Re: Video Conference App - C / C++ / MFC Discussion Boards

Re: static text formatting

C^hris L^osinger1-Apr-03 8:14

C^hris L^osinger

1-Apr-03 8:14

try looking here: http://www.codeproject.com/staticctrl/[^]

-c

Image tools: ThumbNailer, Bobber, TIFFAssembler

MFC + ATL

Anonymous1-Apr-03 7:52

Anonymous

1-Apr-03 7:52

I have MDI MFC+ATL app. Application supports scripting ( SmartHost etc) VbScript/Jscript.

Vb/J Script requires all calls to come from the same thread (except InteruptThread)...

Obvious solution is to create dedicated thread, this thread will waitForSingleObject(command). Once command recieved thread will execute code and return data to caller thread.
Caller thread will be blocked via semaphore or event until execution completed.

Is there a similiar com solution? Multiple callers - single thread execution?

B

Header control in ListView

rosen1-Apr-03 7:33

rosen

1-Apr-03 7:33

Hello.
I have a very preposterous problem. I have a ListView class.
Sa i want when i click on a column in the header control, an event to be manipulated in my ListView class. So i thought the clear decision is to use ClassWizard and to add a message handler for the event HDN_ITEMCLICK :
this is the method generated by ClassView

<br />
void CRegDlg::OnItemclickList1(NMHDR* pNMHDR, LRESULT* pResult) <br />
{<br />
	HD_NOTIFY *phdn = (HD_NOTIFY *) pNMHDR;<br />
	// TODO: Add your control notification handler code here<br />
	AfxMessageBox("a"); // for example<br />
	*pResult = 0;<br />
}<br />

Yes, but ... noo. When i press a header control column nothing happens ?
Why it is?
Can anyone help me.

explorer bar

mweiss1-Apr-03 7:14

mweiss

1-Apr-03 7:14

I've created an explorer bar two different ways...one way using registry settings and another using ATL and COM. Both ways show up when I click a button on the toolbar. I want to show an HTML page in the explorer bar. This is easy with the registry settings, but I need to do other processing as well, which I don't know how to do with the registry solution. The ATL COM way I don't know how to get the HTML page to show up but I can do the other processing.

My question is: does anyone know either know how to get ahold of the explorer bar that is created by the registry entries so I can do additional processing (if that's even possible)? Or can anyone give me some advice on how to show an HTML page in the explorer bar I've created using ATL COM?

Thanks for your help.

Melinda

winpcap problem

summo1-Apr-03 6:41

summo

1-Apr-03 6:41

I am trying to set the fields of the packet which I am sending using winpcap But I am unable to set the true fields of ethernet packet using winpcap.
These fields are

pcap_data[0]...........pcap_data[5] //ethernet destination address
pcap_data[6]...........pcap_data[11] //ethernet source address

I am setting in these fields with the Mac of source and destination like
1 pcap_data[0]=00;
2 pcap_data[1]=50;
3 pcap_data[0]=8D;

But line 3 is giving errors I do not know exactly what to fill I s it Hexadecimal or binary or anything else

Please help me with certain example that may be sending packet or help me in solving the problem.

Reply me soon

Video Conference App

extremalis1-Apr-03 6:38

extremalis

1-Apr-03 6:38

Hi, I am a newbie to programming. Need to program a video conference application, that sends the video from the local to the other side connected by LAN. Needs to preview the window locally as well.

I have managed to do that, using <vfw.h>, using Win32 API programming style. Only the preview i mean.

Having difficulty to get the "previewed" video to be sent over the other end, using sockets i suppose. Dun have any idea how to implement this.

I looked up Netmeeting SDK already, but am not able to make use of that, because i need to tweak my video frames when they are being sent out, according to different configurations. Thus, i have to implement my own.

On a tight schedule now, everything with the GUI needs to be done in 3 weeks time, still blur with programming. Hope some kind soul out there able to shed some light.

Thanks and regards.

p.s-> pls send email to <extremalis@catcha.com>

extremalis

Re: Video Conference App

Anonymous10-Apr-03 21:51

Anonymous

10-Apr-03 21:51

Found it on PSC:

http://www.planet-source-code.com/vb/scripts/BrowseCategoryOrSearchResults.asp?optSort=Alphabetical&blnWorldDropDownUsed=TRUE&txtMaxNumberOfEntriesPerPage=10&blnResetAllVariables=TRUE&lngWId=1&txtCriteria=netmeeting

Re: Video Conference App

extremalis14-Apr-03 3:39

extremalis

14-Apr-03 3:39

Tks for the tip. However, jus to note, this programme in VB does not include the "video streaming" codes both in the exe version and the compilable version. So its not that free afterall.

