c# qr code encoder Backing Up the Removable Storage Database in Visual C#.NET

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Backing Up the Removable Storage Database
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This batch program creates a backup copy of the Removable Storage database. It illustrates some commonly used techniques, including stopping and starting services and using environment variables. The following program is called Rsbackup.bat:
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@echo off rem Backs up the Removable Storage database title Removable Storage Backup echo Removable Storage database backup in process... echo Stopping the Removable Storage service net stop "removable storage" > nul echo Copying the Removable Storage database xcopy /y %systemroot%\system32\ntmsdata %systemroot%\system32\ntmsdata \backup\ > nul
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The available comparison operators are Equ (equal to), Neq (not equal to), Lss (less than), Leq (less than or equal to), Gtr (greater than), and Geq (greater than or equal to). You can use comparison operators only if command extensions are enabled. For information about command extensions, see Using Command Extensions, page 1192.
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Part 3: Customizing Windows
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echo Starting the Removable Storage service net start "removable storage" > nul echo. echo Removable Storage database was backed up to echo %SystemRoot%\System32\NtmsData\Backup\ title Command Prompt
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The first command to examine is Net Stop:
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net stop "removable storage" > nul
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The Net command is frequently included in batch programs because it can be used to control so many functions in Windows. In this case, we are stopping the Removable Storage service to ensure that it doesn t have the database files open when we try to copy them. To stop or start a service, you can use the service s friendly name (that is, the name that appears in the Services snap-in), as we ve done here, or you can use the actual service name if you know it. (In the case of Removable Storage, the service name is Ntmssvc.) Throughout the program, Echo statements keep the user informed of the progress. Therefore, we use > Nul to redirect the output of the Net statement to the Nul device colloquially known as the bit bucket because its output is redundant. The Xcopy command then makes a copy of the files:
xcopy /y %systemroot%\system32\ntmsdata systemroot%\system32\ntmsdata\ backup\ > nul
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On most computers, the Removable Storage database files are stored in C:\Windows\ System32\Ntmsdata. However, if you installed Windows in a different folder, the files will be in a different location. In this Xcopy statement, %SystemRoot% is an environment variable that specifies where Windows is installed on the local computer. By using environment variables, we can ensure that our batch programs work on any computer that is running Windows XP. Table 15-3 lists some useful environment variables. You can see the current environment variables for your computer by typing set at the command prompt. To use an environment variable in a batch program or at the command prompt, precede and follow its name with a percent sign (%). When the batch program executes, the value of the environment variable replaces its name in the batch program. (For more information, see Using Environment Variables, page 1201.)
Part 3: Customizing Windows
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Table 15-3.
Useful Environment Variables
Value
Location of the Application Data folder for the current user (for example, C:\Documents And Settings\CarlS\ Application Data). Location of the Common Files folder (typically C:\Program Files\Common Files). Executable file for the command processor (typically C:\Windows\System32\Cmd.exe). Drive letter that s mapped to the home folder for a user profile. By default, it s the same as the letter of the system volume (typically C). Folder for a user profile on the home drive (for example, \Documents And Settings\CarlS). Together, HomeDrive and HomePath specify the default folder for a user profile. Operating system on the user s workstation (Windows_NT on a system running Windows XP Windows 2000, or , Windows NT). Application search path. When you type the name of an executable at a command prompt, Windows looks in each folder in the search path if the executable file is not in the current folder. Location of the Program Files folder (typically C:\Program Files). Drive on which the system folder resides (typically C). System folder; the folder that contains the Windows XP operating system files (typically C:\Windows). Folder for storing temporary files (for example, C:\ Docume~1\CarlS\Locals~1\Temp the short path name for C:\Documents And Settings\CarlS\Local Settings\Temp). Domain the user is logged into (for example, SWDOCS) or, if the computer is not logged into a domain, the name of the computer (for example, SEQUOIA). User s logon name (for example, CarlS). Location of the current user s profile (for example, C:\ Documents And Settings\CarlS). Same as SystemRoot; included for compatibility with earlier versions of Windows.
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