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class is the call method Every request that comes into Rack will invoke a call and pass in the env variable The env variable consists of the regular CGI environment variables that hold information about the request Those variables can be accessed through the env hash, but it s easier to work with the Rack Request wrapper than the environment variables directly Request takes the env variables and wraps them in a friendlier interface The rest of the call method is a series of statements that determine which request is being made to the API To make things a little more readable, the implementation of each API entry point is its own method This means that the entire body of call methods is devoted to resolving a request to a Ruby method The implementations of these methods are almost identical to the implementations in the Sinatra example In normal circumstances, you probably wouldn t want to write Rack code like this The code inside the call method highlights some of the common things you want out of a service framework: mapping a request URI and HTTP method to a Ruby method (like routes in Rails) and pulling out values from the request path and query string A more advanced service interface might route based not only on URI and HTTP method but on headers as well For example, if you were using headers to specify the API version, it would be helpful to route based on that information The raw Rack implementation shows what common elements Sinatra and Rails provide

Do you want to proceed (Y or N) y The computer needs to be restarted in order to complete the operation The command completed successfully

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The basic unit of printing in WinForms is the print document A print document describes the characteristics of what's to be printed, such as the title of the document, and provides the events at various parts of the printing process, such as when it's time to print a page NET models the print document using the PrintDocument component from the SystemDrawing Printing namespace (and available on the VSNET Toolbox): class PrintDocument : Component, IComponent, IDisposable { // Constructors public PrintDocument(); // Properties public PageSettings DefaultPageSettings { get; set; } public string DocumentName { get; set; } public PrintController PrintController { get; set; } public PrinterSettings PrinterSettings { get; set; } // Events public event public event public event public event PrintEventHandler BeginPrint; PrintEventHandler EndPrint; PrintPageEventHandler PrintPage; QueryPageSettingsEventHandler QueryPageSettings;

This change does not take immediate effect; a reboot is required by selecting the Restart option from the Ctrl+Alt+Del screen shutdown options as shown in Figure 14-6 or by using the shutdown /r /t 0 command When the reboot is complete, the server has taken the new name, which you can verify by rerunning the hostname command

FIGURE 14-6 Although you don t have a Start menu, access shutdown options via the Ctrl+Alt+Del menu

By default, the new installation has been dynamically allocated an IP address However, in most cases a server needs static IPv4 information, which can be seen with the ipcon g /all command It will show DHCP Enabled set to Yes Because you can t use the normal Network interface to set the IP properties, instead use the netsh command However, before you can set the

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// Methods public void Print(); } The basic usage of a PrintDocument object is to create an instance, subscribe to at least the PrintPage event, call the Print method, and handle the PrintPage event: PrintDocument printDocument1; void InitializeComponent() { thisprintDocument1 = new PrintDocument(); thisprintDocument1PrintPage += new PrintPageEventHandler(thisprintDocument1_PrintPage); } void printButton_Click(object sender, SystemEventArgs e) { printDocument1DocumentName = fileName; printDocument1Print(); } void printDocument1_PrintPage(object sender, PrintPageEventArgs e) { // Draw to the printer Graphics g = eGraphics; using( Font font = new Font("Lucida Console", 72) ) { gDrawString("Hello,\nPrinter", font, ); } } The PrintPage event is triggered by a call to the PrintDocument object's Print method The PrintPage event is responsible for actually rendering the state of the document to the printer

IP properties, check which interface you are con guring By default your server has two network interfaces: the real physical interface and a second IntraSite Automatic Tunnel Addressing Protocol (ISATAP) tunneling interface, which sends IPv6 packets over an IPv4 network by encapsulating the IPv6 packet in the IPv4 header You need to con gure the physical connection and not the ISATAP one, so list your interfaces to identify the index of the physical adapter

This chapter takes a quick tour of a few of the options for implementing services in Ruby However, it only scratches the surface There are many frameworks out there, including Wave, Mack, and several others However, the three options reviewed in this chapter give a good idea of different ways for structuring the code for a service While Rails is probably the most familiar option, it includes extra code and scaffolding that are unnecessary Sinatra provides a simple, clean interface for mapping requests to blocks of code for their implementation The common element among most frameworks is Rack However, while you can write a raw Rack-based service, its implementation is quite messy Ultimately, the choice of which framework to use comes down to aesthetics Most frameworks can accomplish the job While requests may run a little more slowly through the Rails framework, the service application layer is horizontally scalable However, services should strive for simplicity This means keeping the amount of code to a minimum and striving for readability and maintainability throughout

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