C / C++ / MFC

Re: Beep/Audio without speakers using VC++.Net

19-Jul-08 20:50

Hi Aniket,

I think you should try using the MessageBeep[^] function.

Best regards,
Mihai Moga

CPallini20-Jul-08 22:09

CPallini

20-Jul-08 22:09

Aniket Salunkhe wrote:
I used Beep(freq,mili_secs) to generate a beep from motherboard.Will it work without sound card installed on system?

Yes, provided your system satisfy function requirements [^].

Aniket Salunkhe wrote:
And how to know diffrent frequencies?

Documentation states that frequency maybe genrated in the "37 through 32,767" Hz range.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Newbie question, handling form focus messages

kensai19-Jul-08 10:45

kensai

19-Jul-08 10:45

I have a problem with MDI forms. An MDI form in my application sets focus to a control on it(also scrolls to its location) when the form is clicked/activated/focused. I'm looking a way to prevent it. This is actually a C# application and I have no C++/WinApi knowledge. I tried Spy++ and checked messages it recieves when the mdi form is activated and when this problem occurs. I saw several messages like WM_FOCUS and such. I checked the message number, e.g 0022, and overriden WndProc function of the mdi form and tried to handle it like "if(m.Msg == 0022 || m.Msg == 22)return" for all of the messages includes word "focus" but this didn't do any good. I don't know what else I can do.

This is actually a .NET question I posted here but I thought maybe someone with C++/WinApi knowledge could help me with this. It's driving me insane and I appreciate any help.

No avi file has been stored, when Capturing Video to a File

dwk0019-Jul-08 3:34

dwk00

19-Jul-08 3:34

Hi,

Preview works,
Capture does not work at
//

Problem: RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pBuild, NULL, pMux)

Please help.

void CWebCamDlg::OnStart()
{
// TODO: Add your command handler code here

UpdateData();
IGraphBuilder *pGraph2;
IMediaControl *pControl2;
IVideoWindow *pVidWin3;
ICaptureGraphBuilder2 *pBuild2;

hr =CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,IID_IGraphBuilder, (void**)&pGraph2);

pGraph2->QueryInterface(IID_IMediaControl, (void **)&pControl2);

///////////////////////////////////////////////////////////////////////////////////////////////

hr =CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER,IID_ICaptureGraphBuilder2,(void**)&pBuild2);

pGraph2->QueryInterface(IID_IVideoWindow, (void **)&pVidWin3);

hr = pBuild2->SetFiltergraph(pGraph2);

//hr = pGraph2->AddFilter(pBase, L"Capture Filter");

IBaseFilter *pMux;

//CoCreateInstance(CLSID_AviDest, 0, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pMux);

//pGraph2->AddFilter(pMux, L"AVI MUX");

IBaseFilter *pWriter;

CoCreateInstance(CLSID_FileWriter, 0, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pWriter);

hr =pBuild2->SetOutputFileName(&MEDIASUBTYPE_Avi,L"c:\\dwk.avi",&pMux,0);

////////////////////////////////////////////////////////////////////////
//prolbem
//pBase from preview

hr = pBuild2->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pBase, NULL, pMux);

//////////////////////////////////////////////////////////////////////////

pControl2->Run();
pVidWin3->put_Owner((OAHWND)m_hWnd);
pVidWin3->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);

CRect rc;
GetWindowRect(rc);
ScreenToClient(rc);

pVidWin3->SetWindowPosition(0, 0, rc.Width(), rc.Height());

// Release the mux filter.
pMux->Release();

IConfigAviMux *pConfigMux = NULL;

pMux->QueryInterface(IID_IConfigAviMux, (void**)&pConfigMux);

pConfigMux->SetMasterStream(1);
pConfigMux->Release();

IConfigInterleaving *pInterleave = NULL;

pMux->QueryInterface(IID_IConfigInterleaving, (void**)&pInterleave);

pInterleave->put_Mode(INTERLEAVE_CAPTURE);
pInterleave->Release();
}

Please Help!
Thanks

How to assign a same icon id to different files programatically?

Priya_Sundar19-Jul-08 1:18

Re: How to assign a same icon id to different files programatically?

19-Jul-08 1:18

Hi,

I am using two differnt applications within one project in vc++.

For these I want to load two different application icons. However i dont want to another icon id. I want to use this same icon id. The reason is because i have all my menus,etc with this id. So i want to have this id but pointing to two differnt resource files, which would be decided in the compile time.

How to use/point a icon id to two different files programatically?

Priya Sundar

Joe Woodbury19-Jul-08 8:57

Joe Woodbury

19-Jul-08 8:57

I don't understand the problem. Just make sure you assign the same values in the resource.h file.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Need algorithm to find paths

Member 465568519-Jul-08 1:14

Member 4655685

19-Jul-08 1:14

Hi for eg assume we have 5 nodes
and need to travel from 1 to 2 we will get total 16 paths i need all those paths
i have writtn for that but that is time consuming if u have any good logic plz suggest

Re: Need algorithm to find paths

CPallini19-Jul-08 9:45

CPallini

19-Jul-08 9:45

Looks similar to Travelling Salesman Problem [^]. An amusing algo maybe the Simulated Annealing [^] one.
Smile | :)

Precendece warning Message!

Priya_Sundar18-Jul-08 23:21

18-Jul-08 23:21

Hi All,

I have this global variable declared as in the below statement:

const LONG MYITEMID = MAKELONG(MAKEWORD('m','i'),MAKEWORD('d','0'));

Here when i try to build this i am getting the warning displayed 3 TIMES:

W8084 Suggest parentheses to clarify precedence

Can anyone tell me how to resolve this?