Anyway, thank you for this tip.

Resizing

User 98851-Apr-03 6:22

User 9885

1-Apr-03 6:22

I want to change the default font of a dialog run-time. Is there a comprehensive set of procedures to follow to resize the dialog, and all the controls to accomodate the change in font metrics?

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

calling a DLL in VC++

Yank11-Apr-03 6:07

Yank1

1-Apr-03 6:07

I created a VC++ app that calls a VB created ActiveX DLL, but its returns a failure when I execute the CoCreateInstance function for the COM handle.

Re: calling a DLL in VC++

geo_m1-Apr-03 7:49

geo_m

1-Apr-03 7:49

Did you call the CoInitialize or CoInitializeEx on the beginning of your application? (every thread - including main thread of the application must have initialize the support for COM subsystem to be able to use it)

Re: calling a DLL in VC++

Anonymous1-Apr-03 8:05

Anonymous

1-Apr-03 8:05

Yes, I did call the CoInitialize at the beginning of the app. Does the CoCreateInstance work differently in NT as opposed to Win2000 because when I run my app in NT, it seems to run through this step without an error message, but in Win2000 this step generates an error

Re: calling a DLL in VC++

geo_m1-Apr-03 9:19

geo_m

1-Apr-03 9:19

normally not - what exactly the CoCreateInstance returns to you as an error - this HRESULT value?

Enumerating SCSI devices?

dandy721-Apr-03 4:51

dandy72

1-Apr-03 4:51

I need to identify any and all SCSI devices attached to a system, whether it's a scanner, CDROM, hard drive, tape drive, etc.

I've been looking at:

CreateFile( "\\.\SCSIx:", ... ); // x = some int
DeviceIoControl( ..., IOCTL_SCSI_GET_INQUIRY_DATA, ... )

...however this seems to pick up all storage devices...regardless of whether the device is truly SCSI or not (ie, it'll pick up my IDE hard drives, IDE CDROM drives and even virtual IDE CDROM drives).

None of the buffers that get filled in seem to have any indicator of being a "true" SCSI device or not...

What *is* the proper way to iterate through the "real" SCSI chain from a user-mode app written in C/C++?

Re: Enumerating SCSI devices?

FoxholeWilly28-Feb-07 8:56

FoxholeWilly

28-Feb-07 8:56

Ditto and BUMP

Combo Box Owner Drawn

Anthony98871-Apr-03 4:43

Anthony9887

1-Apr-03 4:43

I'm trying to implement the compareitem and drawitem for a combobox. The compareitem is called when I call addstring, but in the drawitem i'm not getting the correct string values. Any ideas.

Thanks

Re: Combo Box Owner Drawn

Dave Bryant1-Apr-03 9:15

Dave Bryant

1-Apr-03 9:15

Can you please be a bit more specific? What are the incorrect values you are getting, and what do you expect there? What is the code you are using to draw the item?

Dave
http://www.cloudsofheaven.org

Re: Combo Box Owner Drawn

Anthony98872-Apr-03 3:56

Anthony9887

2-Apr-03 3:56

The CompareItem Function seems to work fine. I can't get the DrawItem to display the sorted data.

void CCBX::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// TODO: Add your code to draw the specified item
ASSERT(lpDrawItemStruct->CtlType == ODT_COMBOBOX);
LPSTR lpszText = (LPSTR)lpDrawItemStruct->itemData;
CDC dc;

dc.Attach(lpDrawItemStruct->hDC);
dc.DrawText(lpszText, strlen(lpszText),
&lpDrawItemStruct->rcItem,DT_SINGLELINE);
dc.Detach();
}

Thanks

Still trying to SetFocus()

ns1-Apr-03 4:08

1-Apr-03 4:08

I want to set focus in the edit part of the combobox after I select an item from a listCtrl. SO I have in:

OnItemChanged() 
{
GoToDlgCtrl(GetDlgItem(IDC_COMBO1)->GetDlgItem(1001));

When I have the mouse button clicked down (and not yet released back up) while I am in the listCtrl making my selection, the focus does go to the combo editpart. I see the cursor blinking there. The moment I release the mouse the focus vanishes, and the item I selected looks highlighted in blue. How do I make my focus stay in the combo? I even tried postMessaging from within the ItemChanged to setFocus but that didnt do it either....

