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Running Script Files
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Windows XP provides two scripting hosts. The Windows based version runs scripts when you double click a script file. The script engine is Wscript.exe. You can also use the command line version, which is handy when the script outputs data similar to how most command line programs do. The example given in the sidebar "Why write scripts when INF files are easier " in Listing 9 7 is one script that's better from the command line. The command line scripting engine is Cscript.exe:
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cscript script [//B|//I] [//D] [//E: engine] [//H:cscript|//H:wscript] [//
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Job:name] [//Logo|//Nologo] [//S] [//T:time] [//X] [// ]
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This specifies batch mode, which does not display alerts, scripting errors, or input prompts. //I This specifies interactive mode, which displays alerts, scripting errors, and input prompts. This is the default and the opposite of //B. //D This turns on the debugger. //E: engine Specifies the scripting language that is used to run the script. //H:cscript | This registers either Cscript.exe or Wscript.exe as the default script host for //H:wscript running scripts. If neither is specified, the default is Wscript.exe. //Job: name This runs the job identified by name in a .wsf script file. //Logo This specifies that the Windows Script Host banner is displayed in the console window before the script runs. This is the default and the opposite of //Nologo. //Nologo This specifies that the Windows Script Host banner is not displayed before the script runs. //S This saves the current command line options for the current user. //T: time This specifies the maximum time the script can run (in seconds). You can specify up to 32,767 seconds. The default is no time limit. //X This starts the script in the debugger. // This displays available command parameters and provides help for using them. (This is the same as typing Cscript.exe with no parameters and no script.) You can specify some of the same options when using the Windows based scripting host. Right click the script file, and then click Properties. You'll see the dialog box shown in Figure 9 3 on the next page. You can set the amount of time that the script is allowed to run and whether or not the host displays a log. The result is a file with the .wsh extension that contains these settings. It looks like your average INI file. You then execute the script by double clicking the WSH file.
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Figure 9 3: You create a WSH file, which contains a script file's settings, by right clicking the script, clicking Properties, and then clicking the Script tab.
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Formatting Key and Value Names
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Before I show you how to edit the registry with a script, there's one more detail: how to format the names of keys and values in a script. Unlike other scripting methods I've described in this chapter, the Windows Script Host object model doesn't have separate parameters for the key and value name. Thus, you distinguish key names and value names by how you format them. The rule is simple: If a string ends with a backslash, it's a key name; if a string doesn't end with a backslash, it's a value name. Also, the JScript language reserves the backslash character (\) as the escape character: \n is a newline character and \t is a tab, for example. That means that you must escape the backslashes in your keys. Thus, any time you have a backslash in a key, you must use two backslashes (\\). To keep these clear, see Table 9 4. Table 9 4: Key and Value Formatting 217
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Object VBScript JScript Value "HKLM\Subkey\Value" "HKLM\\Subkey\\Value" Key "HKLM\Subkey\" "HKLM\\Subkey\\"
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Adding and Updating Values
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The Shell object's RegWrite method adds keys and values or changes existing values. If you want to change a key's default value, set strName to the name of the key, including the trailing backslash, and then assign a value to it. Tip One of the RegWrite method's biggest weaknesses is that it writes only four bytes of REG_BINARY values. It can't handle larger binary values. If you want to change longer binary values or change types of values that this method doesn't support, use the Shell object's Run method to import a REG file. For example, you can put your settings in a REG file called Settings.reg. Then import that REG file using the statement WshShell.Run("Settings.reg").
object.RegWrite( strName, anyValue [,strType] )
object This is the Shell object. strName This is the string indicating the name of the key or value. You can add keys. You can add or change values. strName must be a fully qualified path to a key or value and begin with one of the root keys: HKCR, HKCU, HKLM, or HKU. anyValue This is the data to assign to new or existing values. Use the format appropriate for the value's type. strType This is the type of value to create: REG_SZ, REG_EXPAND_SZ, REG_DWORD, or REG_BINARY. The RegWrite method doesn't support the REG_MULTI_SZ value type. Also, this method writes only four byte REG_BINARY values. Example (VBScript)
Set WshShell = WScript.CreateObject("WScript.Shell") WshShell.RegWrite "HKCU\Software\Sample\", 1, "REG_BINARY" WshShell.RegWrite "HKCU\Software\Sample\Howdy", "World!", "REG_SZ"
Example (JScript)
var WshShell = WScript.CreateObject( "WScript.Shell" ); WshShell.RegWrite("HKCU\\Software\\Sample\\", 1, "REG_BINARY"); WshShell.RegWrite("HKCU\\Software\\Sample\\Howdy", "World!", "REG_SZ");
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