使用“setx”并重新启动cmd提示符

有一个名为“setx”的命令行工具用于此作业。 它用于读取和写入env变量。 这些变量在命令窗口关闭后仍然存在。

创建或修改用户或系统环境中的环境变量，而不需要编程或脚本。setx命令还检索注册表项的值，并将它们写入文本文件。

注意:通过此工具创建或修改的变量将在以后的命令窗口中可用，但在当前CMD.exe命令窗口中不可用。所以，你必须重新开始。

如果缺少setx:

http://download.microsoft.com/download/win2000platform/setx/1.00.0.1/nt5/en-us/setx_setup.exe

或修改注册表

MSDN说:

若要以编程方式添加或修改系统环境变量，请使用add 他们去 HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ \控制会话 Manager\Environment注册表项，然后广播一个WM_SETTINGCHANGE 消息，lParam设置为字符串“环境”。 这允许应用程序(如shell)接收您的更新。

这适用于windows 7: SET PATH=%PATH%

通过输入echo %PATH%测试，它工作正常。也设置如果你打开一个新的cmd，不需要那些讨厌的重新启动:)

在不重启当前会话的情况下，向路径中添加变量的最简单方法是打开命令提示符并输入:

PATH=(VARIABLE);%path%

并按enter键。

要检查变量是否已加载，请键入

PATH

并按enter键。但是，在重新启动之前，该变量将只是路径的一部分。

调用这个函数对我来说很有用:

VOID Win32ForceSettingsChange()
{
    DWORD dwReturnValue;
    ::SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, (LPARAM) "Environment", SMTO_ABORTIFHUNG, 5000, &dwReturnValue);
}

在最终找到一个更简单的解决方案之前，我偶然发现了这个答案。

只需在任务管理器中重新启动explorer.exe。

我没有测试，但您可能还需要重新打开命令提示符。

这里归功于Timo Huovinen:虽然成功安装了节点但无法识别(如果这对你有帮助，请给这个人的评论加分)。

我使用这个Powershell脚本添加到PATH变量中。 只要稍加调整，我相信它也适用于你的情况。

#REQUIRES -Version 3.0

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

function global:ADD-PATH
{
    [Cmdletbinding()]
    param ( 
        [parameter(Mandatory=$True, ValueFromPipeline=$True, Position=0)] 
        [string] $Folder
    )

    # See if a folder variable has been supplied.
    if (!$Folder -or $Folder -eq "" -or $Folder -eq $null) { 
        throw 'No Folder Supplied. $ENV:PATH Unchanged'
    }

    # Get the current search path from the environment keys in the registry.
    $oldPath=$(Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH).Path

    # See if the new Folder is already in the path.
    if ($oldPath | Select-String -SimpleMatch $Folder){ 
        return 'Folder already within $ENV:PATH' 
    }

    # Set the New Path and add the ; in front
    $newPath=$oldPath+';'+$Folder
    Set-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH -Value $newPath -ErrorAction Stop

    # Show our results back to the world
    return 'This is the new PATH content: '+$newPath

    # notify all windows of environment block change
    [win32.nativemethods]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE, [uintptr]::Zero, "Environment", 2, 5000, [ref]$result)
}

function global:REMOVE-PATH {
    [Cmdletbinding()]
    param ( 
        [parameter(Mandatory=$True, ValueFromPipeline=$True, Position=0)]
        [String] $Folder
    )

    # See if a folder variable has been supplied.
    if (!$Folder -or $Folder -eq "" -or $Folder -eq $NULL) { 
        throw 'No Folder Supplied. $ENV:PATH Unchanged'
    }

    # add a leading ";" if missing
    if ($Folder[0] -ne ";") {
        $Folder = ";" + $Folder;
    }

    # Get the Current Search Path from the environment keys in the registry
    $newPath=$(Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH).Path

    # Find the value to remove, replace it with $NULL. If it's not found, nothing will change and you get a message.
    if ($newPath -match [regex]::Escape($Folder)) { 
        $newPath=$newPath -replace [regex]::Escape($Folder),$NULL 
    } else { 
        return "The folder you mentioned does not exist in the PATH environment" 
    }

    # Update the Environment Path
    Set-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH -Value $newPath -ErrorAction Stop

    # Show what we just did
    return 'This is the new PATH content: '+$newPath

    # notify all windows of environment block change
    [win32.nativemethods]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE, [uintptr]::Zero, "Environment", 2, 5000, [ref]$result)
}


# Use ADD-PATH or REMOVE-PATH accordingly.

#Anything to Add?

#Anything to Remove?

REMOVE-PATH "%_installpath_bin%"