Scott H’s RSS download script

From:

Here is a script that can grab items from a rss feed:
mkdir “~\Desktop\AzureFriday”
cd “~\Desktop\AzureFriday”
[Environment]::CurrentDirectory=(Get-Location PSProvider FileSystem).ProviderPath
$a = ([xml](new-object net.webclient).downloadstring(http://channel9.msdn.com/Shows/Azure-Friday/feed/mp4high”))
$a.rss.channel.item | foreach{
$url = New-Object System.Uri($_.enclosure.url)
$file = $url.Segments[1]
“Downloading: “ + $file
if (!(test-path $file))
{
(New-Object System.Net.WebClient).DownloadFile($url, $file)
}
}
This is a great example of using powershell with the ,net framework.

Powershell 101 – Setup

This is the first in a series of articles that I am going to write about an introduction to powershell.

However to start with I’ll give a useful option for the Powershell Integrated Scripting Environment (ISE – pronounced ICE).

$psISE.Options.FontSize = 20

This allows the editor to be seen in a presentation room.

This is a good example of powershell being embedded in another application.

Now the question is how did I find out about this property?

First I started up the ISE

Then I wanted to find out what variables existed.

That required querying the variables virtual drive:

However I can’t remember the name of this drive.

So the starting point was:

get-psdrive

This returned a list that looks like:

Name Provider Root
Alias Microsoft.PowerShell.Core\Alias
C Microsoft.PowerShell.Core\FileSystem C:\
Cert Microsoft.PowerShell.Security\Certificate \
D Microsoft.PowerShell.Core\FileSystem D:\
E Microsoft.PowerShell.Core\FileSystem E:\
Env Microsoft.PowerShell.Core\Environment
F Microsoft.PowerShell.Core\FileSystem F:\
Function Microsoft.PowerShell.Core\Function
HKCU Microsoft.PowerShell.Core\Registry HKEY_CURRENT_USER
HKLM Microsoft.PowerShell.Core\Registry HKEY_LOCAL_MACHINE
Variable Microsoft.PowerShell.Core\Variable
WSMan Microsoft.WSMan.Management\WSMan

From this I was able to identify the Variable PSDrive.

I was then able to change directory to the variable drive and then list the contents

cd variable:

dir

This showed the following:

Name Value
$ dir
? True
^ dir
args System.Object[]
ConfirmPreference High
ConsoleFileName
DebugPreference SilentlyContinue
Error System.Collections.ArrayList
ErrorActionPreference Continue
ErrorView NormalView
ExecutionContext System.Management.Automation.EngineIntrinsics
false False
FormatEnumerationLimit 4
HOME C:\Users\Chris
Host System.Management.Automation.Internal.Host.InternalHost
input System.Collections.ArrayList+ArrayListEnumeratorSimple
MaximumAliasCount 4096
MaximumDriveCount 4096
MaximumErrorCount 256
MaximumFunctionCount 4096
MaximumHistoryCount 4096
MaximumVariableCount 4096
my7digitalKey 7dvtxrfd7pm5
my7digitalsecret gek57mdmmqvk85cn
MyInvocation System.Management.Automation.InvocationInfo
NestedPromptLevel 0
null
OutputEncoding System.Text.SBCSCodePageEncoding
PID 26208
profile C:\Users\Chris\Documents\WindowsPowerShell\Microsoft.PowerShellISE_profile.
ps1
ProgressPreference Continue
PSBoundParameters System.Management.Automation.PSBoundParametersDictionary
PSCommandPath
PSCulture en-GB
PSDefaultParameterValues System.Management.Automation.DefaultParameterDictionary
PSEmailServer
PSHOME C:\Windows\System32\WindowsPowerShell\v1.0
psISE Microsoft.PowerShell.Host.ISE.ObjectModelRoot
PSScriptRoot
PSSessionApplicationName wsman
PSSessionConfigurationName http://schemas.microsoft.com/powershell/Microsoft.PowerS
hell
PSSessionOption System.Management.Automation.Remoting.PSSessionOption
PSUICulture en-US
psUnsupportedConsoleApplications Microsoft.PowerShell.Host.ISE.UICollection`1[Syste
m.String]
PSVersionTable System.Management.Automation.PSVersionHashTable
PWD Variable:\
ShellId Microsoft.PowerShell
StackTrace at System.Management.Automation.Internal.PipelineProcessor.Synchronou
sExecuteEnumerate(Object input, Hashtable errorResults, Boolean enumerate)
at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, Co
mmandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][] c
ommandRedirections, FunctionContext funcContext)
at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame
frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame
frame)
true True
VerbosePreference SilentlyContinue
WarningPreference Continue
WhatIfPreference False

From this the psISE looks to be the thing that I am looking for.

