WEKF_CustomKey (Industry 8.1)

12/2/2014

Review the syntax, members, and examples of the WEKF_CustomKey WMI provider class for Windows Embedded 8.1 Industry (Industry 8.1).

This WMI provider class blocks or unblocks custom-defined key combinations.

Syntax

class WEKF_CustomKey {
    [Static] uint32 Add(
        [In] string CustomKey
    );
    [Static] uint32 Remove(
        [In] string CustomKey
    );

    [Key] string Id;
    [Read, Write] boolean Enabled;
};

Members

The following tables list any methods and properties that belong to this class.

Methods

Methods	Description
WEKF_CustomKey.Add	Creates a new custom key combination and enables Keyboard Filter to block the new key combination.
WEKF_CustomKey.Remove	Removes the specified custom key combination. Keyboard Filter stops blocking the key combination that was removed.

Properties

Property	Data type	Qualifiers	Description
Id	string	[key]	The name of the custom key combination.
Enabled	Boolean	[read, write]	Indicates if the key is blocked or unblocked. This property can be one of the following values: ValueDescription trueIndicates that the key is blocked. falseIndicates that the key is not blocked.

Remarks

You can specify key combinations by including the modifier keys in the name. The most common modifier names are “Ctrl”, “Shift”, “Alt”, and “Win”. You cannot block a combination of non-modifier keys. For example, you can block a key combination of “Ctrl+Shift+F”, but you cannot block a key combination of “A+D”.

When you block a shift-modified key, you must enter the key as “Shift” + the unmodified key. For example, to block the % key on an English keyboard layout, you must specify the key as “Shift+5”. Attempting to block “%”, results in Keyboard Filter blocking “5” instead.

When you specify the key combination to block, you must use the English names for the keys. For a list of the key names you can specify, see Keyboard Filter key names.

Example

The following code demonstrates how to add or enable a custom key combination that Keyboard Filter will block by using the Windows Management Instrumentation (WMI) providers for Keyboard Filter. This example modifies the properties directly and does not call any of the methods defined in WEKF_CustomKey.

<#
.Synopsis
    This script shows how to use the WMI provider to enable and add 
    Keyboard Filter rules through Windows PowerShell on the local computer.
.Parameter ComputerName
    Optional parameter to specify a remote machine that this script should
    manage.  If not specified, the script will execute all WMI operations
    locally.
#>
param (
    [String] $ComputerName
)

$CommonParams = @{"namespace"="root\standardcimv2\embedded"}
$CommonParams += $PSBoundParameters

function Enable-Custom-Key($Id) {
    <#
    .Synopsis
        Toggle on a Custom Key Keyboard Filter Rule
    .Description
        Use Get-WMIObject to enumerate all WEKF_CustomKey instances,
        filter against key value "Id", and set that instance's "Enabled"
        property to 1/true.

        In the case that the Custom instance does not exist, add a new
        instance of WEKF_CustomKey using Set-WMIInstance.
    .Example
        Enable-Custom-Key "Ctrl+V"
        
        Enable filtering of the Ctrl + V sequence.
    #>

    $custom = Get-WMIObject -class WEKF_CustomKey @CommonParams |
        where {
            $_.Id -eq "$Id"
        };

    if ($custom) {
        # Rule exists.  Just enable it.
        $custom.Enabled = 1;
        $custom.Put() | Out-Null;
        "Enabled Custom Filter $Id.";

    } else {
        Set-WMIInstance `
            -class WEKF_CustomKey `
            -argument @{Id="$Id"} `
            @CommonParams | Out-Null
        
        "Added Custom Filter $Id.";
    }
}


# Some example uses of the function defined above.

Enable-Custom-Key "Ctrl+V"
Enable-Custom-Key "Numpad0"
Enable-Custom-Key "Shift+Numpad1"

See Also

Reference

Keyboard Filter WMI provider reference

Concepts

Keyboard Filter