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In this script, you can see that the Label control gets assigned to the <span> element by using the ID attribute and pointing it at the name of the <span> element, which in this case is sampleLabel. Next you set up the <discreteAnimation> control by pointing it at the text property of the <sampleLabel> control using the property and target attributes, respectively. The important property here to understand is the values property. You set this to a commaseparated list of the desired values, enclosed within a string. In this case, it is the full alphabet, but it can be anything; for example, to animate through the names Andrew, Bob and Claire, you would set it to the following: " 'Andrew', 'Bob', 'Claire' " The duration attribute specifies the time in seconds that it should take to cycle through the defined values. Finally, a Button control points at the underlying <input> control that renders a button in HTML. It has an invoke method behavior associated with its click action that triggers the play method of the animation. Thus, clicking the button starts the animation and the behavior exhibited in Figures 9-13 to 9-15.

If Local_NumberReturned > 0 Then Return True Else Return False End If Local_Comm.Dispose() End If Catch newexception As SqlException Throw newexception Finally Local_Conn.Close() Local_Conn.Dispose() Local_Comm.Dispose() End Try End Function There will also be times that a single string value needs to be returned from a stored procedure (that is, return the e-mail address of the supervisor). Add the following function to execute a stored procedure and return just a single string value: Private Function ReturnSingleStringSP(ByVal SPName As String) As String Dim Local_StringReturned As String Try If Not Local_Conn.State = ConnectionState.Open Then Local_Conn.ConnectionString = My.Settings.ConnString Local_Conn.Open() Local_Comm.CommandText = SPName Local_Comm.CommandType = CommandType.StoredProcedure Local_Comm.Connection = Local_Conn Local_StringReturned = CStr(Local_Comm.ExecuteScalar) If Not IsDBNull(Local_StringReturned) Then Return Local_StringReturned Else Return String.Empty End If Local_Comm.Dispose() End If Catch newexception As SqlException Throw newexception Finally Local_Conn.Close() Local_Conn.Dispose() Local_Comm.Parameters.Clear() Local_Comm.Dispose() End Try End Function

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second constructor arguments tell the QUrl class to be tolerant. The alternative to being tolerant is strict, and this mode is set by passing the QUrl::StrictMode value to the constructor. The tolerant mode compensates for common mistakes encountered in URLs entered by users.

Figure 14-4. The HttpDialog as shown to the user If the URL is found to be invalid, the QLabel widgets used to show the different parts of the URL are set to show no text. Then a dialog is shown before the method is left. If a valid URL has been entered, the QLabel widgets are updated with the URL sections. When updating the labels, the port property gets special treatment. If the user hasn t specified a port, the port property is set to -1, which means that the user wants to use the default port for HTTP communications: port 80. Listing 14-12. Parsing the URL and splitting it into its individual parts void HttpDialog::getClicked() { QUrl url( ui.requestEdit->text(), QUrl::TolerantMode ); if( !url.isValid() ) { ui.hostLabel->clear(); ui.pathLabel->clear(); ui.portLabel->clear(); ui.userLabel->clear(); ui.passwordLabel->clear();

Summary

QMessageBox::warning( this, tr("Invalid URL"), tr("The URL '%1' is invalid.").arg( ui.requestEdit->text() ) ); return; } ui.hostLabel->setText( url.host() ); ui.pathLabel->setText( url.path() ); ui.portLabel->setText( QString::number(url.port()==-1 80 : url.port()) ); ui.userLabel->setText( url.userName() ); ui.passwordLabel->setText( url.password() ); ... The source code from Listing 14-12 is a part of the HttpDialog class shown in Listing 14-13. The dialog is used by the user to download files using HTTP The user enters a URL in the . text field at the top and clicks the Get button. The button is connected to the getClicked slot shown previously. When the URL has been validated, it is used to download the file to which it points. While the file is being downloaded, the signals emitted from the QHttp object are listed in the list widget at the bottom of the dialog. Each of the slots starting with http is used for listening to the different signals that the QHttp object emits while working. The user interface itself has been created in Designer and is included as the ui member variable. Finally, a QFile pointer and QHttp object are used when downloading data. Listing 14-13. The HttpDialog class declaration class HttpDialog : public QDialog { Q_OBJECT public: HttpDialog(); private slots: void getClicked(); void void void void void void void void httpStateChanged(int); httpDataSent(int,int); httpDataReceived(int,int); httpHeaderDone(const QHttpResponseHeader&); httpDataDone(const QHttpResponseHeader&); httpStarted(int); httpFinished(int,bool); httpDone(bool);

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