The next step is to inspect the object to see what I can find to use.

$psISE | gm

Name MemberType Definition
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
CurrentFile Property Microsoft.PowerShell.Host.ISE.ISEFile CurrentFile {get
;}
CurrentPowerShellTab Property Microsoft.PowerShell.Host.ISE.PowerShellTab C
urrentPowerShellTab {get;}
CurrentVisibleHorizontalTool Property Microsoft.PowerShell.Host.ISE.ISEAddO
nTool CurrentVisibleHorizontalTool {get;}
CurrentVisibleVerticalTool Property Microsoft.PowerShell.Host.ISE.ISEAddOnT
ool CurrentVisibleVerticalTool {get;}
Options Property Microsoft.PowerShell.Host.ISE.ISEOptions Options {get;}
PowerShellTabs Property Microsoft.PowerShell.Host.ISE.PowerShellTabCollecti
on PowerShellTabs {get;}

Options look promising.

$psISE.Options | gm

Name MemberType Definition
PropertyChanged Event System.ComponentModel.PropertyChangedEventHandler PropertyChanged(System.Object, System.ComponentModel.PropertyChangedEventArgs)
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
RestoreDefaultConsoleTokenColors Method void RestoreDefaultConsoleTokenColors()
RestoreDefaults Method void RestoreDefaults()
RestoreDefaultTokenColors Method void RestoreDefaultTokenColors()
RestoreDefaultXmlTokenColors Method void RestoreDefaultXmlTokenColors()
ToString Method string ToString()
AutoSaveMinuteInterval Property int16 AutoSaveMinuteInterval {get;set;}
ConsolePaneBackgroundColor Property System.Windows.Media.Color ConsolePaneBackgroundColor {get;set;}
ConsolePaneForegroundColor Property System.Windows.Media.Color ConsolePaneForegroundColor {get;set;}
ConsolePaneTextBackgroundColor Property System.Windows.Media.Color ConsolePaneTextBackgroundColor {get;set;}
ConsoleTokenColors Property System.Collections.Generic.IDictionary[System.Management.Automation.PSTokenType,System.Windows.Media.Color] ConsoleTokenColors {get;}
DebugBackgroundColor Property System.Windows.Media.Color DebugBackgroundColor {get;set;}
DebugForegroundColor Property System.Windows.Media.Color DebugForegroundColor {get;set;}
DefaultOptions Property Microsoft.PowerShell.Host.ISE.ISEOptions DefaultOptions {get;}
ErrorBackgroundColor Property System.Windows.Media.Color ErrorBackgroundColor {get;set;}
ErrorForegroundColor Property System.Windows.Media.Color ErrorForegroundColor {get;set;}
FontName Property string FontName {get;set;}
FontSize Property int FontSize {get;set;}
IntellisenseTimeoutInSeconds Property int IntellisenseTimeoutInSeconds {get;set;}
MruCount Property int MruCount {get;set;}
ScriptPaneBackgroundColor Property System.Windows.Media.Color ScriptPaneBackgroundColor {get;set;}
ScriptPaneForegroundColor Property System.Windows.Media.Color ScriptPaneForegroundColor {get;set;}
SelectedScriptPaneState Property Microsoft.PowerShell.Host.ISE.SelectedScriptPaneState SelectedScriptPaneState {get;set;}
ShowDefaultSnippets Property bool ShowDefaultSnippets {get;set;}
ShowIntellisenseInConsolePane Property bool ShowIntellisenseInConsolePane {get;set;}
ShowIntellisenseInScriptPane Property bool ShowIntellisenseInScriptPane {get;set;}
ShowLineNumbers Property bool ShowLineNumbers {get;set;}
ShowOutlining Property bool ShowOutlining {get;set;}
ShowToolBar Property bool ShowToolBar {get;set;}
ShowWarningBeforeSavingOnRun Property bool ShowWarningBeforeSavingOnRun {get;set;}
ShowWarningForDuplicateFiles Property bool ShowWarningForDuplicateFiles {get;set;}
TokenColors Property System.Collections.Generic.IDictionary[System.Management.Automation.PSTokenType,System.Windows.Media.Color] TokenColors {get;}
UseEnterToSelectInConsolePaneIntellisense Property bool UseEnterToSelectInConsolePaneIntellisense {get;set;}
UseEnterToSelectInScriptPaneIntellisense Property bool UseEnterToSelectInScriptPaneIntellisense {get;set;}
UseLocalHelp Property bool UseLocalHelp {get;set;}
VerboseBackgroundColor Property System.Windows.Media.Color VerboseBackgroundColor {get;set;}
VerboseForegroundColor Property System.Windows.Media.Color VerboseForegroundColor {get;set;}
WarningBackgroundColor Property System.Windows.Media.Color WarningBackgroundColor {get;set;}
WarningForegroundColor Property System.Windows.Media.Color WarningForegroundColor {get;set;}
XmlTokenColors Property System.Collections.Generic.IDictionary[Microsoft.PowerShell.Host.ISE.PSXmlTokenType,System.Windows.Media.Color] XmlTokenColors {get;}
Zoom Property double Zoom {get;set;}

