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Demo for PowerShell script to create ISO using IMAPI COM component, as a simplification for StackOverflow answer http://stackoverflow.com/a/8325316/223837

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createiso-demo.ps1
PowerShell
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# Inspiration from
#
# http://blogs.msdn.com/b/opticalstorage/archive/2010/08/13/writing-optical-discs-using-imapi-2-in-powershell.aspx
#
# and
#
# http://tools.start-automating.com/Install-ExportISOCommand/
#
# with help from
#
# http://stackoverflow.com/a/9802807/223837
 
function WriteIStreamToFile([__ComObject] $istream, [string] $fileName)
{
# NOTE: We cannot use [System.Runtime.InteropServices.ComTypes.IStream],
# since PowerShell apparently cannot convert an IStream COM object to this
# Powershell type. (See http://stackoverflow.com/a/9037299/223837 for
# details.)
#
# It turns out that .NET/CLR _can_ do this conversion.
#
# That is the reason why method FileUtil.WriteIStreamToFile(), below,
# takes an object, and casts it to an IStream, instead of directly
# taking an IStream inputStream argument.
 
$cp = New-Object CodeDom.Compiler.CompilerParameters
$cp.CompilerOptions = "/unsafe"
$cp.WarningLevel = 4
$cp.TreatWarningsAsErrors = $true
 
Add-Type -CompilerParameters $cp -TypeDefinition @"
using System;
using System.IO;
using System.Runtime.InteropServices.ComTypes;
 
namespace My
{
 
public static class FileUtil {
public static void WriteIStreamToFile(object i, string fileName) {
IStream inputStream = i as IStream;
FileStream outputFileStream = File.OpenWrite(fileName);
int bytesRead = 0;
int offset = 0;
byte[] data;
do {
data = Read(inputStream, 2048, out bytesRead);
outputFileStream.Write(data, 0, bytesRead);
offset += bytesRead;
} while (bytesRead == 2048);
outputFileStream.Flush();
outputFileStream.Close();
}
 
unsafe static private byte[] Read(IStream stream, int toRead, out int read) {
byte[] buffer = new byte[toRead];
int bytesRead = 0;
int* ptr = &bytesRead;
stream.Read(buffer, toRead, (IntPtr)ptr);
read = bytesRead;
return buffer;
}
}
 
}
"@
 
[My.FileUtil]::WriteIStreamToFile($istream, $fileName)
}
 
# Constants from http://msdn.microsoft.com/en-us/library/windows/desktop/aa364840.aspx
$FsiFileSystemISO9660 = 1
$FsiFileSystemJoliet = 2
 
 
$fsi = New-Object -ComObject IMAPI2FS.MsftFileSystemImage
 
$fsi.FileSystemsToCreate = $FsiFileSystemISO9660 + $FsiFileSystemJoliet
$fsi.VolumeName = "demo image"
$fsi.Root.AddTree("my folder", $true)
 
WriteIStreamToFile $fsi.CreateResultImage().ImageStream "demo.iso"

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