() << "It" << (cm.isRelationshipTypeSupported(QContactRelationship::HasAssistant) ? "supports" : "does not support") << "assistant relationships.";
     qDebug() << "It" << (cm.supportedContactTypes().contains(QContactType::TypeGroup) ? "supports" : "does not support") << "groups.";

Loading the manager for a specific backend

In this example, the client loads a manager for a specific backend. While this could be found and retrieved using a more advanced plugin framework (such as the Qt Service Framework), this code assumes that the client has prior knowledge of the backend in question.

Clients may wish to use this feature of the API if they wish to store or retrieve contact information to a particular manager (for example, one that interfaces with a particular online service).

     QContactManager contactManager("KABC");

Loading a manager with specific parameters

The client loads a manager with specific parameters defined. The parameters which are available are backend specific, and so the client had to know that the "Settings" parameter was valid for the particular backend, and what argument it took. In this example, the client tells the backend to load detail definitions saved in a particular settings file.

     QMap<QString, QString> parameters;
     parameters.insert("Settings", "~/.qcontactmanager-kabc-settings.ini");
     QContactManager contactManager("KABC", parameters);

Contact Detail Manipulation

Once a contact has been created (or retrieved from a manager), the client can retrieve, create, update or delete details from the contact. Since QContact and QContactDetail are both container (value) classes, the API offered for these operations is purely synchronous.

A contact consists of the details it contains, as well as an id. Some details are read-only (such as the display label of a contact) or irremovable (like the type of a contact), but most are freely modifiable by clients.

Adding a detail to a contact

The client adds a name and a phone number to a contact.

     QContact exampleContact;

     QContactName nameDetail;
     nameDetail.setFirstName("Adam");
     nameDetail.setLastName("Unlikely");

     QContactPhoneNumber phoneNumberDetail;
     phoneNumberDetail.setNumber("+123 4567");

     exampleContact.saveDetail(&nameDetail);
     exampleContact.saveDetail(&phoneNumberDetail);

Updating a detail in a contact

The client updates the phone number of a contact.

     phoneNumberDetail.setNumber("+123 9876");
     exampleContact.saveDetail(&phoneNumberDetail); // overwrites old value on save

Removing a detail from a contact

The client removes the phone number of a contact.

     exampleContact.removeDetail(&phoneNumberDetail);

Viewing a specific detail of a contact

The client retrieves and displays the first phone number of a contact

 void viewSpecificDetail(QContactManager* cm)
 {
     QList<QContactId> contactIds = cm->contactIds();
     QContact a = cm->contact(contactIds.first());
     qDebug() << "The first phone number of" << a.displayLabel()
              << "is" << a.detail(QContactPhoneNumber::Type).value(QContactPhoneNumber::FieldNumber);
 }

Viewing all of the details of a contact

The client retrieves all of the details of a contact, and displays them

 void viewDetails(QContactManager* cm)
 {
     QList<QContactId> contactIds = cm->contactIds();
     QContact a = cm->contact(contactIds.first());
     qDebug() << "Viewing the details of" << a.displayLabel();

     QList<QContactDetail> allDetails = a.details();
     for (int i = 0; i < allDetails.size(); i++) {
         QContactDetail detail = allDetails.at(i);
         QVariantMap fields = detail.variantValues();

         qDebug("\tDetail #%d (%d):", i, detail.type());
         foreach (const QString& fieldKey, fields.keys()) {
             qDebug() << "\t\t" << fieldKey << "(" << fields.value(fieldKey).dataType() << ") =" << detail.value(fieldKey);
         }
         qDebug();
     }
 }

It is important to note that details are implicitly shared objects with particular semantics surrounding saving, removal and modification. The following example demonstrates these semantics

 void detailSharing(QContactManager* cm)
 {
     QList<QContactId> contactIds = cm->contactIds();
     QContact a = cm->contact(contactIds.first());
     qDebug() << "Demonstrating detail sharing semantics with" << a.displayLabel();

