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Deleting a contact is simply a matter of nding the contact identi er and constructing the appropriate PDU. Again, we check for the smartphone having disconnected while the dialog is raised using the mLostPhone member.
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private void DeleteButton_Click(object sender, System.EventArgs e) { if(ContactList.SelectedIndices.Count <= 0) { return; } mLostPhone = false; int delIndex = ContactList.SelectedIndices[0]; RCNTContact delContact = (RCNTContact)ContactList. Items[delIndex].Tag; if ((MessageBox.Show ("Are you sure you want to delete this contact ", "Confirm Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2 ) == DialogResult.Yes) && !mLostPhone) { RCNTUtils.WriteDeleteContact(mStream, ref mNextMessageId, delContact.mId); StatusBox.Text = "Deleting contact - please wait"; mPendingRead = true; mReadingLength = true; mStream.Read(4); ContactList.Items.RemoveAt(delIndex); } SetButtonStates(); }
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As with some of the earlier actions, we will need to extend ServiceRead() for the reply when we edit or delete contacts, but we are not concerned with the contents of the PDU. We can create a new contact using the edit form.
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private void CreateButton_Click(object sender, System.EventArgs e) { mLostPhone = false; RCNTUtils.CreateNewContact(ref mTemplateFields, out mPendingCreateContact); ContactEditForm editForm = new ContactEditForm (ref mPendingCreateContact); if(editForm.ShowDialog()== DialogResult.OK) { // Check for some fields changed bool newData = false; for(int fi = 0 ; fi < mPendingCreateContact.mFields.Count ; fi++) { RCNTField field = (RCNTField)mPendingCreateContact.mFields[fi]; if(field.mChanged) { newData = true;
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break; } } if(newData && !mLostPhone) { // Save the new contact RCNTUtils.WriteCreateContact(mStream, ref mNextMessageId, ref mPendingCreateContact); StatusBox.Text = "Creating new contact - please wait"; mPendingRead = true; mReadingLength = true; mStream.Read(4); }// endif got new data }// endif OK from create form SetButtonStates(); }
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We can create a new contact object using the template elds.
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// Creates a new contact based on template fields static public void CreateNewContact(ref ArrayList aTemplateFields, out RCNTContact aContact) { aContact = new RCNTContact(); aContact.mId = 0; aContact.mFields = new ArrayList(aTemplateFields); }
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Once again, we choose to send data only for elds containing some data.
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/// Create a contact public static void WriteCreateContact ( BALApplicationAsyncStream aStream, ref int aNextPDUId, ref RCNTContact aContact ) { ArrayList message = new ArrayList(); ConnPack.WriteInt32(ERCntCmdCreateContact, ref message); ConnPack.WriteInt32(aNextPDUId, ref message); for(int i = 0 ; i < aContact.mFields.Count ; i++) { RCNTField field = (RCNTField)aContact.mFields[i]; if(field.mChanged) { for(int fi = 0 ; fi < field.mFieldType.Count ; fi++) { ConnPack.WriteInt32((int)field.mFieldType[fi], ref message); } ConnPack.WriteInt32(-1, ref message); ConnPack.WriteInt32(field.mMapping, ref message); ConnPack.WriteUNCData(field.mFieldText, ref message); } } ConnPack.WriteInt32(-1, ref message);
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aNextPDUId++; aStream.Write(ConnPack.AsByteArr(ref message)); }
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At this point we have a contacts application that allows the user to browse through their contacts and to edit or delete existing contacts or to create new ones. It does not make any use of the nd methods and it has no explicit integration with any other application. If you were building a combined application then you would almost certainly choose to integrate more.
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Our nal application to consider at this point is an Agenda application. There is a lot of scope for good or clever GUI design (the two are not always the same) to present the Agenda information in ways that are helpful to the user. For example, Agenda applications may have year, month, week or day views, and they may choose various ways to show free time or days when appointments are booked. In this application, I have chosen to display only one day of information at a time, and the Agenda Connectivity service was written with this in mind. If you want to display other views then you should consider extending the service on the Symbian OS smartphone to retrieve more than one day s data at a time; creating a year view one day at a time would have serious performance problems. When the Contacts application obtained a connection, it sent some commands to set the view and retrieve template information. In a similar way, we will open the calendar le for our Agenda application. We saw that the Agenda Model, unlike the Calendar Model, requires us to explicitly specify the name of the calendar le. Unfortunately, different models of Symbian OS smartphone use different locations and names for their calendar le. Therefore, we need to choose the le name based on the phone manufacturer and model. In my example I have handled only two manufacturers and I have speci ed the models that I have tested this software with. It would be possible to be more relaxed and try different locations or names as the service responds with an error number if the calendar le is not found, this would be manageable. I could have put the code to select the le name in the service on the phone, but it is easier to upgrade PC software. By devolving the choice of name to the PC application, I provide the ability to support new devices at a later date simply by releasing an upgrade to the PC side. If I wanted to be really clever, I could put the data about which manufacturers and models have which named calendar le into the registry, and then supporting new phones would require simply releasing a registry upgrade le.
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