platform Win32 title bar - C / C++ / MFC Discussion Boards

How to know whether a device is connected to my USB port or not

anukampa3-Jun-05 4:58

3-Jun-05 4:58

Please help me in writing a code to know whether a webcam is attached to any USB port or not? This is very urgent

Thanking you
anukampa

Re: How to know whether a device is connected to my USB port or not

Trollslayer3-Jun-05 13:14

Trollslayer

3-Jun-05 13:14

The easiest way would probably be to use the driver for that device to check it's status.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: How to know whether a device is connected to my USB port or not

FlyingTinman3-Jun-05 14:36

FlyingTinman

3-Jun-05 14:36

If the webcam has a valid driver installed you just
need to enumerate connected video devices and look
for a "friendlyname" that matches that of your webcam.

Look at AMCAP source code (in the DirectShow SDK samples)
for details of how to do that. AMCAP enumerates all
connected video devices and lists their "friendlyname"s
in a menu from which the user can select one.

Steve T

CComboBox selection state before CBN_SELCHANGE

stevy823-Jun-05 4:24

stevy82

3-Jun-05 4:24

I need to know the Combobox selection that was before the user changed the selection.
If I use

OnChangeCbXXX() {<br />
     int selection = m_cbXXX.GetCurSel()<br />
}

then selection holds the new value. How to get the value before the change???

Re: CComboBox selection state before CBN_SELCHANGE

David Crow3-Jun-05 5:28

David Crow

3-Jun-05 5:28

Just create another member variable that defaults to -1. On the CBN_SELCHANGE handler, do something like:

OnChangeCbXXX()
{
    int selection = m_cbXXX.GetCurSel();
 
    TRACE("Previous selection = %d\n", m_prevsel);
    TRACE(" Current selection = %d\n", selection);
    
    m_prevsel = selection;
}

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Monitoring opened files

0908869039@seznam.cz3-Jun-05 3:37

0908869039@seznam.cz

3-Jun-05 3:37

How can I find out opened files on LAN ? I would like to use it in my app. I mean this Computer management->System tools->Shared folders->Open files

Re: Monitoring opened files

David Crow3-Jun-05 4:03

David Crow

3-Jun-05 4:03

See here and here for possibilities.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

platform Win32 title bar

camoguard3-Jun-05 2:51

camoguard

3-Jun-05 2:51

I have a window with a standard title bar (or caption bar) with the standard trio of Minimize, Max/Restore, and Close(SYSMENU) pushbuttons. Specifically, I have this window start maximized by sending myself a WM_SIZE message or by using the WS_MAXIMIZE style on creation. It looks great, but it isn't maximized. It can be moved by dragging the title bar, and I want the maximize button to be the restore button. More generally, I would like to know more about how to interact with a windows default title bar. I am not currently using MFCs in an effort to better understand the effort required to program for windows without MFCs. Any references to better references on the subject of title bar "maintenance" are also helpful.

Flickering

Dennis L3-Jun-05 2:29

Dennis L

3-Jun-05 2:29

Hi all!

How could I stop flickering in a list view control?

Re: Flickering

David Crow3-Jun-05 2:43

David Crow

3-Jun-05 2:43

I assume the flickering is happening while items are being added to the control. If so, try calling SetRedraw(FALSE) beforehand.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Flickering

Dennis L3-Jun-05 2:47

Dennis L

3-Jun-05 2:47

No!, it's happening when I resize the window.

CPropertySheet, WS_CHILD and hidden dialogs

LucanFahr3-Jun-05 1:45

LucanFahr

3-Jun-05 1:45

Hello people,

I'm having a very weird problem at the moment and I can't figure it out. Here's the situation;
- I have a normal dialog (CDialog class) with a groupbox on it.
- Inside the groupbox, I create a CPropertySheet like this:

CWnd* pWnd = GetDlgItem(IDC_ST_TAB);
m_propSheet.Create(pWnd, WS_CHILD | WS_VISIBLE);
m_propSheet.SetWindowPos(NULL, 0, 0, 0, 0, SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE);

where IDC_ST_TAB is the ID of the groupbox and m_propSheet is a CPropertySheet object.

- Before I call create, I add several pages. All pages show fine.
- On one of the pages contains a custom listbox, this listbox has a popup menu on right click. The popup menu shows fine.
- When an item in the popup menu is clicked, it SHOULD pop up another dialog (again a CDialog class). It does seem to load the dialog, but never shows it! It hangs on DoModal().

Now here's the weird thing; when I change the m_propSheet.Create to say WS_POPUP or just nothing instead of WS_CHILD, I get a floating property sheet and then the dialogs DO pop up properly...
What am I missing here? All property sheets are also set as child in the resource (but I don't think it matters).

Forms 2.0 ActiveX control

avs43-Jun-05 1:44

avs4

3-Jun-05 1:44

I have used a "Forms 2.0 ActiveX control" in my first piece of software created with VC++ 6.0. Unfortunalty my software will not run on a system unless MS Office is installed. What have I done wrong!!!
Can I include the nessesary files in my application to make my software run on a system without MS Office.

