qrcodeencoder c# Enabling Printing and Faxing in C#

Generator QR-Code in C# Enabling Printing and Faxing

Enabling Printing and Faxing
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Printing Processes
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The printing process is divided into three phases:
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Client processes Spooler processes Printer processes
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These groups of steps include the following specific actions, shown in Figure 11-2.
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User sends print job. Printer Driver Winspool.drv Spoolsv.exe Spoolss.dll Local Print Provider LPP polls print provider. Print provider modifies as needed. Print separator added as needed.
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Language monitor if device is bidirectional.
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Port monitor if device is unidirectional.
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Print Device
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Figure 11-2
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Printing process
The steps depicted in Figure 11-2 include the client, spooler, and printer processes.
Part II:
Desktop Management
Client Processes
The client processes include:
A user sends a print job from an application. The application calls the Graphics Device Interface (GDI). The GDI calls the printer driver for information, which the GDI uses to create a job in printer language. The GDI delivers the job to the spooler.
Spooler Processes
The spooler processes include:
The client side of the spooler (Winspool.drv) makes a remote procedure call (RPC) to the server side spooler (Spoolsv.exe). Spoolsv.exe calls the print router (Spoolss.dll). The router (Localspl.dll) sends the print job to the local print provider (LPP) or the remote print server if the job is being sent to a network printer. The LPP polls the print processors to find one that can handle the data type of the job. The LPP sends the job to the print processor, which modifies the job as required to make it print properly. The print processor sends the job to the page separator. A separator page is added if required. The job is sent to the appropriate port print monitor. If print is bidirectional, the job is first sent to a language monitor, such as the Printer Job Language (PJL) monitor, and then sent on to the port monitor. If the job is unidirectional, the job is sent directly to the port monitor.
Printer Processes
The printer processes include:
The printer receives the print job from the print spooler. The printer translates the print language into a bitmap, which it then prints.
Printer Components
Many components work together to make the printing process possible. Different components are used at different times, depending on the type of print job being produced and the types of hardware being used.
11:
Enabling Printing and Faxing
Graphics Device Interface
The application calls the Graphics Device Interface (GDI) to begin the process of creating a print job. The GDI reads the driver information for the printer to get information about how to format the job. Using the document information from the application and the print device information from the printer driver, the GDI renders the print job in a language that the printer reads.
Printer Drivers
Printer drivers contain information that is specific to the printer that is used. Printer drivers reside on users computers and are used by the GDI to render print jobs. Windows XP Professional includes the most common printer drivers, but you might need to provide third-party printer drivers for some printers. When a Windows XP Professional user connects to a printer or installs a Plug and Play printer, the necessary printer drivers are loaded onto the user s computer if they are available in Windows XP Professional.
Print Spooler
The print spooler consists of a group of components that include the print router, the local and remote print provider, the print processor, and the language and port monitors. These components can reside on both the computer sending a job and the network print server receiving print jobs. The print spooler s components take the print job that the GDI creates, and then modify it so that it has all the required information and formatting to print correctly. If part of the spooler is on a server, the server provides the processing resources for the print job, freeing the user s computer and improving performance. Different print servers have different spooler components. In Windows 2000 Server and Windows Server 2003, the print spooler is made up of a router, remote print provider, local print provider, print processor, separator page processor, and language and port monitors. Print router The print router receives a print job and locates an available print provider that can handle the print job s protocol. For example, the router might look for a print provider designed to handle RPC print jobs or jobs that were transferred by using HTTP. When an acceptable print provider is found, the router relays the print job from the remote print provider to the chosen local print provider, where the job is modified as needed before printing. Remote print provider The remote print provider is part of the client side of the print process. The router gives control of the print job to the first remote print provider the router finds that recognizes the destination printer. A remote print provider sends the print job to the server router only.
Part II:
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