C / C++ / MFC

Re: making simple DVD Player using API

31-Jan-07 11:31

Hi Khoramdin,

I made a VS 2005 Express project/solution and sent it to you.

You may want to remove your email address from your last message so you don't get extra spam Smile | :)

Mark

Khoramdin31-Jan-07 17:54

Khoramdin

31-Jan-07 17:54

Hello Mark,

Thank you so much for all the help and the information.

I am going to take sometimes to check these and hopfully be able to build a DVD-Video Software Application.

I hope you don't mind me bothering you once in a while when I cannot make sense out of some of the stuff.

Thank you very much and have a great day.

Babak

CTreeCtrl question, selecting/unselecting

Maximilien29-Jan-07 10:11

Maximilien

29-Jan-07 10:11

( with VC6, MFC, and using the CMultiTree class from the CodeGuru site which support multiselection )

I have a large-ish complex tree hierarchy. Each leaf item in the tree has pointer to its corresponding "object".

Each of those object knows when it's selected or not; i.e. I can select objects in other UI parts of the application, and the selection must be reflected in the tree.

Now, I will loop everything to do a SetItemState( hItem, 0, TVIS_SELECTED ); on all items to deselect them. followed by another SetItemState( hItem, TVIS_SELECTED, TVIS_SELECTED ); to actually select the items.

This is not very effective.

I'm looking for better suggestions.

I've been trying to store each object's HTREEITEM item in the object itself to be able to change the state directly on the items. but that means the Tree must be known ( in some fashion ) to others unrelated places in the software.

I also tried to completly "override" the tree selection mechanism and keep it "external" to the tree itself, and use CustomDraw ( NM_CUSTOMDRAW ) on the tree to manage the selected state of the objects, but that causes other kind of side effects, mostly bad refresh and flickering and some selection management issues.

Any other ideas ?

Thanks

M.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: CTreeCtrl question, selecting/unselecting

Rage29-Jan-07 21:42

Rage

29-Jan-07 21:42

Maximilien wrote:
I've been trying to store each object's HTREEITEM item in the object itself to be able to change the state directly on the items. but that means the Tree must be known ( in some fashion ) to others unrelated places in the software.

This is what I usually do, with the disadvantages you describe. I have a layer (a class) between the TreeCtrl and the Data, which contains only a pointer Data and the HTREEITEM.

Dynamic CSplitterWnd

neilsolent29-Jan-07 8:41

neilsolent

29-Jan-07 8:41

I have created a dynamic splitter with:

CSplitterWnd clientSplitter;
..
clientSplitter.Create(this, 2, 2, CSize(200, 200), pContext, WS_CHILD | WS_VISIBLE | SPLS_DYNAMIC_SPLIT, AFX_IDW_PANE_FIRST);

How do I add a view to it? This code ..

clientSplitter.CreateView(0, 0, RUNTIME_CLASS(CLeftView), CSize(100, 100), pContext);

.. causes an ASSERT.

cheers,
Neil

Mark Salsbery29-Jan-07 9:04

29-Jan-07 9:04

And the assertion is....?

neilsolent29-Jan-07 9:10

neilsolent

29-Jan-07 9:10

Sorry, assertion is in WINSPLIT.CPP:

if (GetDlgItem(IdFromRowCol(row, col)) != NULL)
{
TRACE2("Error: CreateView - pane already exists for row %d, col %d.\n",
row, col);
ASSERT(FALSE);
return FALSE;
}

cheers,
Neil

Mark Salsbery29-Jan-07 9:43

29-Jan-07 9:43

A dynamic splitter creates the first default pane (cell 0,0) so you can't create another view
there.

You may need to use DeleteView() on that pane first before adding your own pane.
I'd have to test this as I've only used static splitters.

Mark

Mark Salsbery29-Jan-07 10:58

29-Jan-07 10:58

I got around to testing it. This should work...

BOOL CMyFrameWnd::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
   CCreateContext CreateContext;
   CreateContext.m_pCurrentFrame = this;
   CreateContext.m_pNewViewClass = RUNTIME_CLASS(CLeftView);
 
   clientSplitter.Create(this, 2, 2, CSize(200, 200), &CreateContext, 
                          WS_CHILD | WS_VISIBLE | SPLS_DYNAMIC_SPLIT, AFX_IDW_PANE_FIRST);
 
   return TRUE;
}

How to produce a +5V TTL signal on COM port?

neilsolent1-Feb-07 6:17

neilsolent

1-Feb-07 6:17

Thanks. That works fine.

cheers,
Neil

pavanbabut29-Jan-07 8:11

29-Jan-07 8:11

Hi,

I am wondering if there is any way to produce a +5V clean TTL signal through COM/RS-232 serial port in C++. I just need to produce a clean +ve spike over the serial port.

thanks,
-Pavan.

James R. Twine29-Jan-07 8:26

James R. Twine

29-Jan-07 8:26

   You mean other than putting a power regulator/converter to translate +12 to +5? I have never tried to pull constant power from a COM port and I do not know how much current it can source.

   A good project site can be found at: http://www.epanorama.net/links/project_interfacing.html[^].

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
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pavanbabut29-Jan-07 8:39

29-Jan-07 8:39

To be clear, I just need to produce a signal which will have a spike (think of it as a trigger) whenever I like. This is fed to another signal recorder which keeps looking at this signal for any trigger (spike) and records it.

-Pavan.

malaugh29-Jan-07 8:40

malaugh

29-Jan-07 8:40

The RS-232 port has +12v or -12v logic levels. The parallel port has 5v logic levels.

pavanbabut29-Jan-07 8:51

29-Jan-07 8:51

Ok, how can I produce a signal of +12v spike using for example this[^] library??

-Pavan.

jeron129-Jan-07 9:34

jeron1

29-Jan-07 9:34

You can try the EscapeCommFunction() and set/clear the DTR or RTS line.

malaugh29-Jan-07 10:22

malaugh

29-Jan-07 10:22

Have not tried it, but you should be able to open the commport with

Handle = CreateFile("Com1",....);

then set and clear the DTR line with

GetCommState(Handle, &Dcb);

Dcb.fDtrControl = DTR_CONTROL_DISABLE;
SetCommState(Handle, &Dcb);

Dcb.fDtrControl = DTR_CONTROL_ENABLE;
SetCommState(Handle, &Dcb);

You should be able to use simlar code to toggle the RTS bit

pavanbabut29-Jan-07 13:13

29-Jan-07 13:13

I have tried enabling and disabling DTR and also RTS bit, but couldnt see any spike signal on the Oscilloscope?? I have connected pin 4 and pin 5(ground) for DTR bit to the scope and 7,5 for RTS bit. I didn't see any change in the signal (stays flat at zero all the time).

-Pavan

jeron130-Jan-07 5:38

jeron1

30-Jan-07 5:38

Can you post some code for the things you have tried?

pavanbabut30-Jan-07 6:05

30-Jan-07 6:05

Ok, I am getting it. Just played around with the output pins using a LED. The signal goes from -11.6v to +11.6v. Inorder to get a TTL signal, it seems we need to use a voltage converter MAX-232(source:- codeguru forums). Do you know any other way to produce a TTL type signal (0-5v) other than using that converter? I am not sure we can produce without using that, but in case if have any idea lemme know.

Thanks for the info,
-P.