Hardware & Devices

5-Oct-09 10:58

hande54 wrote:
how can I benefit from this log file?
Quote Selected Text

It depends on what problem you are trying to solve. Packet sniffers sometimes have filter options to allow you to reduce the amount of low level protocol information and highlight the actual data that you are interested in. The documentation often has information that may help.

Re: Read data from usb

hande545-Oct-09 11:32

hande54

5-Oct-09 11:32

I would like to get data measurement results from the blood pressure meter which has a usb gateway. It has software to list values in txt format. but what I need to do is read data directly from the usb.

Re: Read data from usb

Richard MacCutchan5-Oct-09 11:35

WM_DEVICECHANGE message with monitor

5-Oct-09 11:35

hande54 wrote:
It has software to list values in txt format. but what I need to do is read data directly from the usb.

I don't see why you want to make it so difficult for yourself. However, if this is the route you decide on then you will need to get hold of the technical documentation for your BP device to decode its output.

keancaptinh4-Oct-09 16:40

keancaptinh

4-Oct-09 16:40

Dear,
I have a problem,
I'm coding a application with multiple monitor.I use MFC ( VS 2003)
I used to WM_DEVICECHANGE to catching event when plug/unplug monitor.
With my computer, when i unplug monitor, it doesn't go to OnDeviceChange() function Sigh | :sigh:

But with other computers, when i unplug monitor, it go to OnDeviceChange() function Sigh | :sigh:

I don't know why ?
How to catching event when plug/unplug monitor ?

Thank you for your help

Re: WM_DEVICECHANGE message with monitor

Indivara30-Oct-09 4:50

Indivara

30-Oct-09 4:50

It looks like you are going about it the correct way
http://stackoverflow.com/questions/1437634/can-windows-detect-when-a-monitor-mouse-keyboard-is-disconnected[^]
http://www.dotnet247.com/247reference/msgs/32/164968.aspx[^]

My guess is, the hardware on your computer doesn't notify the system (via the driver?) when the monitor is unplugged, so naturally there is no way the message will be broadcast. If this is the case (and I'm no expert), it will be impossible to detect.

Reading the Intel Firmware Hub RNG

ChrisBosch28-Sep-09 1:41

28-Sep-09 1:41

Hi all,

I'm trying to access the RNG on the Intel 82802 Firmware Hub

As in the document:
Intel
82802 Firmware Hub:
Random Number Generator
Programmer’s Reference Manual
December 1999
Order Number: 298029-001

I'm stuck at accessing memory outside my code, as my code throws Access violation errors when I try to read from the feature space memory:

<br />
   unsigned char *pFeatureSpace;<br />
   unsigned char *pHardwareStatus;<br />
   __int64 val;<br />
<br />
   val = 0xFFBC0000;<br />
   pFeatureSpace = (unsigned char*)val;<br />
   pHardwareStatus = pFeatureSpace + 0x015F;<br />
   if ( (*pHardwareStatus & 0x40) != 0) // Throws Access violation<br />
   {<br />
      val = 1;<br />
   }<br />
   else<br />
   {<br />
      val = 0;<br />
   }<br />
	return val;<br />

Could anyone point me in the right direction as to how to read from this hardware?

Richard MacCutchan28-Sep-09 4:00

28-Sep-09 4:00

I can't be certain of this, but I don't think Windows will let you read/write to memory addresses that are outside of the address space of your program. You will need some way of getting the memory starting at 0xFFBC0000 mapped so that you are allowed access to it.

Dave Kreskowiak28-Sep-09 4:53

Dave Kreskowiak

28-Sep-09 4:53

You cannot do this in user code. You have to write a .DLL or other device driver that runs in Ring 0 and provides the data to your app. Welcome to the wonderful world of NT Kernel programming!

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

ChrisBosch29-Sep-09 1:04

29-Sep-09 1:04

I was afraid of this. But I'm not even in with the lingo yet - the Ring 0 idea gets me googling further - thanks. Any good guides out there for DLL writing and getting to Ring 0 / NT Kernel programming?

I may have bumped into this problem before in 2002, trying to get data from the ECP port really fast. I ended up abandoning Windows XP and got a linux system up and running, through which I got everything done, but I had to learn Linux in the process so I'm sure it's the same effort to just figure out NT Kernel programming.

Dave Kreskowiak29-Sep-09 2:06

Dave Kreskowiak

29-Sep-09 2:06

ChrisBosch wrote:
Any good guides out there for DLL writing and getting to Ring 0 / NT Kernel programming?

Not that I know of, but then again, i haven't had the need for about 7 years now. You might want to ask the same question in here[^].

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

ChrisBosch29-Sep-09 2:37

29-Sep-09 2:37

Thanks Dave! Smile | :)

Randor 30-Sep-09 0:01

Randor

30-Sep-09 0:01

Hi Chris,

Actually... I think it is possible to read this physical address from usermode without writing a device driver on Windows XP SP2 and below. You would need to rely on some unsupported and fairly undocumented ~~techniques~~ hacks to achieve this however. You could start by researching Device\PhysicalMemory and NtOpenSection[^].

An even better solution would be using a device driver such as WinIO [^]to map the physical memory into your process. WinIO comes with full source code.

Best Wishes,
-David Delaune

ChrisBosch30-Sep-09 20:13

What's the criteria for detecting a replaced CD? (Windows)

30-Sep-09 20:13

Hey now there sounds like an idea - I'll look it up and let you know what I get going - unfortunately as pet projects go I can't deliver lightning fast results - work and social life somehow take preference... Smile | :)

But I'll definately come back here with a working piece of code hopefully other people can use this hardware RNG through our findings.

Also will have to look at how fast I can get random samples from the device - I expect it to be slowish, but one could definately incorporate the input into a psuedorandom sequence to yied hopefully superior results.

I'll get back to you guys. Smile | :)

for privacy

beenabusedforever0023-Sep-09 10:11

beenabusedforever00

23-Sep-09 10:11

Can somebody please tell me what to do about administrator password.
This pc was purchased from Costco as open box item and somehow it's
showing that there is an existing administrator code. I'm concern about
the privacy safety if I can't fix this issue.

God bless to you all...

Re: for privacy

Dan Neely23-Sep-09 10:55

Dan Neely

23-Sep-09 10:55

Assuming the password to the account is non-blank, there're bootable CDs with command line tools that will allow you to write a new password for an existing windows account.

The latest nation. Procrastination.

kakan23-Sep-09 0:04

kakan

23-Sep-09 0:04

Hello.

My program burns CD's/DVD's. Those CD/DVD's are sent out to a lot of receivers, countrywide. Now, I've got error reports from some people who claims that the two CD's they got is identical to eachother. That is not the case.

The CD's in question got the same volume label, the same anount of files, with identical file names.
But the content of the files differ.

When the receiver has read the first CD, ejects it and puts in CD No 2, the information doesn't change (due to the fact that the driver cdrom.sys doesn't notice the changed CD, I guess). And the content of the files (from the first CD) seems cached, so the user sees the files from CD No 1, despite the fact that CD No2 is inserted.
F5 doesn't help, since the file system doesn't become refreshed.

If the user reads a completely different CD between "my" CD's, the file system is refreshed and the information is correct.

My question:
What's the criteria (in cdrom.sys) for detecting a replaced CD in the CD-ROM drive? Different volume label, or what?
This problem drives "my CD readers" go nuts, and then it hits me...

TIA.

Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson

modified on Wednesday, September 23, 2009 6:19 AM

Re: What's the criteria for detecting a replaced CD? (Windows)

Richard MacCutchan23-Sep-09 0:42