'Absent Value' Failure Emulation

Applies to AQTime 8.81, last modified on January 18, 2022

About 'Absent Value' Failure Emulation

Use this kind of failure emulations to check whether your application handles errors that occur when it tries to access a value that does not exist in the registry. AQTime will catch all the attempts of your application to access the specified registry value and make the profiled application “think” that this value does not exist.

Specifying Emulation Parameters

You can specify emulation parameters in the Profiler Options dialog which AQTime invokes upon running the Failure Emulator profiler or in the Failure Profiler Options dialog.

To create a new 'Absent Value' failure emulation and specify its parameters:

  • In the dialog, click Add.

  • On the first page of the subsequent Add New Failure Emulation wizard, select the Registry category from the list on the left, then select Absent Value from the list on the right and click Next.

  • On the second page of the wizard, specify all parameters for the selected failure emulation and click Finish.

To modify parameters of an existing 'Absent Value' failure emulation:

  • Click the ellipsis button in the Parameters cell.

  • In the subsequent Edit 'Absent Value' Failure Parameters dialog, modify the desired parameters and click OK.

AQTime saves your settings between profiler runs, so you will not have to define parameters next time you run the profiler.


Registry key

Specifies the name of the registry key.

Registry value

Specifies the name of the registry value that belongs to the specified registry key. If you want to emulate the situation when several values of the specified registry key do not exist, use wildcards or regular expressions to specify a mask for the target values.


Specifies whether you want to use wildcards or regular expressions to set other parameters of the failure emulation. Choose the desired type of special symbols to use from the drop-down list:

  • Regular expressions are coded strings that define an infinite number of possible matches. For more information on regular expressions and how to use them in parameter values, see Regular Expressions.

  • Wildcards are special symbols that can be used to match characters in string values. AQTime supports two standard wildcards: the asterisk (*) and the question mark (?). For more information on wildcards and how to use them in parameter values, see Using Wildcards.

To quickly insert a regular expression or a wildcard into a parameter value, click and select the desired item from the consequent menu. Note that the menu also provides a brief description of available regular expressions and wildcards.

For information on using the Failure Emulator profiler, see Failure Emulator Profiler - Overview.

See Also

Registry Failure Emulation
Failure Emulation Reference
Failure Emulator Profiler - Overview

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