     /* Create a new phone number detail. */
     QContactPhoneNumber newNumber;
     newNumber.setNumber("123123123");
     qDebug() << "\tThe new phone number is" << newNumber.number();

     /*
      * Create a copy of that detail.  These will be implicitly shared;
      * changes to nnCopy will not affect newNumber, and vice versa.
      * However, attempting to save them will cause overwrite to occur.
      * Removal is done purely via key() checking, also.
      */
     QContactPhoneNumber nnCopy(newNumber);
     nnCopy.setNumber("456456456");
     qDebug() << "\tThat number is still" << newNumber.number() << ", the copy is" << nnCopy.number();

     /* Save the detail in the contact, then remove via the copy, then resave. */
     a.saveDetail(&newNumber);
     a.removeDetail(&nnCopy);  // identical to a.removeDetail(&newNumber);
     a.saveDetail(&newNumber); // since newNumber.key() == nnCopy.key();

     /* Saving will cause overwrite */
     qDebug() << "\tPrior to saving nnCopy," << a.displayLabel() << "has" << a.details().count() << "details.";
     a.saveDetail(&nnCopy);
     qDebug() << "\tAfter saving nnCopy," << a.displayLabel() << "still has" << a.details().count() << "details.";

     /* In order to save nnCopy as a new detail, we must reset its key */
     nnCopy.resetKey();
     qDebug() << "\tThe copy key is now" << nnCopy.key() << ", whereas the original key is" << newNumber.key();
     qDebug() << "\tPrior to saving (key reset) nnCopy," << a.displayLabel() << "has" << a.details().count() << "details.";
     a.saveDetail(&nnCopy);
     qDebug() << "\tAfter saving (key reset) nnCopy," << a.displayLabel() << "still has" << a.details().count() << "details.";
     a.removeDetail(&nnCopy);

     /*
      * Note that changes made to details are not
      * propagated automatically to the contact.
      * To persist changes to a detail, you must call saveDetail().
      */
     QList<QContactPhoneNumber> allNumbers = a.details<QContactPhoneNumber>();
     foreach (const QContactPhoneNumber& savedPhn, allNumbers) {
         if (savedPhn.key() != newNumber.key()) {
             continue;
         }

         /*
          * This phone number is the saved copy of the newNumber detail.
          * It is detached from the newNumber detail, so changes to newNumber
          * shouldn't affect savedPhn until saveDetail() is called again.
          */
         qDebug() << "\tCurrently, the (stack) newNumber is" << newNumber.number()
                  << ", and the saved newNumber is" << savedPhn.number();
         newNumber.setNumber("678678678");
         qDebug() << "\tNow, the (stack) newNumber is" << newNumber.number()
                  << ", but the saved newNumber is" << savedPhn.number();
     }

     /*
      * Removal of the detail depends only on the key of the detail; the fact
      * that the values differ is not taken into account by the remove operation.
      */
     a.removeDetail(&newNumber) ? qDebug() << "\tSucceeded in removing the temporary detail."
                                : qDebug() << "\tFailed to remove the temporary detail.\n";
 }

Persistent Contact Information

After instantiating a manager, clients will wish to retrieve or modify contact information (including relationships and possibly detail definitions) which is persistently stored in the manager (for example, in a database or online cloud).

If the client wishes to use the asynchronous API, it is suggested that their class uses member variables for the manager and requests, similarly to:

 QTM_USE_NAMESPACE
 class AsyncRequestExample : public QObject
 {
     Q_OBJECT

 public:
     AsyncRequestExample();
     ~AsyncRequestExample();

 public slots:
     void performRequests();

 private slots:
     void contactFetchRequestStateChanged(QContactAbstractRequest::State newState);
     void contactSaveRequestStateChanged(QContactAbstractRequest::State newState);
     void contactRemoveRequestStateChanged(QContactAbstractRequest::State newState);
     void relationshipFetchRequestStateChanged(QContactAbstractRequest::State newState);
     void relationshipSaveRequestStateChanged(QContactAbstractRequest::State newState);
     void relationshipRemoveRequestStateChanged(QContactAbstractRequest::State newState);

 private:
     QContactManager *m_manager;
     QContactFetchRequest m_contactFetchRequest;
     QContactSaveRequest m_contactSaveRequest;
     QContactRemoveRequest m_contactRemoveRequest;
     QContactRelationshipFetchRequest m_relationshipFetchRequest;
     QContactRelationshipSaveRequest m_relationshipSaveRequest;
     QContactRelationshipRemoveRequest m_relationshipRemoveRequest;
 };