Appreciate your help,
ns

Of course I had tried the m_combo1.SetFocus() too but no go..

How to Disable F1 pass to CXXApp in pop up dialog?

cadinfo1-Apr-03 3:51

cadinfo

1-Apr-03 3:51

I need a dialog to lock my app, at the same time I locked desktop, so no one can run another app, but F1 key can not disable successfully, when I press F1, it pass through my dialog and to CxxApp, which generate WM_HELP by default, I want to avoid it in this situation, How can I do it?

BOOL CLockDlg::PreTranslateMessage(MSG* pMsg)<br />
{<br />
	if(pMsg->message==WM_KEYDOWN)<br />
	{<br />
		switch(pMsg->wParam)<br />
		{<br />
		case VK_ESCAPE: return TRUE;<br />
			<br />
// This can prevent F1 pass to main window and CXXApp:wtf:<br />
//		case VK_F1:<br />
//			MessageBox("Hello");<br />
//			break;//return TRUE;<br />
		}<br />
	}	<br />
<br />
	return CDialog::PreTranslateMessage(pMsg);<br />
}<br />

Thank you in advance.;)

Best Regards

Another Design question/comment

Maximilien1-Apr-03 2:52

Maximilien

1-Apr-03 2:52

I have a collection of independant UI components, that I can place in dialogs to build more complex dialogs.

When the data from one of the component is modified, I may need to update another component.

I don't want the components to know about other component; and each component has a pointer to its parent dialog.

so, I'm doing something like this :

...
// in the component.
void SomeDerivedComponent::SomeMethodThatChangedTheComponent()
{
 m_pParentDialog->ComponentChanged(this);
}
...
// ComponentChanged is virtual and will be re-defined in parent dialogs
// where "some interaction is needed between components.
void ParentDialogClass::ComponentChanged( ComponentBaseClass* pComponent)
{

 if ( dynamic_cast<SomeDerivedComponent>(pComponent) != NULL )
 {
   // update other component(s)
 }
}

When I update the components in the parent dialog , I only pull info from the components, I don't want to have the components send/push back info to the parent either.

Does it sound ok ?

Thanks.

Maximilien Lincourt
For success one must aquire one's self

Re: Another Design question/comment

Dave Bryant1-Apr-03 9:13

Dave Bryant

1-Apr-03 9:13

It sounds okay.

As a reference, Windows controls tend to use a mixture of the approaches. When they change, or an event occurs, they send a message to their parent (meaning that the parent does not have to implement a certain interface, but may optionally handle the notification messages, normally sent as WM_COMMAND or WM_NOTIFY). Some controls just send a message saying that something changed, like a combo box sends a message saying the selection changed, without providing any information about what the selection has changed to - you need to query it. Other controls, such as a tree control, send much more information in their notify messages, often providing all the information required (such as the previously selected item, the new item, the item state etc.).

The only change i would suggest is to change the controls from using a pointer to the parent and calling a function, to sending a custom message to the parent. This will make the controls easier to reuse in another situation, because they won't be hardcoded to use a specific parent dialog.

Dave
http://www.cloudsofheaven.org

Re: Another Design question/comment

Maximilien1-Apr-03 9:39

Maximilien

1-Apr-03 9:39

Dave Bryant wrote:
The only change i would suggest is to change the controls from using a pointer to the parent and calling a function, to sending a custom message to the parent.

I wanted to do this, but I kinda' don't like Windows that much; and the derived components, are only used in those instances.

But I will try it, since it's not a big change to what I've already done, only replace the pointer by a SendMessage(...);

I also thought of using a observer pattern but that meant too much work ...

Thanks
Max.

Maximilien Lincourt
For success one must aquire one's self

Add more functions for ListBox control?

chen1-Apr-03 2:51

chen

1-Apr-03 2:51

Hi,

In adialog based application, i have a listbox for showing some
info data. Now i want to know how to add "PageUp" and "PageDown"
functions in the listbox? How to do this? Is there any reference about this?

Thanks in advance!

chen

Re: Add more functions for ListBox control?

Dave Bryant1-Apr-03 9:07

Dave Bryant

1-Apr-03 9:07

Try sending a WM_VSCROLL message to the list box (see MSDN for details on what WPARAM and LPARAM are - i can't remember off the top of my head).

Dave
http://www.cloudsofheaven.org

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.