I have tried all types of typecasting.. but it didnt work.

Kindly help!

Priya Sundar

Ștefan-Mihai MOGA18-Jul-08 23:46

18-Jul-08 23:46

Hi Priya,

this is a Borland C++ warning, and it works well under Visual C++ (no error). If you would like to skip this please put # pragma warn -8084.

Best regards,
Mihai Moga

Priya_Sundar19-Jul-08 0:30

19-Jul-08 0:30

Hi Moga,

You are right. it is a Borland c++ warning message.

But do you know why is this message coming for this sort of statement?

Thanks for the help. After putting that statement now it is working fine.

Priya Sundar

Ștefan-Mihai MOGA19-Jul-08 0:34

19-Jul-08 0:34

Hi Priya,

I'm not familiar with Borland C++, so I cannot answer to your question. Sorry!

Best regards,
Mihai Moga

Priya_Sundar19-Jul-08 0:43

19-Jul-08 0:43

No probs, thankyou.

Also i found this link...

http://www.koders.com/c/fid299C4BC1FEA418784068F7BF835B26FBDB9C2852.aspx?s=cdef%3Aparser[^]

Check it out too...

Priya Sundar

David Crow19-Jul-08 11:10

David Crow

19-Jul-08 11:10

Priya_Sundar wrote:
const LONG MYITEMID = MAKELONG(MAKEWORD('m','i'),MAKEWORD('d','0'));

Here when i try to build this i am getting the warning displayed 3 TIMES:

W8084 Suggest parentheses to clarify precedence

Have you considered looking at how the preprocessor is expanding that statement? It might help you to see it in a different light.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

List Control in MFC

AnithaSubramani18-Jul-08 19:42

AnithaSubramani

18-Jul-08 19:42

Hi All,

Im using List Control in my project. I have implemented the background color and text color of List Control.Everythig is working fine. But dint change the background color of header.How can i set the background color for header. Help me.

Thanks & Regards,

Anitha

Re: List Control in MFC

Ștefan-Mihai MOGA18-Jul-08 21:44

Re: tab control with dialogs

18-Jul-08 21:44

Hi Anitha,

in order to change the background color of the CListCtrl's header you need to customize the header control. Please have a look to Matt Weagle's Using the Header Control[^] article. This should do it for you.

Best regards,
Mihai Moga

tab control with dialogs

ani_ikram18-Jul-08 19:33

ani_ikram

18-Jul-08 19:33

OnSelChange event of tab control i want to show a dialog
that dialog should with in the tab control (unable dialog move)
how can i set locatoin of dialog programatically ?

CTabCtrl *t=(CTabCtrl*)GetDlgItem(IDC_TAB1);
t->insertItem(0,"one");
t->insertitem(1,"two")

Rajesh R Subramanian18-Jul-08 22:00

Rajesh R Subramanian

18-Jul-08 22:00

Have you tried CTreePropSheetEx[^]?

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

How often should you seed a random number generator?

Sauce!18-Jul-08 19:30

Sauce!

18-Jul-08 19:30

When using rand() from the standard cstdlib include files, how often should you seed the number generator?

Do you need to seed every time you use the rand() function, or just once at the start of the application?

Also, is srand((unsigned)time(0)); adequate for seeding purposes, or is something more complex a better idea?

Re: How often should you seed a random number generator?

bob1697218-Jul-08 19:36

bob16972

18-Jul-08 19:36

Once. Otherwise you could seed it with the same time value which would result in the same number multiple times which is probably not what you wanted.

Add menu in ChilFrame.

lavate malllik18-Jul-08 19:26

lavate malllik

18-Jul-08 19:26

Iam having a MDI application.
I have two queris.
1. How to add the menu in childframe
2. For different child how i can add the different menu.

Thanks in davance.

Regards
Lavate Mallikarjun Avanna

Re: Add menu in ChilFrame.

Nelek20-Jul-08 21:29

Nelek

20-Jul-08 21:29

In one project I used different Views with different Menus according to which was the active one. I did it creating the menus in the resource editor and then in the MyApp files (.h and .cpp) creating different CMultiDocTemplate one for each type of view, saying which menu was owned by which view.

BOOL CFPSApp::InitInstance()
{
	AfxEnableControlContainer();

.
.
//more code
.
.
//Main window menu
	pDocTemplate = new CMultiDocTemplate(
		IDR_FPSIITYPE,
		RUNTIME_CLASS(CFPSDoc),
		RUNTIME_CLASS(CChildFrame),		// Benutzerspezifischer MDI-Child-Rahmen
		RUNTIME_CLASS(CFPSView));
	AddDocTemplate(pDocTemplate);
.
//One of the child menu
	pParamRegMatTemplate = new CMultiDocTemplate(
		IDR_VIEWTYPE,				//Special menu for the view
		RUNTIME_CLASS(CFPSDoc),
		RUNTIME_CLASS(CChildFrame),		//Some special features for the view
		RUNTIME_CLASS(CParamRegView));		//View for the Regler
	AddDocTemplate(pParamRegMatTemplate);
.
//More code
}

this option is good when you know for sure how your project is going to be structured. There are other options to load/unload menus dinamically. If you use it you will have to load/unload the menu in the OnInitialUpdate and when your view loses and wins the focus another time. With the other way I have explained all is done automatically.

Regards.
--------
M.D.V. Wink | ;)

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Mullti line in combobox

sheshidar18-Jul-08 18:42

sheshidar

18-Jul-08 18:42

Hi
is it possible to show a single item's text in multiple line in a combo box?
Thanks

Re: Mullti line in combobox

Ștefan-Mihai MOGA18-Jul-08 21:50