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June 18, 2024 02:35
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Save BenjaminArmstrong/e6e4c771b5553b6c15788a3406feb934 to your computer and use it in GitHub Desktop.
Sample PowerShell script that shows you how to create a .BMP file of the display of a Hyper-V virtual machine.
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$VMName = "VM 1" | |
$BMPName = "C:\Users\benja\Desktop\test.bmp" | |
Add-Type -AssemblyName "System.Drawing" | |
$VMCS = Get-WmiObject -Namespace root\virtualization\v2 -Class Msvm_ComputerSystem -Filter "ElementName='$($VMName)'" | |
# Get the resolution of the screen at the moment | |
$video = $VMCS.GetRelated("Msvm_VideoHead") | |
$xResolution = $video.CurrentHorizontalResolution[0] | |
$yResolution = $video.CurrentVerticalResolution[0] | |
function getVMScreenBMP { | |
param | |
( | |
$VM, | |
$x, | |
$y | |
) | |
$VMMS = Get-WmiObject -Namespace root\virtualization\v2 -Class Msvm_VirtualSystemManagementService | |
# Get screenshot | |
$image = $VMMS.GetVirtualSystemThumbnailImage($VMCS, $x, $y).ImageData | |
# Transform into bitmap | |
$BitMap = New-Object System.Drawing.Bitmap -Args $x,$y,Format16bppRgb565 | |
$Rect = New-Object System.Drawing.Rectangle 0,0,$x,$y | |
$BmpData = $BitMap.LockBits($Rect,"ReadWrite","Format16bppRgb565") | |
[System.Runtime.InteropServices.Marshal]::Copy($Image, 0, $BmpData.Scan0, $BmpData.Stride*$BmpData.Height) | |
$BitMap.UnlockBits($BmpData) | |
return $BitMap | |
} | |
(getVMScreenBMP $VMCS $xResolution $yResolution).Save($BMPName) |
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I can confirm this works on Windows PowerShell, but not modern PowerShell (
powershell.exe
, notpwsh.exe
), at least on my machine. This is awesome!EDIT (18 June 2024): The code as-is only works in Windows PowerShell, but that's because there are newer APIs for using WMI/CIM in modern PowerShell.
For my purposes, I used runspaces to continue using the old APIs, but you can see a modern implementation in strawgate's HyperV-OCR project (a friend found that for me).
Runspace alternative: