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Accepted
Bernard Vander Beken
Asked: 2020-04-30 01:03:42 +0800 CST

Cause of Warning: PowerShell detected that you might be using a screen reader and has disabled PSReadLine for compatibility purposes

  • 772

Steps

Launch PowerShell 7 on Windows 10.

Actual result

PowerShell 7.0.0
Copyright (c) Microsoft Corporation. All rights reserved.

https://aka.ms/powershell
Type 'help' to get help.

Warning: PowerShell detected that you might be using a screen reader and has disabled PSReadLine for compatibility purposes. If you want to re-enable it, run 'Import-Module PSReadLine'.

Expected result

No warning is displayed when PowerShell starts, since I am not using a screen reader.

Workaround

Run the specified command Import-Module PSReadLine. I haven't run this since I first want to understand why the warning is here.

$PSVersionTable output:

Name                           Value
----                           -----
PSVersion                      7.0.0
PSEdition                      Core
GitCommitId                    7.0.0
OS                             Microsoft Windows 10.0.18362
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Additional info

I have Visual Studio 2017, 2019 installed

powershell powershell-v7

2 Answers

  1. Best Answer

    Set the following registry key:

    Windows Registry 
Computer\HKEY_CURRENT_USER\Control Panel\Accessibility\Blind Access\On

    to value 0 and reboot.

    I discovered this alternative solution via the issue mentioned by @Znatz.

    Source

    • 22

  2. There is a fix for this error.

    Powershell issue #11751

    Create a .ps1 file, paste the following code and run it with powershell.

    Add-Type -TypeDefinition '
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

public static class ScreenReaderFixUtil
{
    public static bool IsScreenReaderActive()
    {
        var ptr = IntPtr.Zero;
        try
        {
            ptr = Marshal.AllocHGlobal(sizeof(int));
            int hr = Interop.SystemParametersInfo(
                Interop.SPI_GETSCREENREADER,
                sizeof(int),
                ptr,
                0);

            if (hr == 0)
            {
                throw new Win32Exception(Marshal.GetLastWin32Error());
            }

            return Marshal.ReadInt32(ptr) != 0;
        }
        finally
        {
            if (ptr != IntPtr.Zero)
            {
                Marshal.FreeHGlobal(ptr);
            }
        }
    }

    public static void SetScreenReaderActiveStatus(bool isActive)
    {
        int hr = Interop.SystemParametersInfo(
            Interop.SPI_SETSCREENREADER,
            isActive ? 1u : 0u,
            IntPtr.Zero,
            Interop.SPIF_SENDCHANGE);

        if (hr == 0)
        {
            throw new Win32Exception(Marshal.GetLastWin32Error());
        }
    }

    private static class Interop
    {
        public const int SPIF_SENDCHANGE = 0x0002;

        public const int SPI_GETSCREENREADER = 0x0046;

        public const int SPI_SETSCREENREADER = 0x0047;

        [DllImport("user32", SetLastError = true, CharSet = CharSet.Unicode)]
        public static extern int SystemParametersInfo(
            uint uiAction,
            uint uiParam,
            IntPtr pvParam,
            uint fWinIni);
    }
}'

if ([ScreenReaderFixUtil]::IsScreenReaderActive()) {
    [ScreenReaderFixUtil]::SetScreenReaderActiveStatus($false)
}
    • 12