I've made a WPAD server Fiddler extension and in a fit of creativity I've named it: WPAD Server Fiddler Extension.
Of course you know about Fiddler, Eric's awesome HTTP debugger tool, the HTTP proxy that lets you inspect, visualize and modify the HTTP traffic that flows through it. And on the subject you've probably definitely heard of WPAD, the Web Proxy Auto Discovery protocol that allows web browsers like IE to use DHCP or DNS to automatically discover HTTP proxies on their network. While working on a particularly nasty WPAD bug towards the end of IE8 I really wished I had a way to see the WPAD requests and responses and modify PAC responses in Fiddler. Well the wishes of me of the past are now fulfilled by present day me as this Fiddler extension will respond to WPAD DHCP requests telling those clients (by default) that Fiddler is their proxy.
When I started working on this project I didn't really understand how DHCP worked especially with respect to WPAD. I won't bore you with my misconceptions: it works by having your one DHCP server on your network respond to regular DHCP requests as well as WPAD DHCP requests. And Windows I've found runs a DHCP client service (you can start/stop it via Start|Run|'services.msc', scroll to DHCP Client or via the command line with "net start/stop 'DHCP Client'") that caches DHCP server responses making it just slightly more difficult to test and debug my extension. If a Windows app uses the DHCP client APIs to ask for the WPAD option, this service will send out a DHCP request and take the first DHCP server response it gets. That means that if you're on a network with a DHCP server, my extension will be racing to respond to the client. If the DHCP server wins then the client ignores the WPAD response from my extension.
Various documents and tools I found useful while working on this:
Irritatingly out of line with what their commercials say, in my area Comcast, under the covers of the national
broadcast digital switch, is sneaking in their own switch to digital, moving channels above 30 to their own digital format. Previously, I had Windows 7 Media Center running on a PC with a Hauppauge PVR500 which can decode two television signals at once setup to record shows I like. The XBox 360 works
great as a Media Center client letting me easily watch the recorded shows over my home network on my normal TV.
Unfortunately with Comcast's change, now one needs a cable box or a Comcast digital to analog converter in order to view their signal, but Comcast is offering up to two free converters for those who'd like them. The second of my two free converters I hooked up to the Media Center PC and I got the IR Blaster that came with my Hauppauge out of the garage. I plugged in the USB IR Blaster to my PC, connected one of the IR transmitters to the 1st port on the IR Blaster, and sat the IR transmitter next to the converter's IR receiver. I went through the Media Center TV setup again and happily it was able to figure out how to correctly change the channel on the converter. So I can record now, however:
I built timestamp.exe, a Windows command line tool to convert between computer and human readable date/time formats mostly for working on the first run wizard for IE8. We commonly write out our dates in binary form to the registry and in order to test and debug my work it became useful to be able to determine to what date the binary value of a FILETIME or SYSTEMTIME corresponded or to produce my own binary value of a FILETIME and insert it into the registry.
For instance, to convert to a binary value:
[PS C:\] timestamp -inString 2009/08/28:10:18 -outHexValue -convert filetime
2009/08/28:10:18 as FILETIME: 00 7c c8 d1 c8 27 ca 01Converting in the other direction, if you don't know what format the bytes are in, just feed them in and timestamp will try all conversions and list only the valid ones:
[PS C:\] timestamp -inHexValue "40 52 1c 3b"
40 52 1c 3b as FILETIME: 1601-01-01:00:01:39.171
40 52 1c 3b as Unix Time: 2001-06-05:03:30:08.000
40 52 1c 3b as DOS Time: 2009-08-28:10:18:00.000[PS C:\] timestamp -inHexValue "40 52 1c 3b" -convert guess
40 52 1c 3b as DOS Time: 2009-08-28:10:18:00.000When I first wrote this I had a bug in my function that parses the date-time value string in which I could parse 2009-07-02:10:18 just fine, but I wouldn't be able to parse 2009-09-02:10:18 correctly. This was my code:
success = swscanf_s(timeString, L"%hi%*[\\/- ,]%hi%*[\\/- ,]%hi%*[\\/- ,Tt:.]%hi%*[:.]%hi%*[:.]%hi%*[:.]%hi",
&systemTime->wYear,
&systemTime->wMonth,
&systemTime->wDay,
&systemTime->wHour,
&systemTime->wMinute,
&systemTime->wSecond,
&systemTime->wMilliseconds) > 1;
To convert between these various forms yourself read The Old New Thing date conversion article or Josh Poley's date time article. I previously wrote about date formats I like and dislike.