And here we find fontsize

This gives the command that I demonstrated at the start.

The following commands were used in the construction of this article:

get-psdrive | select Name,Provider,Root | ConvertTo-Html -Fragment
dir | select Name,Value | ConvertTo-Html -Fragment
$psISE.Options | gm | select Name, MemberType, Definition | convertto-html -Fragment | clip

Powershell wmi classes

This is how to get a list of wmi providers:

Get-WmiObject -Namespace “root/cimv2” -List

These can be queried as follows:

Get-WmiObject -query “select * from win32_processor”

This is effectively granting you sql style queries against features on your machine.

7digital and powershell

The following shows how to query the 7digital api from powershell.

[xml]$data = (invoke-webrequest -uri http://api.7digital.com/1.2/release/details?releaseid=951886`&country=gb`&oauth_consumer_key=$my7digitalKey | select -ExpandProperty Content)

This provides an in memory object that you can walk the tree.

This is how I investiagate most xml/json feeds.

I am not publishing my key so get your own and set it in your profile:

ii $profile

Adding EventIds when logging to WADLogs

This is a great article on how to include an event id in the WADLogs table.

The trick is to use a custom trace source as follows

TraceSource ts = new TraceSource(“My Custom Event Source Name”, SourceLevels.Information);

ts.TraceEvent(TraceEventType.Warning, 102, “This is a test log using trace source”);

and then to configure the azure listener to get this into the appropriate log file:

This gets added to the appropriate system.diagonstics section:

<sources>

<source name=”MyTraceSource” switchName=”sourceSwitch” switchType=”System.Diagnostics.SourceSwitch”>

<listeners>

<add type=”Microsoft.WindowsAzure.Diagnostics.DiagnosticMonitorTraceListener, Microsoft.WindowsAzure.Diagnostics, Version=2.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″ name=”AzureDiagnostics”>

<filter type=”” />

</add>

</listeners>

</source>

</sources>

<switches>

<add name=”sourceSwitch” value=”Warning”/>

</switches>

The big advantage of this is that you get to assign your own error codes to the messages.

Practically all of the default Azure stuff will be coded as zero.

This means that you can assign defined ranges of code to indicate that these are for example:

Timing Messages.

Notification for information.

Notification for action.

These make analysing the logs much easier.

Btw are you aware of the WADLogs powershell trick:

“0” + [DateTime]::UtcNow.AddHours(-1).Ticks

This gives a partition key of an hour ago.

This is great for getting extracted logs.

Extract the logs into csv and use the powershell import-csv command.

This is an amazingly fast way of analysing logs.