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WMI is still awful

Trying to get some WiFi data out of WMI using Powershell. I can only get so far, then it stops working. I can get the MSNDis_80211_BSSIList object, but when I get the embedded Ndis80211BSSIList property and try to look at it Powershell reports a format error, "Not found ". This is frustrating.

Had similar issues using Outlook automation from JScript. Some COM objects you can work with, get a list of attributes and off you go. Others are unprintable. You can tell that you have one in a variable, but you can't print it, it will throw an exception.

... Link

Refactoring Get-HexDump

In Windows PowerShell In Action by Bruce Payette you find a cool script on page 315 (Listing 10.1): Get-HexDump. I wonder why he used PadLeft to make the hex numbers two characters wide, when the string format 0:x2 would do the same thing. Let's call it the pressures of the deadline.

I refactored the script, taking the guts out of the inner block. That winds up like this:

$hex = $record | hexbytes
$char = $record | readable
"$hex $char"
Hexbytes and readable are both filters:
filter readable {
  if ([char]::IsLetterOrDigit($_)) 
  {[char] $_ } 
  else {"."}
filter hexbytes {" {0:x2}" -f $_}

Took awhile to figure the whole script out. The key was realizing that -encoding byte changes Get-Content from reading lines to reading bytes (-ReadCount bytes at a time). This is a good script to study when you are learning PowerShell.

... Link

Talking Powershell

#Get Talking...
$tts = New-Object -comObject "SAPI.SpVoice"
function speak($s) {$tts.speak($s)}
speak "Hello, I am Power Shell"
speak "Too much Coffee"
speak "time to sleep"

$tts.rate=0 while ($true) { if (([datetime]::now).minute -eq 0) { speak "ding dong"; sleep 60} }

... Link

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Blog entries licensed under a Creative Commons License.

7727 days of detection
mod: 12/3/08, 5:42 AM

days of detection

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Randall Bohn lives in Orem, Utah, USA. He works as a Software Quality Engineer. He is a big fan of the AVR line of microcontrollers. He has been in the computer industry since 1989. Randall is married and has three children.

rsbohn can be reached via

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October 2023
recent updates
Arduino Starter Kit
MAKE Blog How-to Tuesday posted a challenge: Optimize the sketch code for a pressure sensor bar graph. Here is my second attempt: int gate[] = {10, 20, 50, 100, 200, 32767}; void setup() {DDRB = 0b00111110;} void loop() { int dval = 0; int rval = analogRead(2); for (int x = 0; rval...
12/3/08, 5:42 AM
Measuring Supply Voltage
I'm running my latest handheld computer on solar power. It starts up when the sun rises and runs all day. I started wondering how I could measure the voltage coming in from the solar panel. I came up with a way to use a diode and a resistor and the...
7/29/08, 9:53 AM
Ten Pin ISP adapter
I've already built a six pin ISP adapter, but my Olmex cards use the ten pin ISP. I put a header on a scrap of perf board, added an LED for the heartbeat, and then connected the ten pin cable. Actually it is a fifteen pin cable, off a joystick...
7/16/08, 10:00 PM
Hello 5x7 Style
Wrote a new firmware for the 5x7 display. Now it scrolls out 'hello' over and over again. I'm running it on a solar panel, so it wakes up with the sun and runs all day long. When I built the LED matrix I put resistors on the five columns. I'm starting...
6/17/08, 12:48 PM
Provo, Utah
With a walkable downtown and access to two Universities, Provo Utah is a great location. I live next door in Orem. Kipplinger: Provo: Pristine Tech Mecca (Video) (Text)
6/2/08, 10:07 AM
Another release of AVRISP sketch
There is a new release of the AVRISP emulation sketch for Arduino: This one should work with Mega8 and Mega168. mega-isp
5/28/08, 4:48 PM
Sorting Out Page Sizes
There is a new release of AVRISP Emulation for Arduino. This is an Arduino firmware that allows you to program other AVR microcontrollers. The new zip file ( should compile on the current Arduino IDE, and I changed the comments that put the wrong labels on the SPI pins. Go ahead...
5/27/08, 11:31 AM
Flash Problems
I'm building a project using the AVR ATMega8 microcontroller. Once I got the thing wired up to where I could write firmware to it I found that it was always failing. I made a .hex file full of 0x10 values (256 bytes worth) and tried uploading that to the chip....
5/16/08, 2:56 PM
William's Arduino Board
I'm building an Arduino-compatible board for William. I'm building it on the Evil Mad Scientist MegaXX8 business card. It will have four built-in LEDs and a USB interface. It will also have connectors so he can use it with a breadboard. Perhaps we can connect it to some of his...
5/15/08, 7:26 AM
Cybord Signal Detector
Some digital radio signals use Frequency Shift Keying (FSK). This often has one frequency for a Mark and one for a Space. I plan to build a cybord or other chip that will decode an FSK signal, producing three different values: NO_SIGNAL, MARK, and SPACE. The signals would then go...
5/15/08, 7:20 AM


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