获取远程计算机上已安装软件的版本

Question

I am trying a write an application to fetch the version of the application installed on remote machines. There is a need to query many remote servers and get the version of the application and show it on the dashboard. Powershell WMI takes too long to get the information. I am looking for something lot faster.

The app will read remote server information like IP, Username, and password from a config file and fetch the data.

Any help is really appreciated.

Answer 1

It sounds like you want to take a closer look at Powershell Sessions .

There are at least two ways to approach in from there, one is using Invoke-Command in combination with the -ComputerName attribute, possibly along with -Authentication or -Credential . -ScriptBlock contains the code you want to run.

 Invoke-Command -ComputerName "computername.domain.local" -ScriptBlock {... }

I assume from "the application" that your concern is one application, and not every application. Then you should be able to tell the version by running Get-Item on the executable, then look at either VersionInfo.ProductVersion or VersionInfo.FileVersion , whichever is more relevant to your case.

To access one of them, you could use something like:

 $version = (Get-Item "path-to-executable\executable.exe').VersionInfo.ProductVersion

To find out which attributes are relevant to your executable, you can run

Get-Item "executable.exe" | Select -ExpandProperty VersionInfo | Format-List *

Combining these techniques, you could try something like this.

 # this is a dummy array for example purposes $computers = @(@{'ip' = '127.0.0.1'; 'username' = 'admin'; 'password' = 'password'}) foreach($computer in $computers) { # creating a PSCredential object from plain text passwords is not a good practice, but I'm assuming here that's what you've got to work with $credentials = [System.Management.Automation.PSCredential]::new($computer.username, (ConvertTo-SecureString -String $computer.password -AsPlainText -Force)) # fetch versioninfo info from remote computer $versioninfo = Invoke-Command -ComputerName $computer.ip -Credential $credentials -ScriptBlock { Get-Item "executable.exe" | Select -ExpandProperty VersionInfo if ($versioninfo.ProductVersion -ne '3.1.2414.0') { # do something if product version isn't 3.1.2414.0 } if ($versioninfo.ProductVersionRaw.Major -lt 5) { # do something if product version major part is less than 5 (true for 1.5.5.5 but false for 5.1.1.1) } }

If you want to run several commands on the client computers, use New-PSSession and pass the session along to every call to Invoke-Command , otherwise you'd lose time and resources opening a new session every time. Here's an example on how that could be achieved:

 $session = New-PSSession -ComputerName $computer.ip -Credential $credentials $versioninfo = Invoke-Command -Session $session -ScriptBlock { # do something } if ($versioninfo.ProductVersion -lt 1) { Invoke-Command -Session $session -ScriptBlock { # do something else } } Remove-PSSession -Session $session

You might also want to check out the using: scope modifier if you find a need to pass variables along to the remote computer, which would make $localvariable visible at the remote computer with $using:localvariable (readonly)

If time is still a concern after this (especially with tcp timeouts on offline hosts), then threading is the next topic you'd want to look into.

As far as I know, my code is compatible with Powershell v3.1, but I recommend using no less than v5, especially on the machine running the script.

This should be enough information to send you on your way. Good luck.:)