.NET

Get all actual loaded .NET Assemblies (per PowerShell Session)

[System.AppDomain]::CurrentDomain.GetAssemblies()

Messagebox with Button

[System.Windows.Forms.MessageBox]::Show("Text","Überschrift",[System.Windows.Forms.MessageBoxButtons]::OK)

Call a Win32 API function with powershell

Example-Function: GetDriveTypeW

Using Add-Type to call the GetDriveTypeW function

$MethodDefinition = @'
[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
public static extern int GetDriveTypeW(string lpRootPathName);
'@
 
$Kernel32 = Add-Type -MemberDefinition $MethodDefinition -Name 'Kernel32' -Namespace 'Win32' -PassThru

Call the function with the paramter "C:\"

$Kernel32::GetDriveTypeW('C:\')

Output

3

Description The value 3 means "DRIVE_FIXED".
More informations in the documentation: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getdrivetypew

Example-Function: GetLogicalDriveStrings (running C# in PowerShell)

$code = @"
using System;
using System.Collections.Specialized;
using System.Runtime.InteropServices;
 
public class Mainline
{
[DllImport("kernel32.dll")]
static extern uint GetLogicalDriveStrings(uint nBufferLength, [Out] char[] lpBuffer);
 
public static void Main()
{
    const int size = 512;
    char[] buffer = new char[size];
    uint code = GetLogicalDriveStrings(size, buffer);
 
    if (code == 0)
    {
       Console.WriteLine("Call failed");
       return;
    }
 
    StringCollection list = new StringCollection();
    int start = 0;
    for (int i = 0;  i < code;  ++i)
    {
       if (buffer[i] == 0)
       {
          string s = new string(buffer, start, i - start);
          list.Add(s);
          start = i + 1;
       }
    }
 
    foreach (string s in list)
       Console.WriteLine(s);
}
}
 
"@
 
Add-Type -TypeDefinition $code -Language CSharp
[Mainline]::main()

The code is a copy of the function from PInvoke: http://pinvoke.net/default.aspx/kernel32/GetLogicalDriveStrings.html

Troubleshooting

Error "StringBuilder"

The type or namespace name 'StringBuilder' could not be found (are you missing a using directive or an assembly reference?)

Description

StringBuilder is defined in the System.Text namespace, but the using directive goes at the top of the program by the class definition. Since we’re letting PowerShell define the type for us, we can either rename it to System.Text.StringBuilder,

Solution

Replace StringBuilder with System.Text.StringBuilder.

More informations:

• https://devblogs.microsoft.com/scripting/use-powershell-to-interact-with-the-windows-api-part-1/