core/utils/Update-EnvironmentVariables.ps1

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<#
The MIT License (MIT)
 
Copyright (c) 2015 Objectivity Bespoke Software Specialists
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
#>


function Update-EnvironmentVariables {
    <#
    .SYNOPSIS
    Reloads environment variables.
     
    .DESCRIPTION
    Need to be run after changing global environment variables.
    For details see http://stackoverflow.com/questions/6979741/setting-environment-variables-requires-reboot-on-64-bit
 
    .EXAMPLE
    Update-EnvironmentVariables
    #>


    [CmdletBinding()]
    [OutputType([void])]
    param()

    Write-Log -Info "Reloading environment variables."
    if (-not ("win32.nativemethods" -As [type])) {
        # import sendmessagetimeout from win32
        Add-Type -Namespace Win32 -Name NativeMethods -MemberDefinition @"
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern IntPtr SendMessageTimeout(
IntPtr hWnd, uint Msg, UIntPtr wParam, string lParam,
uint fuFlags, uint uTimeout, out UIntPtr lpdwResult);
"@

    }
 
    $HWND_BROADCAST = [intptr]0xffff;
    $WM_SETTINGCHANGE = 0x1a;
    $result = [uintptr]::zero
 
    # notify all windows of environment block change
    [void]([win32.nativemethods]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE, [uintptr]::Zero, "Environment", 2, 5000, [ref]$result))

    if ($result -eq 0) {
        throw "Failed to reload environment variables."
    } else {
        Write-Log -Info "Environment variables have been reloaded."
    }
}