Thanxs

Re: Forms 2.0 ActiveX control

Cedric Moonen3-Jun-05 2:16

Cedric Moonen

3-Jun-05 2:16

Normally what you should do is supply the ActiveX with your program (but check for license and everything cause that's not my field, I'm just a programmer that don't care about licenses Wink | ;)

). Then you will need to register it using regsvr32.

Probably that this ActiveX is used by Office thus it is already installed with Office..

Re: Forms 2.0 ActiveX control

avs43-Jun-05 3:53

avs4

3-Jun-05 3:53

I thought I had!!!
The component is fm20.dll normally found in Windows\System32. It came from the Registered ActiveX Controls gallery found under "Add to project, Components and controls, ".
How should I supply the control with my program?

Thanxs, for your help. Sorry for the questions but I am new to this!

Re: Forms 2.0 ActiveX control

Cedric Moonen3-Jun-05 3:59

Cedric Moonen

3-Jun-05 3:59

avs4 wrote:
How should I supply the control with my program?

You will need to make an installation programm that will check if the ActiveX is already there or not. If not it has to copy it in Window\System32 and register it. For installation program, you can use InstallShield but I don't have a lot of knowledge there. Or of course you can also copy and register it manually but I don't know if this is a good solution Wink | ;)

By the way, fm20.dll, is not an ActiveX but a dll. ActiveX have the .ocx extention. So maybe you are looking at the wrong file...

[EDIT] Also, do you say that your application won't run. But what is happening ? Simply nothing when you start your application or do you get an error message ? [\EDIT]

Re: Forms 2.0 ActiveX control

avs43-Jun-05 4:37

avs4

3-Jun-05 4:37

When I click my icon to start the program, nothing happens, no error message, nothing. If fm20.dll is installed in the system32 directory the program runs.

It is the correct file, the control is in the VC6.0 gallery under registered ActiveX controls. The path to the control indicates "System32\FM20.DLL".

Is there no easy way to include this .DLL in my project?

Thanxs for your help.

Re: Forms 2.0 ActiveX control

Nat2423-Jan-06 14:46

Nat24

23-Jan-06 14:46

this might help...

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q224305

3D triangulation

Tender_Nail3-Jun-05 1:38

Tender_Nail

3-Jun-05 1:38

Need algorithm 3d triangulation...

Tender_Nail

Re: 3D triangulation

toxcct3-Jun-05 2:06

toxcct

3-Jun-05 2:06

Tender_Nail wrote:
Need algorithm 3d triangulation...

cool

just ask this the way you do, it will fall down from the sky... Suspicious | :suss:

-> me, i need an algorithm for taylor-young development expands... D'Oh! | :doh:

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: 3D triangulation

Cedric Moonen3-Jun-05 4:20

Cedric Moonen

3-Jun-05 4:20

Here[^]. You can really choose what you want...

Seriously, you really think that people here will supply a full code of 3D triangulation algorithm without even knowing what you are speaking about ?

If you want some help, at leat have the respect to format your question correctly.

Re: 3D triangulation

toxcct10-Jun-05 9:32

toxcct

10-Jun-05 9:32

who's the F******g guy that voted me down ?! Confused | :confused:

GRRRRRRRRRRR

hum well, don't care about me, i just have to say that, and i didn't know where to write it... so i decided to say it to my new friend, mista cedric... Big Grin | :-D

sorry for the "nuisance" (and for my bad english)... Sniff | :^)

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: 3D triangulation

Cedric Moonen10-Jun-05 11:07

Cedric Moonen

10-Jun-05 11:07

You just wake up from a sleep of one week ?? Poke tongue | ;-P

Pas de problème pour l'anglais, le mien n'est pas parfait non plus. C'est plus facile en français non Wink | ;)

Re: 3D triangulation

toxcct11-Jun-05 2:37

toxcct

11-Jun-05 2:37

ah ouais, c vrai qu'on parle francais en belgique aussi... Big Grin | :-D

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: 3D triangulation

El Corazon3-Jun-05 4:45

El Corazon

3-Jun-05 4:45

triangulation of what source? are you starting with non-uniform point data, trying to find the least number of triangles to encompass the data? Are you starting with a grid/matrix of points, but don't want to do a brute force triangle mesh? Do you have a mathematical surface or analog wave-form that you are trying to break down into a viewable/plotable 3D surface?

Without more information this is a proper answer:
//Tell gl, what our vertex arrays look like! 3 floats per vertex, 0 packing, and the address.
glVertexPointer(3, GL_FLOAT, 0, vertexcoord);
//Tell gl, what our texture arrays look like! 2 floats per coordinate, 0 packing, and the address.
glTexCoordPointer(2, GL_FLOAT, 0, texcoord);
// draw triangle strip
glDrawArrays(GL_TRIANGLE_STRIP, 0, gsize*2);

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