This allows them to define slots which deal with the data as required when the state of the request changes:

 void AsyncRequestExample::contactFetchRequestStateChanged(QContactAbstractRequest::State newState)
 {
     if (newState == QContactAbstractRequest::FinishedState) {
         QContactFetchRequest *request = qobject_cast<QContactFetchRequest*>(QObject::sender());
         if (request->error() != QContactManager::NoError) {
             qDebug() << "Error" << request->error() << "occurred during fetch request!";
             return;
         }

         QList<QContact> results = request->contacts();
         for (int i = 0; i < results.size(); i++) {
             qDebug() << "Retrieved contact:" << results.at(i).displayLabel();
         }
     } else if (newState == QContactAbstractRequest::CanceledState) {
         qDebug() << "Fetch operation canceled!";
     }
 }

Note that if the client is interested in receiving the results of the request as they become available, rather than only the final set of results once the request changes state (to FinishedState, for example), the client should instead connect the QContactAbstractRequest::resultsAvailable() signal to the slot which deals with the results.

Creating a new contact in a manager

The client creates a new contact and saves it in a manager

     QContact exampleContact;

     QContactName nameDetail;
     nameDetail.setFirstName("Adam");
     nameDetail.setLastName("Unlikely");

     QContactPhoneNumber phoneNumberDetail;
     phoneNumberDetail.setNumber("+123 4567");

     exampleContact.saveDetail(&nameDetail);
     exampleContact.saveDetail(&phoneNumberDetail);

     // save the newly created contact in the manager
     connect(&m_contactSaveRequest, SIGNAL(stateChanged(QContactAbstractRequest::State)), this, SLOT(contactSaveRequestStateChanged(QContactAbstractRequest::State)));
     m_contactSaveRequest.setManager(m_manager);
     m_contactSaveRequest.setContacts(QList<QContact>() << exampleContact);
     m_contactSaveRequest.start();

Alternatively, the client can explicitly block execution until the request is complete, by doing something like:

     m_contactSaveRequest.setManager(m_manager);
     m_contactSaveRequest.setContacts(QList<QContact>() << exampleContact);
     m_contactSaveRequest.start();
     m_contactSaveRequest.waitForFinished();
     QList<QContact> savedContacts = m_contactSaveRequest.contacts();

The equivalent code using the synchronous API looks like:

     QContact exampleContact;

     QContactName nameDetail;
     nameDetail.setFirstName("Adam");
     nameDetail.setLastName("Unlikely");

     QContactPhoneNumber phoneNumberDetail;
     phoneNumberDetail.setNumber("+123 4567");

     exampleContact.saveDetail(&nameDetail);
     exampleContact.saveDetail(&phoneNumberDetail);

     // save the newly created contact in the manager
     if (!m_manager.saveContact(&exampleContact))
         qDebug() << "Error" << m_manager.error() << "occurred whilst saving contact!";

Retrieving contacts from a manager

The client requests all contacts from the manager which match a particular filter.

     connect(&m_contactFetchRequest, SIGNAL(stateChanged(QContactAbstractRequest::State)), this, SLOT(contactFetchRequestStateChanged(QContactAbstractRequest::State)));
     m_contactFetchRequest.setManager(m_manager);
     m_contactFetchRequest.setFilter(QContactPhoneNumber::match("+123 4567"));
     m_contactFetchRequest.start();

The equivalent code using the synchronous API looks like:

     QList<QContact> results = m_manager.contacts(QContactPhoneNumber::match("+123 4567"));

The client can also retrieve a particular existing contact from a manager, by directly requesting the contact with a particular (previously known) id. With the asynchronous API, this takes the form of another filter:

