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- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *ControlRowIdentifier = @"ControlRowIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ControlRowIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ControlRowIdentifier] autorelease]; UIImage *buttonUpImage = [UIImage imageNamed:@"button_up.png"]; UIImage *buttonDownImage = [UIImage imageNamed:@"button_down.png"]; UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(0.0, 0.0, buttonUpImage.size.width, buttonUpImage.size.height); [button setBackgroundImage:buttonUpImage forState:UIControlStateNormal]; [button setBackgroundImage:buttonDownImage forState:UIControlStateHighlighted]; [button setTitle:@"Tap" forState:UIControlStateNormal]; [button addTarget:self action:@selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside]; cell.accessoryView = button; } NSUInteger row = [indexPath row]; NSString *rowTitle = [list objectAtIndex:row]; cell.textLabel.text = rowTitle; return cell; } #pragma mark #pragma mark Table Delegate Methods - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; NSString *rowTitle = [list objectAtIndex:row]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"You tapped the row." message:[NSString stringWithFormat:@"You tapped %@.", rowTitle] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release];

Let s look first at our new action method. The first thing we do is declare a new UIButton instance and set it to sender. This is just so we don t have to cast sender multiple times throughout our method:

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Once you have configured database mirroring, you can set up warning thresholds that will trigger performance threshold events that are written to the Windows Event Log whenever the threshold you have defined has been exceeded You can then configure alerts to fire based on the error numbers for these events, so SQL Server can notify you if a certain threshold is exceeded SQL Server only evaluates these thresholds whenever a new value is written to the database mirroring status table Since the Database Mirroring Monitor Job automatically updates the database mirroring status table, you want to make sure SQL Server Agent is running and the Database Mirroring Monitor Job is running frequently enough to meet your monitoring and alerting needs The following is a list of warning thresholds you can configure along with their respective error numbers.

Microsoft developed COM to enable applications to interact with each other and to promote reusability. COM is the set of specifications that, when followed, allows software components to communicate with each other. Each component exposes its functionality through an interface and is uniquely identified by global unique identifiers (GUIDs). The advantage of using COM is that different components developed in different languages can write these software components and interact with each other by using IUnknown and other standard COM interfaces. Most of Microsoft s products, including Microsoft Office, SQL Server, and even Windows, are based on COM. Though COM provides the ability to reuse the components locally, it was not designed to work well with remote components. Few specifications and extensions had been made that were based on COM and that interacted with remote components. However, the need for remote method invocations grew substantially. To solve this concern, Microsoft developed DCOM. This essentially is a combination of COM and the network protocol that allows you to run a COM object on a remote computer. DCOM was a proprietary wire-protocol standard from Microsoft to extend COM so it could work in distributed environments. DCOM provides an opportunity to distribute your component across different locations according to the application requirements. In addition, DCOM provides basic infrastructure support such as reliability, security, location independence, and efficient communication between COM objects that are residing across processes and machines.

UIButton *senderButton = (UIButton *)sender;

Next, we get the button s superview, which is the table view cell for the row it s in, and we use that to determine the row that was pressed and to retrieve the title for that row:

s Covering DCOM and COM in more detail is beyond the scope of this book, but if you want to delve into Tip

UITableViewCell *buttonCell = (UITableViewCell *)[senderButton superview]; NSUInteger buttonRow = [[self.tableView indexPathForCell:buttonCell] row]; NSString *buttonTitle = [list objectAtIndex:buttonRow];

Then we show an alert, telling the user that they pressed the button:

Up to now, we ve focused on solutions that need to leverage existing legacy application logic that is hosted in COM+. We ve focused primarily on Visual Basic 6 given its distinct ability to hide some things that you need control over in order to fully leverage and reuse your application logic. This section approaches the problem scenario from the perspective that these legacy solutions are not stagnant. In fact, it has been estimated that nearly 90 percent9 of IT budgets are focused on maintaining and extending existing solutions many of those built on Visual Basic 6 and other legacy technologies.

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"You tapped the button" message:[NSString stringWithFormat: @"You tapped the button for %@", buttonTitle] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release];

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