Create ISO image using PowerShell: how to save IStream to file?

You need to use FileStream writer. Check this link for an example of how it is done in c#.http://tools.start-automating.com/Install-ExportISOCommand/?-Download

The function there can be used to create cmdlets that help you create ISO. For example,

Run Install-ExportISOCommandThis creates Export-Iso

Then, use Export-ISO to create an ISO.

Export-Iso -ISOPath C:\dropbox\test.iso -FileName C:\Dropbox\Scripts

You can use the DiscUtils library to make ISOs (and manage other disk formats such as VHD/VHDX, DMG, FAT, etc). A PowerShell module is supported as well an MSBUILD task to automatically create your ISO on project build.

Create a CDBuilder object and go to town with adding files and directories then save it to disk with the Build method. Download documentation here.

 CDBuilder builder = new CDBuilder(); builder.AddFile("samplefile.txt", new byte[] { }); builder.Build(@"c:\output.iso");

The great thing about this approach is that it is 100% managed code and cross-platform - there is no IMAPI2 COM/Marshaling requirement.

This is an end-to-end PowerShell ISO creator with GUI that I've used many times. No additional software required.

    # Author: Hrisan Dzhankardashliyski# Date: 20/05/2015# Inspiration from##   http://blogs.msdn.com/b/opticalstorage/archive/2010/08/13/writing-optical-discs-using-imapi-2-in-powershell.aspx</a>## and##   http://tools.start-automating.com/Install-ExportISOCommand/</a>## with help from##   http://stackoverflow.com/a/9802807/223837</a>$InputFolder = ""function WriteIStreamToFile([__ComObject] $istream, [string] $fileName){# NOTE: We cannot use [System.Runtime.InteropServices.ComTypes.IStream],# since PowerShell apparently cannot convert an IStream COM object to this# Powershell type.  (See <a href="http://stackoverflow.com/a/9037299/223837">http://stackoverflow.com/a/9037299/223837</a> for# details.)## It turns out that .NET/CLR _can_ do this conversion.## That is the reason why method FileUtil.WriteIStreamToFile(), below,# takes an object, and casts it to an IStream, instead of directly# taking an IStream inputStream argument.$cp = New-Object CodeDom.Compiler.CompilerParameters$cp.CompilerOptions = "/unsafe"$cp.WarningLevel = 4$cp.TreatWarningsAsErrors = $trueAdd-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, $fileName)}# The Function defines the ISO parameturs and writes it to filefunction createISO([string]$VolName,[string]$Folder,[bool]$IncludeRoot,[string]$ISOFile){# Constants from <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa364840.aspx">http://msdn.microsoft.com/en-us/library/windows/desktop/aa364840.aspx</a>$FsiFileSystemISO9660   = 1$FsiFileSystemJoliet    = 2$FsiFileSystemUDF      = 4$fsi = New-Object -ComObject IMAPI2FS.MsftFileSystemImage#$fsi.FileSystemsToCreate = $FsiFileSystemISO9660 + $FsiFileSystemJoliet$fsi.FileSystemsToCreate = $FsiFileSystemUDF#When FreeMediaBlocks is set to 0 it allows the ISO file to be with unlimited size$fsi.FreeMediaBlocks = 0$fsi.VolumeName = $VolName$fsi.Root.AddTree($Folder, $IncludeRoot)WriteIStreamToFile $fsi.CreateResultImage().ImageStream $ISOFile}Function Get-Folder($initialDirectory){[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms")$foldername = New-Object System.Windows.Forms.FolderBrowserDialog$foldername.rootfolder = "MyComputer"if($foldername.ShowDialog() -eq "OK"){$folder += [string]$foldername.SelectedPath}return $folder}# Show an Open Folder Dialog and return the directory selected by the user.function Read-FolderBrowserDialog([string]$Message, [string]$InitialDirectory, [switch]$NoNewFolderButton){$browseForFolderOptions = 0if ($NoNewFolderButton) { $browseForFolderOptions += 512 }$app = New-Object -ComObject Shell.Application$folder = $app.BrowseForFolder(0, $Message, $browseForFolderOptions, $InitialDirectory)if ($folder) { $selectedDirectory = $folder.Self.Path }else { $selectedDirectory = '' }[System.Runtime.Interopservices.Marshal]::ReleaseComObject($app) > $nullreturn $selectedDirectory}#Prompts the user to save the ISO file, if the files does not exists it will create it otherwise overwrite without promptFunction Get-SaveFile($initialDirectory){[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") |Out-Null$SaveFileDialog = New-Object System.Windows.Forms.SaveFileDialog$SaveFileDialog.CreatePrompt = $false$SaveFileDialog.OverwritePrompt = $false$SaveFileDialog.initialDirectory = $initialDirectory$SaveFileDialog.filter = "ISO files (*.iso)| *.iso"$SaveFileDialog.ShowHelp = $true$SaveFileDialog.ShowDialog() | Out-Null$SaveFileDialog.filename}# Show message box popup and return the button clicked by the user.function Read-MessageBoxDialog([string]$Message, [string]$WindowTitle, [System.Windows.Forms.MessageBoxButtons]$Buttons = [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]$Icon = [System.Windows.Forms.MessageBoxIcon]::None){Add-Type -AssemblyName System.Windows.Formsreturn [System.Windows.Forms.MessageBox]::Show($Message, $WindowTitle, $Buttons, $Icon)}# GUI interface for the PowerShell script[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")  #loading the necessary .net libraries (using void to suppress output)$Form = New-Object System.Windows.Forms.Form    #creating the form (this will be the "primary" window)$Form.Text = "ISO Creator Tool:"$Form.Size = New-Object System.Drawing.Size(600,300)  #the size in px of the window length, height$Form.FormBorderStyle = 'FixedDialog'$Form.MaximizeBox = $false$Form.MinimizeBox = $false$objLabel = New-Object System.Windows.Forms.Label$objLabel.Location = New-Object System.Drawing.Size(20,20)$objLabel.Size = New-Object System.Drawing.Size(120,20)$objLabel.Text = "Please select a Folder:"$Form.Controls.Add($objLabel)$InputBox = New-Object System.Windows.Forms.TextBox$InputBox.Location = New-Object System.Drawing.Size(150,20)$InputBox.Size = New-Object System.Drawing.Size(300,20)$InputBox.Enabled = $false$Form.Controls.Add($InputBox)$objLabel2 = New-Object System.Windows.Forms.Label$objLabel2.Location = New-Object System.Drawing.Size(20,80)$objLabel2.Size = New-Object System.Drawing.Size(120,20)$objLabel2.Text = "ISO File Name:"$Form.Controls.Add($objLabel2)$InputBox2 = New-Object System.Windows.Forms.TextBox$InputBox2.Location = New-Object System.Drawing.Size(150,80)$InputBox2.Size = New-Object System.Drawing.Size(300,20)$InputBox2.Enabled = $false$Form.Controls.Add($InputBox2)$objLabel3 = New-Object System.Windows.Forms.Label$objLabel3.Location = New-Object System.Drawing.Size(20,50)$objLabel3.Size = New-Object System.Drawing.Size(120,20)$objLabel3.Text = "ISO Volume Name:"$Form.Controls.Add($objLabel3)$InputBox3 = New-Object System.Windows.Forms.TextBox$InputBox3.Location = New-Object System.Drawing.Size(150,50)$InputBox3.Size = New-Object System.Drawing.Size(150,20)$Form.Controls.Add($InputBox3)$objLabel4 = New-Object System.Windows.Forms.Label$objLabel4.Location = New-Object System.Drawing.Size(20,120)$objLabel4.Size = New-Object System.Drawing.Size(120,20)$objLabel4.Text = "Status Msg:"$Form.Controls.Add($objLabel4)$InputBox4 = New-Object System.Windows.Forms.TextBox$InputBox4.Location = New-Object System.Drawing.Size(150,120)$InputBox4.Size = New-Object System.Drawing.Size(200,20)$InputBox4.Enabled = $false$InputBox4.Text = "Set ISO Parameters..."$InputBox4.BackColor = "LightGray"$Form.Controls.Add($InputBox4)$Button = New-Object System.Windows.Forms.Button$Button.Location = New-Object System.Drawing.Size(470,20)$Button.Size = New-Object System.Drawing.Size(80,20)$Button.Text = "Browse"$Button.Add_Click({$InputBox.Text=Read-FolderBrowserDialog$InputBox4.Text = "Set ISO Parameters..."})$Form.Controls.Add($Button)$Button2 = New-Object System.Windows.Forms.Button$Button2.Location = New-Object System.Drawing.Size(470,120)$Button2.Size = New-Object System.Drawing.Size(80,80)$Button2.Text = "CreateISO"$Button2.Add_Click({if(($InputBox.Text -eq "") -or ($InputBox3.Text -eq "")){Read-MessageBoxDialog "You have to select folder and specify ISO Volume Name" "Error: No Parameters entered!"} else{$SaveDialog = Get-SaveFile#If you click cancel when save file dialog is calledif ($SaveDialog -eq ""){return}$InputBox2.Text= $SaveDialog$InputBox2.Refresh()if($checkBox1.Checked){$includeRoot=$true}else{$includeRoot=$false}$InputBox4.BackColor = "Yellow"$InputBox4.Text = "Generating ISO file..."$InputBox4.Refresh()createISO $InputBox3.Text $InputBox.Text $includeRoot $InputBox2.Text$InputBox4.BackColor = "LimeGreen"$InputBox4.Text = "ISO Creation Finished!"$InputBox4.Refresh()}})$Form.Controls.Add($Button2)$objLabel5 = New-Object System.Windows.Forms.Label$objLabel5.Location = New-Object System.Drawing.Size(20,160)$objLabel5.Size = New-Object System.Drawing.Size(280,20)$objLabel5.Text = "Check the box if you want to include the top folder:"$Form.Controls.Add($objLabel5)$checkBox1 = New-Object System.Windows.Forms.CheckBox$checkBox1.Location = New-Object System.Drawing.Size(300,156)$Form.Controls.Add($checkBox1)$Form.Add_Shown({$Form.Activate()})[void] $Form.ShowDialog()