PowerShell：检测窗口或程序是前台还是后台

Question 1

您想要实现什么目标或者为什么？

您不会说出您尝试过什么，也不会展示它以及您遇到了什么错误。系统上运行的所有进程都有进程名称和 ID，您可以说获取启动时间，而较近的那个可能就是活动的进程。

# get all object members of a process
get-process | Select * -First 1 | Get-Member


Name                       : aesm_service
Id                         : 19420
PriorityClass              : Normal
FileVersion                : 2.0.101.44237
HandleCount                : 169
WorkingSet                 : 8597504
PagedMemorySize            : 2203648
PrivateMemorySize          : 2203648
VirtualMemorySize          : 87666688
TotalProcessorTime         : 00:00:00.1250000
SI                         : 0
Handles                    : 169
VM                         : 4382633984
WS                         : 8597504
PM                         : 2203648
NPM                        : 2189736
Path                       : C:\WINDOWS\System32...aesm_service.exe
Company                    : Intel Corporation
CPU                        : 0.125
ProductVersion             : 2.0.101.44237
Description                : Intel® SGX Application Enclave Services Manager
Product                    : Intel® Software Guard Extensions
__NounName                 : Process
BasePriority               : 8
ExitCode                   : 
HasExited                  : False
ExitTime                   : 
Handle                     : 6280
SafeHandle                 : Microsoft.Win32.SafeHandles.SafeProcessHandle
MachineName                : .
MainWindowHandle           : 0
MainWindowTitle            : 
MainModule                 : System.Diagnostics.ProcessModule (aesm_service.exe)
MaxWorkingSet              : 1413120
MinWorkingSet              : 204800
Modules                    : {System.Diagnostics....
NonpagedSystemMemorySize   : 2189736
NonpagedSystemMemorySize64 : 2189736
PagedMemorySize64          : 2203648
PagedSystemMemorySize      : 102120
PagedSystemMemorySize64    : 102120
PeakPagedMemorySize        : 3158016
PeakPagedMemorySize64      : 3158016
PeakWorkingSet             : 9588736
PeakWorkingSet64           : 9588736
PeakVirtualMemorySize      : 99708928
PeakVirtualMemorySize64    : 4394676224
PriorityBoostEnabled       : True
PrivateMemorySize64        : 2203648
PrivilegedProcessorTime    : 00:00:00.0937500
ProcessName                : aesm_service
ProcessorAffinity          : 255
Responding                 : True
SessionId                  : 0
StartInfo                  : System.Diagnostics.ProcessStartInfo
StartTime                  : 9/7/2018 1:16:52 PM
SynchronizingObject        : 
Threads                    : {12776, 19072}
UserProcessorTime          : 00:00:00.0312500
VirtualMemorySize64        : 4382633984
EnableRaisingEvents        : False
StandardInput              : 
StandardOutput             : 
StandardError              : 
WorkingSet64               : 8597504
Site                       : 
Container                  : 


get-process | 
Select StartTime,ProcessName | 
Sort-Object StartTime | 
Format-Table -AutoSize


StartTime           ProcessName                                 
---------           -----------                                 
                    Idle                                        
9/7/2018 1:14:17 PM Secure System                               
9/7/2018 1:14:17 PM Registry 
….

现在，如果您说，您正尝试在远程主机上执行此操作，这是一个完全不同的问题，因为最新的进程可能并不重要，用户将使用他们正在使用的任何进程。

你没有说明你搜索和尝试了什么，以及它是否对你有用。网络上有多个地方的例子，讨论了类似的用例。

查看这些讨论和答案，您会注意到，它需要调用 C 代码和 Windows DLL。

https://stackoverflow.com/questions/9722252/how-can-i-get-the-current-active-window-at-the-time-a-batch-script-is-run

Add-Type @"
  using System;
  using System.Runtime.InteropServices;
  public class Tricks {
    [DllImport("user32.dll")]
    public static extern IntPtr GetForegroundWindow();
}
"@

$a = [tricks]::GetForegroundWindow()

get-process | ? { $_.mainwindowhandle -eq $a }

https://techibee.com/powershell/get-active-window-on-desktop-using-powershell/2178

[CmdletBinding()]            
Param(            
)            
Add-Type @"
  using System;
  using System.Runtime.InteropServices;
  public class UserWindows {
    [DllImport("user32.dll")]
    public static extern IntPtr GetForegroundWindow();
}
"@            
try {            
$ActiveHandle = [Windows]::GetForegroundWindow()            
$Process = Get-Process | ? {$_.MainWindowHandle -eq $activeHandle}            
$Process | Select ProcessName, @{Name="AppTitle";Expression= {($_.MainWindowTitle)}}            
} catch {            
 Write-Error "Failed to get active Window details. More Info: $_"            
}

https://social.technet.microsoft.com/Forums/en-US/4d257c80-557a-4625-aad3-f2aac6e9a1bd/get-active-window-info

当您选择不同的窗口时，这将改变其输出。将窗口设置得足够小，以便您在选择新窗口时可以查看输出。

如果您有双显示器，则将 PS 放在第二台显示器上，然后在另一台显示器上选择窗口。

$code = @'
    [DllImport("user32.dll")]
     public static extern IntPtr GetForegroundWindow();
'@
Add-Type $code -Name Utils -Namespace Win32
while(1){
    $hwnd = [Win32.Utils]::GetForegroundWindow()
    Get-Process | 
        Where-Object { $_.mainWindowHandle -eq $hwnd } | 
        Select-Object processName, MainWindowTItle, MainWindowHandle
    sleep -Milliseconds 200
}

或者购买这个模块...

https://www.vexasoft.com/pages/get-window
Get-Window

Synopsis
Gets the application windows that are open on the local desktop. 
Syntax
• Get-Window [-Process] [-ShowBackgroundWindows]
• Get-Window [-Title] [-ShowBackgroundWindows]
• Get-Window [-ProcessID] [-ShowBackgroundWindows]

Description
The Get-Window cmdlet gets the application windows that are open on the local desktop.

Answer