     QContactIdFilter idListFilter;
     idListFilter.setIds(QList<QContactId>() << exampleContact.id());
     m_contactFetchRequest.setManager(m_manager);
     m_contactFetchRequest.setFilter(idListFilter);
     m_contactFetchRequest.start();

The synchronous API provides a function specifically for this purpose:

     QContact existing = m_manager.contact(exampleContact.id());

Updating an existing contact in a manager

The client updates a previously saved contact by saving the updated version of the contact. Any contact whose id is the same as that of the updated contact will be overwritten as a result of the save request.

     phoneNumberDetail.setNumber("+123 9876");
     exampleContact.saveDetail(&phoneNumberDetail);
     m_contactSaveRequest.setManager(m_manager);
     m_contactSaveRequest.setContacts(QList<QContact>() << exampleContact);
     m_contactSaveRequest.start();

The equivalent code using the synchronous API looks like:

     phoneNumberDetail.setNumber("+123 9876");
     exampleContact.saveDetail(&phoneNumberDetail);
     m_manager.saveContact(&exampleContact);

Removing a contact from a manager

The client removes a contact from the manager by specifying its id.

     connect(&m_contactRemoveRequest, SIGNAL(stateChanged(QContactAbstractRequest::State)), this, SLOT(contactRemoveRequestStateChanged(QContactAbstractRequest::State)));
     m_contactRemoveRequest.setManager(m_manager);
     m_contactRemoveRequest.setContactIds(QList<QContactId>() << exampleContact.id());
     m_contactRemoveRequest.start();

The equivalent code using the synchronous API looks like:

     m_manager.removeContact(exampleContact.id());

Creating a new relationship between two contacts

The client specifies a relationship between two contacts stored in the manager

     // first, create the group and the group member
     QContact exampleGroup;
     exampleGroup.setType(QContactType::TypeGroup);
     QContactNickname groupName;
     groupName.setNickname("Example Group");
     exampleGroup.saveDetail(&groupName);

     QContact exampleGroupMember;
     QContactName groupMemberName;
     groupMemberName.setFirstName("Member");
     exampleGroupMember.saveDetail(&groupMemberName);

     // second, save those contacts in the manager
     QList<QContact> saveList;
     saveList << exampleGroup << exampleGroupMember;
     m_contactSaveRequest.setContacts(saveList);
     m_contactSaveRequest.start();
     m_contactSaveRequest.waitForFinished();

     // third, create the relationship between those contacts
     QContactRelationship groupRelationship;
     groupRelationship.setFirst(exampleGroup.id());
     groupRelationship.setRelationshipType(QContactRelationship::HasMember);
     groupRelationship.setSecond(exampleGroupMember.id());

     // finally, save the relationship in the manager
     connect(&m_relationshipSaveRequest, SIGNAL(stateChanged(QContactAbstractRequest::State)), this, SLOT(relationshipSaveRequestStateChanged(QContactAbstractRequest::State)));
     m_relationshipSaveRequest.setManager(m_manager);
     m_relationshipSaveRequest.setRelationships(QList<QContactRelationship>() << groupRelationship);
     m_relationshipSaveRequest.start();

The equivalent code using the synchronous API looks like:

     // first, create the group and the group member
     QContact exampleGroup;
     exampleGroup.setType(QContactType::TypeGroup);
     QContactNickname groupName;
     groupName.setNickname("Example Group");
     exampleGroup.saveDetail(&groupName);

     QContact exampleGroupMember;
     QContactName groupMemberName;
     groupMemberName.setFirstName("Member");
     exampleGroupMember.saveDetail(&groupMemberName);

     // second, save those contacts in the manager
     QMap<int, QContactManager::Error> errorMap;
     QList<QContact> saveList;
     saveList << exampleGroup << exampleGroupMember;
     m_manager.saveContacts(&saveList, &errorMap);

     // third, create the relationship between those contacts
     QContactRelationship groupRelationship;
     groupRelationship.setFirst(exampleGroup.id());
     groupRelationship.setRelationshipType(QContactRelationship::HasMember);
     groupRelationship.setSecond(exampleGroupMember.id());