Before we shipped IE8 there were no Accelerators, so we had some fun making our own for our favorite web services. I've got a small set of tips for creating Accelerators for other people's web services. I was planning on writing this up as an IE blog post, but Jon wrote a post covering a similar area so rather than write a full and coherent blog post I'll just list a few points:
There's no easy way to use local applications on a PC as the result of an accelerator or a search provider in IE8 but there is a hack-y/obvious way, that I'll describe here. Both accelerators and search providers in IE8 fill in URL templates and navigate to the resulting URL when an accelerator or search provider is executed by the user. These URLs are limited in scheme to http and https but those pages may do anything any other webpage may do. If your local application has an ActiveX control you could use that, or (as I will provide examples for) if the local application has registered for an application protocol you can redirect to that URL. In any case, unfortunately this means that you must put a webpage on the Internet in order to get an accelerator or search provider to use a local application.
For examples of the app protocol case, I've created a callto accelerator that uses whatever application is registered for the callto scheme on your system, and a Windows Search search provider that opens Explorer's search with your search query. The callto accelerator navigates to my redirection page with 'callto:' followed by the selected text in the fragment and the redirection page redirects to that callto URL. In the Windows Search search provider case the same thing happens except the fragment contains 'search-ms:query=' followed by the selected text, which starts Windows Search on your system with the selected text as the query. I've looked into app protocols previously.
I've hooked up the printer/scanner to the Media Center PC since I leave that on all the time anyway so we can have a networked printer. I wanted to hook up the scanner in a somewhat similar fashion but I didn't want to install HP's software (other than the drivers of course). So I've written my own script for scanning in PowerShell that does the following:
Here's the actual code from my scan.ps1 file:
param([Switch] $ShowProgress, [switch] $OpenCompletedResult)
$filePathTemplate = "C:\users\public\pictures\scanned\scan {0} {1}.{2}";
$time = get-date -uformat "%Y-%m-%d";
[void]([reflection.assembly]::loadfile( "C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Drawing.dll"))
$deviceManager = new-object -ComObject WIA.DeviceManager
$device = $deviceManager.DeviceInfos.Item(1).Connect();
foreach ($item in $device.Items) {
$fileIdx = 0;
while (test-path ($filePathTemplate -f $time,$fileIdx,"*")) {
[void](++$fileIdx);
}
if ($ShowProgress) { "Scanning..." }
$image = $item.Transfer();
$fileName = ($filePathTemplate -f $time,$fileIdx,$image.FileExtension);
$image.SaveFile($fileName);
clear-variable image
if ($ShowProgress) { "Running OCR..." }
$modiDocument = new-object -comobject modi.document;
$modiDocument.Create($fileName);
$modiDocument.OCR();
if ($modiDocument.Images.Count -gt 0) {
$ocrText = $modiDocument.Images.Item(0).Layout.Text.ToString().Trim();
$modiDocument.Close();
clear-variable modiDocument
if (!($ocrText.Equals(""))) {
$fileAsImage = New-Object -TypeName system.drawing.bitmap -ArgumentList $fileName
if (!($fileName.EndsWith(".jpg") -or $fileName.EndsWith(".jpeg"))) {
if ($ShowProgress) { "Converting to JPEG..." }
$newFileName = ($filePathTemplate -f $time,$fileIdx,"jpg");
$fileAsImage.Save($newFileName, [System.Drawing.Imaging.ImageFormat]::Jpeg);
$fileAsImage.Dispose();
del $fileName;
$fileAsImage = New-Object -TypeName system.drawing.bitmap -ArgumentList $newFileName
$fileName = $newFileName
}
if ($ShowProgress) { "Saving OCR Text..." }
$property = $fileAsImage.PropertyItems[0];
$property.Id = 40092;
$property.Type = 1;
$property.Value = [system.text.encoding]::Unicode.GetBytes($ocrText);
$property.Len = $property.Value.Count;
$fileAsImage.SetPropertyItem($property);
$fileAsImage.Save(($fileName + ".new"));
$fileAsImage.Dispose();
del $fileName;
ren ($fileName + ".new") $fileName
}
}
else {
$modiDocument.Close();
clear-variable modiDocument
}
if ($ShowProgress) { "Done." }
if ($OpenCompletedResult) {
. $fileName;
}
else {
$result = dir $fileName;
$result | add-member -membertype noteproperty -name OCRText -value $ocrText
$result
}
}I ran into a few issues:
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