c# qr code encoder Part 3: Customizing Windows in Visual C#

Generate QR Code in Visual C# Part 3: Customizing Windows

Part 3: Customizing Windows
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Microsoft Windows XP Inside Out, Second Edition
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30 reg export "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ MenuOrder\Favorites" "%AppData%\Inside Out\Favorites.reg" > nul 31 reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ MenuOrder\Favorites" /f > nul 32 if %errorlevel% equ 0 echo Favorites alphabetized. 33 34 :SORTSTARTMENU 35 if not %startmenu% == true goto :eof 36 reg export "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ MenuOrder\Start Menu" "%AppData%\Inside Out\Start Menu.reg" > nul 37 reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ MenuOrder\Start Menu" /f > nul 38 if %errorlevel% equ 0 echo Start Menu alphabetized. 39 goto :eof 40 41 :UNDO 42 :UNDOFAVORITES 43 if not %favorites% == true goto undostartmenu 44 if not exist "%appdata%\inside out\favorites.reg" goto noundofile 45 reg import "%appdata%\inside out\favorites.reg" > nul 46 echo Favorites order restored. 47 48 :UNDOSTARTMENU 49 if not %startmenu% == true goto :eof 50 if not exist "%appdata%\inside out\start menu.reg" goto noundofile 51 reg import "%appdata%\inside out\start menu.reg" > nul 52 echo Start menu order restored. 53 goto :eof 54 55 :NOUNDOFILE 56 echo No file exists to restore. 57 goto :eof 58 59 :USAGE 60 echo. 61 echo Usage: 62 echo Alphabetize StartMenu^|Favorites^|Both [Undo] 63 echo. 64 echo Example: 65 echo Alphabetize Favorites 66 echo. 67 echo Add Undo to restore previous settings.
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15
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Lines 1 through 3 take care of some basic setup functions. They identify what this batch program does and turn echoing off. The Setlocal command specifies that environment variables created or changed by this batch program should be local to this batch program and should not affect other programs. Line 4 creates a folder under the Application Data folder called Inside Out. Because the Md (make directory) command displays an error if the folder already exists, we use If Not Exist so that the Md command is executed only if the folder does not exist.
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Part 3: Customizing Windows
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Automating Windows XP The second section of the batch program, lines 6 through 11, checks for command-line parameters. The %1 that appears in several of these lines represents the first argument on the command line, %2 represents the second, and so on up to %9. If you type the command alphabetize a, for example, the command interpreter sees this as the first line in this section of the batch program:
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if "a" == "" goto usage
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Using Local Environment Variables
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In many cases, a batch program needs to change a standard environment variable, such as Path. But changing this critical variable without restoring it when you are finished could cause problems for other programs. If you re writing the batch program for your own use, it s not difficult to restore modified variables, although it gets tiresome after awhile. But if you re writing a batch program to be run by others, you probably won t even know what settings to restore. Windows XP addresses this problem with the Setlocal and Endlocal commands. Setlocal makes any further settings or changes to environment variables local to the current batch program. Endlocal returns handling of environment variables back to normal mode any further changes remain after the batch program terminates. You might want to use a batch program to modify environment variables for either of two reasons. First, this might be the primary purpose of the batch program, as it is in the following short batch program (call it Addpath.bat), which adds a folder to the end of the search path:
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@echo off set path=%path%;%1
But more often, you will use environment variables to save values or change program behavior within the batch program. The simple rule is to use Setlocal at the start of the batch program and Endlocal at the end. Even if your batch program sets only a temporary environment variable, you want to be sure that the variable is cleared on termination. For example:
setlocal rem Set new path set path=d:\bin rem Do something with the new path . . endlocal rem Path goes back to its original value after EndLocal
The test for equality would not be True, so the Goto statement would not be executed. But if you type alphabetize (without any arguments), the command interpreter would see
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