我正在尝试从服务器向大约50个运行Powershell的客户端发送一些命令。大多数命令使用Invoke-Command工作。我使用了与其他命令完全相同的格式,但这个命令不起作用。基本上我想让每个客户端从我的服务器获取一个.xml文件,以便稍后导入它。我错过了我的代码示例中的$凭据和其他变量,但是我的脚本中的其他位置正确设置了它们。
权限明确,winrm中的TrustedHosts设置为*,脚本执行设置为Unrestricted。
clear
$temp = RetrieveStatus
$results = $temp.up #Contains pinged hosts that successfully replied.
$profileName = Read-Host "Enter the profile name(XML file must be present in c:\share\profiles\)"
$File = "c:\profiles\profile.xml"
$webclient = New-Object System.Net.WebClient
$webclient.Proxy = $NULL
$ftp = "ftp://anonymous:anonymous@192.168.2.200/profiles/$profileName"
$uri = New-Object System.Uri($ftp)
$command = {write-host (hostname) $webclient.DownloadFile($uri, $File)}
foreach($result in $results)
{
# download profile from C:\share\profiles
Invoke-Command $result.address -ScriptBlock $command -Credential $credentials
# add profile to wireless networks
# Invoke-Command $result.address -ScriptBlock {write-host (hostname) (netsh wlan add profile filename="c:\profiles\$args[0].xml")} -argumentlist $profileName -Credential $credentials
}
我收到以下错误:
You cannot call a method on a null-valued expression.
+ CategoryInfo : InvalidOperation: (DownloadFile:String) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
有什么想法吗?在本地运行时,相同的命令在客户端上完美运行。
答案 0 :(得分:3)
您在脚本块中使用$webclient
,而另一端不会定义$webclient
。为什么不在脚本块中创建Web客户端,例如:
$command = {
param($profileName)
$File = "c:\profiles\profile.xml"
$webclient = New-Object System.Net.WebClient
$webclient.Proxy = $NULL
$ftp = "ftp://anonymous:anonymous@192.168.2.200/profiles/$profileName"
$uri = New-Object System.Uri($ftp)
Write-Host (hostname)
$webclient.DownloadFile($uri, $File)}
}
$profileName = Read-Host "Enter the profile name(XML file must be present in c:\share\profiles\)"
Invoke-Command $result.address -ScriptBlock $command -Credential $credentials -Arg $profileName
这将要求您通过-ArgumentList
上的Invoke-Command
参数从客户端向远程计算机提供一些变量。然后,那些提供的参数将映射到scriptblock中的param()
语句。