Re: Is there something like a CD/DVD GUID and how to obtain it if yes? - C / C++ / MFC Discussion Boards

Re: How to add Image as Object on Image?

002comp11-Nov-10 17:14

002comp

11-Nov-10 17:14

Thanks For ur Reply.

Regards
Yogesh

Create Bitmap from Memory

Richard Andrew x6410-Nov-10 13:17

Richard Andrew x64

10-Nov-10 13:17

How do I obtain an HBITMAP handle to a bitmap image that I have previously loaded into a region of memory?

I want to keep the bimtap file encrypted on disk, and only decrypt it in memory.

Re: Create Bitmap from Memory

Richard Andrew x6410-Nov-10 13:42

Richard Andrew x64

10-Nov-10 13:42

After googling, I found this post:

http://www.codeguru.com/forum/showthread.php?t=475857[^]

This led me to look into GDI+, and I think that will solve the problem.

Thanks for reading my post.

Is there something like a CD/DVD GUID and how to obtain it if yes?

Code-o-mat10-Nov-10 6:00

Code-o-mat

10-Nov-10 6:00

Hello folks.

Do you know if there is anything like a GUID (Globally Unique IDentifier) for optical discs, CDs and DVDs and if yes, how would one go about retrieving this in VC++? Actually what i'd like to do is recognize the disc once it is loaded into an optical drive to e.g. have an autorun function that can be enabled/disabled per disk (program would respond on WM_DEVICECHANGE, query GUID, check against database and if enabled, autorun the disk, if not enabled, then do nothing, just an example).

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> Leela: Fry, you're wasting your life sitting in front of that TV. You need to get out and see the real world.
Fry: But this is HDTV. It's got better resolution than the real world <

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

David Crow10-Nov-10 8:29

David Crow

10-Nov-10 8:29

Code-o-mat wrote:

Do you know if there is anything like a GUID (Globally Unique IDentifier) for optical discs, CDs and DVDs...

Check out:

HKLM\SYSTEM\ControlSet001\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}

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Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Sauro Viti10-Nov-10 8:42

Sauro Viti

10-Nov-10 8:42

The key you pointed out holds informations about the CD/DVD drive... What the enquirer seems to ask for is something like an identifier of the disc

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Code-o-mat10-Nov-10 9:14

Code-o-mat

10-Nov-10 9:14

Sauro Viti's right, i meant the medium itself, not the drive.

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

David Crow10-Nov-10 9:39

David Crow

10-Nov-10 9:39

HDDs have a unique number stamped on them during manufacturing, but I'm not aware of any such thing existing for CDs and DVDs, especially those that the user creates.

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Code-o-mat10-Nov-10 9:48

Code-o-mat

10-Nov-10 9:48

Me neither, but i thought i ask, maybe someone knows better, thanks anyways for your reply.

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Chris Meech10-Nov-10 9:58

Chris Meech

10-Nov-10 9:58

Somewhat off-topic, but here's an interesting link[^] to a what happens when someone thinks they can come up with a way of uniquely identifying all CD's. Smile | :)

Chris Meech
I am Canadian. [heard in a local bar]

In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]

posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Code-o-mat10-Nov-10 10:48

Code-o-mat

10-Nov-10 10:48

Thanks for the link, just read it, it's instructive. It's easy to be smart afterwards, but i wonder why they didn't originally think of identifying discs, i mean, it's quite obvious it can be useful in certain situations. On the other hand, if i had generated a GUID and written it to a file called "DISC.GUID" in the root of every disc i ever burned then i'd be smarter now, but hey, who would ever think it could be useful sometimes in the future... Smile | :)

I wonder what alternatives there could be...like scanning the first 10 file names + file sizes and generating a hash of those, or somesuch, but such aproaches might turn out to be rather slow. The ID itself doesn't have to be unique on this planet, just around my home. Smile | :)

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Peter_in_278010-Nov-10 11:18

Peter_in_2780

10-Nov-10 11:18

Code-o-mat wrote:
The ID itself doesn't have to be unique on this planet, just around my home.

Try something like one of these[^] Poke tongue | ;-P

Software rusts. Simon Stephenson, ca 1994.

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Code-o-mat10-Nov-10 21:24

Code-o-mat

10-Nov-10 21:24

That's a good one, and damn the "programmer mind", i even started thinking how one could mount a web camera above the optical disc drive's tray and write a program that recognizes and reads the number stamped onto the disc as it passes... Laugh | :laugh:

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Luc Pattyn10-Nov-10 12:16

Luc Pattyn

10-Nov-10 12:16

This scheme might work for a limited set-up; it basically tries to identify a CD by hashing as few sectors as possible.

