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ExternalDataEventArgs) Try Local_Conn = New SqlConnection Local_Comm = New SqlCommand AddInputParameter("@IntReviewID", IntReviewID) If ExecuteNonQuerySP("usp_ReviewToSupervisor") Then AddInputParameter("@IntReviewID", IntReviewID) StrEmailAddress = ReturnSingleStringSP("usp_RetrieveSupervisorEmailAddress") End If Catch ex As Exception End Try End Sub The first two lines of this code declare new instances of the SQLConnection and SQLCommand objects Next, a parameter is added for the review ID to the Command object Then a call is made to ExecuteNonQuerySP, which then executes the stored procedure called usp_ReviewToSupervisor This stored procedure changes the current approver of the review denoted by IntReviewID to be the supervisor of the employee the review is for If that update is successful (it affects at least one row), then a new parameter is added to the Command object (note at the end of each sub or function, the Parameters collection is cleared).

Number animations are similar to length animations but don t append the text to the end and instead offer the facility to use fractional values. In this case, you can animate through a range of values that aren t limited to whole numbers. Discrete animations also allow you to change the value of a control s property automatically through a predefined range. You could, for example, automatically cycle the contents of a text field through the values a through z by specifying these as a list to a property on the animation and then triggering that animation. From this chapter you have gleaned some great new tools to make your UIs more sophisticated and easy to use for your users. In the next chapter, you will look at another value-added client-side library that Atlas gives you the Mapping library. This library allows you to instantly and easily add mapping and geocoding functionality to your applications that will update in an asynchronous, Ajax-like manner.

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The URL handling code discussed earlier was the top half of a slot called getClicked. You saw how that method was connected to the user interface in the preceding constructor. When you left the getClicked method in Listing 14-12, the URL had just been validated and split into its building blocks. When you continue in Listing 14-15, you use the URL to set the host property of the QHttp object. Call setHost and specify the hostname and port. Just as when displaying the port, port 80 is the default if nothing else has been specified. If a username was specified, it is set, along with its password, with the setUser method. When the QHttp object has been set up, continue by asking the user for a file name for storing the downloaded material by using the QFileDialog class static method getSaveFileName. If the user cancels the dialog, return from the slot; otherwise, continue by attempting to open the file for writing. If that fails, inform the user by displaying a warning dialog and delete the QFile object. If the user picks a file name that could be used for writing, call the get(QString,QIODevice) method of the QHttp object to download the file. Finally, disable the Get button while the actual download is performed. Listing 14-15. Using the validated URL to start downloading void HttpDialog::getClicked() { ... http.setHost( url.host(), url.port()==-1 80 : url.port() ); if( !url.userName().isEmpty() ) http.setUser( url.userName(), url.password() ); QString fileName = QFileDialog::getSaveFileName( this ); if( fileName.isEmpty() ) return; file = new QFile( fileName, this ); if( !file->open( QIODevice::WriteOnly|QIODevice::Truncate ) ) { QMessageBox::warning( this, tr("Could not write"), tr("Could not open the file %f for writing.").arg( fileName ) ); delete file; file = 0; return; } http.get( url.path(), file ); ui.getButton->setEnabled( false ); }

Now the download starts; if all goes well, all you need to do is to wait for the done signal to be emitted The Boolean argument is true if an error is encountered, so you hope it will be false The signal is connected to the httpDone slot shown in Listing 14-16 If the error argument is false, close the QFile object by using the close method and delete the file object If the download operation has encountered a problem and the error argument is true, the user is warned about it before closing and removing the file and before deleting the QFile object The file is removed by using the remove method You have to remove the file because it can contain a partial download (which can occur if the connection is broken in the middle of a download operation).

erhaps it is natural that a framework called Atlas has a built-in set of libraries for handling mapping functionality! In this chapter, you will look at this functionality and how you can use and leverage it in your own applications.

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