c# qr code encoder Stepping Through Scripts in C#

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When you work in the Command window, you must use the same language as the currently running script. If you are running a VBScript file, for example, type a question mark followed by a space and the variable name to display a variable s value. If you are running a JScript file, simply enter the name of the variable. You can also view and change an object s properties in the Command window.
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Stepping Through Scripts
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When you start the debugger using the //X command-line switch, the debugger opens with the first line of the script highlighted. You can move through the script and see how the program flow works. All the debugging information is available so that you can check the value of variables and object properties and see how they are changed by the operation of the script. The Debug toolbar one of three toolbars in Script Debugger contains the tools you need to step through a script. Table 15-5 describes the buttons on the Debug toolbar. The debugging process is to step through the script, line by line, until you find an error. When you determine that a specific part of the script works, you can set a breakpoint at the beginning of the untested part and then click Run to get to that point quickly.
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Part 3: Customizing Windows
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Microsoft Windows XP Inside Out, Second Edition
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Table 15-5.
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Script Debugger s Debug Toolbar
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Name
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Button
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Description
Executes the script until it hits a breakpoint, an error, or comes to the end of the script Runs the script outside the debugger
g15dx05
Stop Debugging
g15dx06
Break At Next Statement
g15dx07
Activates an open server script in the debugger; not useful for WSH files Advances the script by one statement; steps into functions and subroutines Advances the script by one statement; executes but does not display functions and subroutines Advances the script until it exits the current function or subroutine Inserts or removes a breakpoint at the line containing the insertion point Clears all breakpoints
Step Into
g15dx08
Step Over
g19dx09
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Step Out
g15dx10
Toggle Breakpoint
g15dx11
Clear All Breakpoints
g15dx12
Running Documents
g15dx13
Displays the Running Documents window
Call Stack
g15dx14
Displays the Call Stack window
Command Window
g15dx15
Displays the Command window
When you believe that your functions and subroutines are working correctly, you can speed up debugging by clicking Step Over to execute them as one step, instead of using the Step Into button.
Part 3: Customizing Windows
Automating Windows XP
Introducing Objects
You can t do much with WSH without using objects. An object is a variable comprising both routines and data that is treated as a discrete entity. Some objects are built into the scripting language; others are provided by the operating system. One of the previous script examples used the WScript.Shell object to gain access to the Windows shell. Table 15-6 describes the objects that are built into VBScript. They are documented, along with the VBScript language, at http://msdn.microsoft.com/library/en-us/script56/html/vtoriVBScript.asp.
Table 15-6.
VBScript Objects
Description
Provides access to the events of a created class Sends output to a script debugger Stores data in key/item pairs Provides access to the properties of a disk drive or network share Collection of all available Drive objects Provides information about run-time errors Provides access to all of the properties of a file Collection of all File objects within a folder Provides access to your computer s file system Provides access to all of the properties of a folder Collection of all Folder objects contained within a Folder object Provides access to the read-only properties of a regular expression match Collection of regular expression Match objects Provides simple regular expression support Collection of regular expression submatch strings Facilitates sequential access to a file
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Object
Class object Debug object Dictionary object Drive object Drives collection Err object File object Files collection FileSystemObject object Folder object Folders collection Match object Matches collection RegExp object SubMatches collection TextStream object
Windows Script Host provides the objects described in Table 15-7. They are documented, along with Windows Script Host, at http://msdn.microsoft.com/scripting (click Windows Script Host Documentation).
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