1. have a central database that stores one record per CD, holding a unique ID (auto assigned), a sectorCount number, and a CRC number. Also have a table that holds one number: numberOfSectors (it will start at 1, and increase monotonically over time).

2. have an app that allows to add new CDs to the system.

3. have a library that supports the recognition of known CDs.

The add-a-new-CD algorithm would be like so:

1. read first few sectors (as determined by numberOfSectors).
2. for all occurring values of sectorCount, calculate CRC, and search DB for a match.
3. if none found, simply add the new disk, and terminate.
4. if one found with sectorCount<numberOfSectors, flag it as no longer valid; add the new disk; goto 5.
5. for the flagged disks, re-process them (this will yield a new CRC over a larger number of sectors).

The recognize-a-CD algorithm would be like so:

1. read first few sectors (as determined by numberOfSectors).
2. for all occurring values of sectorCount, calculate CRC, and search DB for a match.
3. if one found, that is it.
4. if none found, this is an unknown CD, you can't handle it, you need the aad-a-new-CD algorithm.

Possible refinement:
on top of the above, you could also store the "total CRC" of a CD, so when one isn't recognized according to the above, you could still recognize it by brute force, then suggest the user officially adds it to the DB.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

modified on Wednesday, November 10, 2010 6:59 PM

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Code-o-mat10-Nov-10 21:36

Code-o-mat

10-Nov-10 21:36

Sounds reasonable, thanks, will digest it some. Thumbs Up | :thumbsup:

Re: Is there something like a CD/DVD GUID and how to obtain it if yes?

Luc Pattyn10-Nov-10 23:23

Luc Pattyn

10-Nov-10 23:23

you're welcome.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

SendMessage(WM_VSCROLL,SB_LINEDOWN,0) don't work

mesajflaviu10-Nov-10 2:06

mesajflaviu

10-Nov-10 2:06

I have an MDI application with CView based on CZoomView , based on CScrollView . In CMyView::OnKeyDown(...) I try follow :

void CMyView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default

	int x = -1;
	switch(nChar)
	{
	case VK_DOWN:
		x = SendMessage(WM_VSCROLL,SB_LINEDOWN,(LPARAM)0);
		TRACE("\n %d \n",x);
		break;
	default:
		break;
	}

	CZoomView::OnKeyDown(nChar, nRepCnt, nFlags);
}

the output of TRACE is 0 , but still the window scroll don't work ... why ?

P.S. Of course , thw window have horizontal and vertical scroll .

Re: SendMessage(WM_VSCROLL,SB_LINEDOWN,0) don't work

Adam Roderick J10-Nov-10 2:21

Adam Roderick J

10-Nov-10 2:21

Whether CMyView is derived from CScrollView?

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Re: SendMessage(WM_VSCROLL,SB_LINEDOWN,0) don't work

mesajflaviu10-Nov-10 2:54

mesajflaviu

10-Nov-10 2:54

Well , this is the project , with CMyView derived from CZoomView ... it will be a difference about this problem ?

Re: SendMessage(WM_VSCROLL,SB_LINEDOWN,0) don't work

Adam Roderick J10-Nov-10 16:54

Adam Roderick J

10-Nov-10 16:54

if CZoomView is derived from CScrollView then no problem.

Величие не Бога может быть недооценена.

OpenThemData() return Null

dhakshayani_p10-Nov-10 1:35

dhakshayani_p

10-Nov-10 1:35

Hi,

I am trying to set the treeview resemblence in listctrl. Like insert + , - symbol in some item of the listctrl. To have treeview look, i used the following code
HANDLE hTheme = OpenThemeData(m_hWnd, L"TREEVIEW");

But hTheme returns Null.

Kindly give your suggestions on this. Show some samples for using this functions.
Thanks.

Re: OpenThemData() return Null

Code-o-mat10-Nov-10 4:44

Code-o-mat

10-Nov-10 4:44

Is m_hWnd valid?

TAPI related forums...??

AmbiguousName9-Nov-10 23:37

AmbiguousName

9-Nov-10 23:37

hello guys... im doing TAPI project as my final year project. I am stuck in it. Well i've been looking for TAPI forums but could't find any. Where can I find these forums where I can post TAPI related questions?? Confused | :confused:

thnx

Re: TAPI related forums...??

Adam Roderick J10-Nov-10 1:06

Adam Roderick J

10-Nov-10 1:06

First try on MSDN([^]), if not able to solve then ask here. That's what i prefer you do.

Величие не Бога может быть недооценена.

how can fix number of lines in multiline edit box?

Le@rner9-Nov-10 22:16

Le@rner

9-Nov-10 22:16

Hi all,

i m using a multiline edit box and use enter for new line .

i want to enter only 10 lines in edit box and each line only have max 320 char.

here SetLimitText available but its set the total length of edit box.

please help for this.

thank in advance.

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