     // finally, save the relationship in the manager
     m_manager.saveRelationship(&groupRelationship);

Retrieving relationships between contacts

The client requests the relationships that a particular contact is involved in from the manager in which the contact is stored.

     connect(&m_relationshipFetchRequest, SIGNAL(stateChanged(QContactAbstractRequest::State)), this, SLOT(relationshipFetchRequestStateChanged(QContactAbstractRequest::State)));
     m_relationshipFetchRequest.setManager(m_manager);
     // retrieve the list of relationships between the example group contact and the example member contact
     // where the group contact is the first contact in the relationship, and the member contact is the
     // second contact in the relationship.  In order to fetch all relationships between them, another
     // relationship fetch must be performed with their roles reversed, and the results added together.
     m_relationshipFetchRequest.setFirst(exampleGroup.id());
     m_relationshipFetchRequest.setSecond(exampleGroupMember.id());
     m_relationshipFetchRequest.start();

The equivalent code using the synchronous API looks like:

     QList<QContactRelationship> groupRelationships = m_manager.relationships(QContactRelationship::HasMember, exampleGroup.id(), QContactRelationship::First);
     QList<QContactRelationship> result;
     for (int i = 0; i < groupRelationships.size(); i++) {
         if (groupRelationships.at(i).second() == exampleGroupMember.id()) {
             result.append(groupRelationships.at(i));
         }
     }

When a contact is retrieved, it will contain a cache of the relationships in which it is involved at the point in time at which it was retrieved. This provides clients with a simple way to retrieve the relationships in which a contact is involved, but carries the risk that the cache is stale.

     exampleGroup = m_manager.contact(exampleGroup.id()); // refresh the group contact
     groupRelationships = exampleGroup.relationships(QContactRelationship::HasMember);
     for (int i = 0; i < groupRelationships.size(); i++) {
         if (groupRelationships.at(i).second() == exampleGroupMember.id()) {
             result.append(groupRelationships.at(i));
         }
     }

Clients can inform the manager that they do not require this cache of relationships to be populated when retrieving a contact, which can allow a manager to optimize contact retrieval. Other retrieval optimizations are also possible to specify, for example that they do not require action preferences to be returned, or that they are only interested in certain types of details. The following code shows how the client can inform the manager that they are only interested in relationships of the HasMember type (groups):

     QContactFetchHint hasMemberRelationshipsOnly;
     hasMemberRelationshipsOnly.setRelationshipTypesHint(QStringList(QContactRelationship::HasMember));

     m_contactFetchRequest.setManager(m_manager);
     m_contactFetchRequest.setFilter(QContactFilter()); // all contacts
     m_contactFetchRequest.setFetchHint(hasMemberRelationshipsOnly);
     m_contactFetchRequest.start();

The equivalent code using the synchronous API looks like:

     QContactFetchHint hasMemberRelationshipsOnly;
     hasMemberRelationshipsOnly.setRelationshipTypesHint(QStringList(QContactRelationship::HasMember));

     // retrieve all contacts, with no specified sort order, requesting that
     // HasMember relationships be included in the cache of result contacts
     QList<QContact> allContacts = m_manager.contacts(QContactFilter(), QList<QContactSortOrder>(), hasMemberRelationshipsOnly);

Removing a relationship between two contacts

The client can remove a relationship directly from a manager.

     connect(&m_relationshipRemoveRequest, SIGNAL(stateChanged(QContactAbstractRequest::State)), this, SLOT(relationshipRemoveRequestStateChanged(QContactAbstractRequest::State)));
     m_relationshipRemoveRequest.setManager(m_manager);
     m_relationshipRemoveRequest.setRelationships(QList<QContactRelationship>() << groupRelationship);
     m_relationshipRemoveRequest.start();

The equivalent code using the synchronous API looks like:

     m_manager.removeRelationship(groupRelationship);

Alternatively, when a contact which is involved in a relationship is removed, any relationships in which it is involved will be removed also.

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