C / C++ / MFC Discussion Boards

Re: How to get "MAC Number"?

Joseph Marzbani28-Nov-08 10:38

Joseph Marzbani

28-Nov-08 10:38

Thank you. you're so kind. Rose | [Rose]

Re: How to get "MAC Number"?

Jijo.Raj28-Nov-08 12:36

Jijo.Raj

28-Nov-08 12:36

Jusef Marzbany wrote:
Thank you. you're so kind. Rose

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: How to get "MAC Number"?

Code-o-mat28-Nov-08 10:09

Code-o-mat

28-Nov-08 10:09

Do you mean this: http://en.wikipedia.org/wiki/MAC_address[^]? If you do, a MAC address belongs to the network card in the computer (can also belong to a modem or other network-connected device), so if a computer has no network card it has no MAC address either, also if you change the network card (like, you buy a new one) you get a new MAC address, also these can be spoofed. Don't know if this applies to your case or not or if this is usefull information for you or not, but i thought i mention it, maybe it helps some way to clear up possible misunderstandings. Good luck with whatever you are doing. Smile | :)

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: How to get "MAC Number"?

Joseph Marzbani28-Nov-08 10:36

Joseph Marzbani

28-Nov-08 10:36

Sometimes, I don't know how do I aprociate. You're so kind. thank you.

How to Initializing CString in constructor

krishnakumartm28-Nov-08 8:35

krishnakumartm

28-Nov-08 8:35

Hi

I have a CString variable in my class like bellow i want to initialize it to nothing which way is best
Here i listed two ways. If any way is best why?

class MyClass
{
CString name;

MyClass()
{
name = _T(""); //way 1
name.Empty(); //way 2
}

}

Thanks in advance

----------------------------
KRISHNA KUMAR T M

Re: How to Initializing CString in constructor

Maximilien28-Nov-08 8:50

Maximilien

28-Nov-08 8:50

what about

MyClass() : name(_T(""))
{
}

Re: How to Initializing CString in constructor

Code-o-mat28-Nov-08 8:53

Code-o-mat

28-Nov-08 8:53

As far as i know CString's default constructor initializes it to an empty string anyways, so you don't have to do that explicitly. Or am i wrong?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: How to Initializing CString in constructor

Mark Salsbery28-Nov-08 9:11

Mark Salsbery

28-Nov-08 9:11

Code-o-mat wrote:
CString's default constructor initializes it to an empty string anyways, so you don't have to do that explicitly.

Indeed!

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Is Window / Dialog neede for a UI thread

vipin_nvk28-Nov-08 6:45

vipin_nvk

28-Nov-08 6:45

Hi
Can I write a windows service and create a UI thread in it which should be able to identify / receive windows messages and process them? Is a window / dialog needed for a UI thread so that it can handle windows messages?

Thanx

Re: Is Window / Dialog neede for a UI thread

Code-o-mat28-Nov-08 9:00

Code-o-mat

28-Nov-08 9:00

Well, window messages can only be sent to a window so you will actually need one to receive window messages. But you can run a message queue in a thread that has no windows in it and handle process/thread messages (which aren't directed towards any particular window).

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: Is Window / Dialog neede for a UI thread

Peter Weyzen28-Nov-08 20:24

Peter Weyzen

28-Nov-08 20:24

You can associate a hidden window with a service.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<a href="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</a>

Re: Is Window / Dialog neede for a UI thread

vipin_nvk28-Nov-08 23:47

vipin_nvk

28-Nov-08 23:47

Hi
Is it possible to associate a hidden window with a service, moreover it is generally advised not to write interactive services (which have windows) and not use MFC support for windows services. So, how do I proceed?

Thanx

Re: Is Window / Dialog neede for a UI thread

Peter Weyzen29-Nov-08 8:32

Peter Weyzen

29-Nov-08 8:32

true... interactive services are become less viable in the newer versions of windows.

So, to have some sort of UI that controls your service, you'll could write a 2nd program which interacts with the service and serves as it's UI. You can use FindWindow to get the window to post messages to. There are other ways to communicate with a service that doesn't involve a window -- named pipes, tcp, mailslots, stuff like that.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<a href="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</a>

How to pass command line parameters using CreateProcess function.

SNI28-Nov-08 2:08

SNI

28-Nov-08 2:08

Hi, I have a application and I would like to command lien pass parameters to it. But in other exe this command line parameter is null.

STARTUPINFO SI;
PROCESS_INFORMATION PI;
SI.cb = sizeof(STARTUPINFOW);
SI.lpReserved = NULL;
SI.lpDesktop = NULL;
SI.lpTitle = NULL;
SI.dwX = CW_USEDEFAULT;
SI.dwY = CW_USEDEFAULT;
SI.dwXSize = CW_USEDEFAULT;
SI.dwYSize = CW_USEDEFAULT;
SI.dwXCountChars = 0;
SI.dwYCountChars = 0;
SI.dwFillAttribute = 0;
SI.dwFlags = STARTF_USESHOWWINDOW;
SI.wShowWindow = SW_SHOWNORMAL;
SI.cbReserved2 = 0;
SI.lpReserved2 = NULL;
SI.hStdInput = 0;
SI.hStdOutput = 0;
SI.hStdError = 0;

CString sCmdLin = " UserID";
BOOL bRet = CreateProcess( m_sProductPath+"\\B.exe",
sCmdLin,
NULL,
NULL,
FALSE,
0,
NULL,
NULL,
&SI,
&PI);

After changing sCmdLin parameter to sCmdLin = "UserID" OR sCmdLin = " /UserID". But still i m unable to get the command line parameter in process B.exe. Pls suggest.

Thanks

SNI

Re: How to pass command line parameters using CreateProcess function.

CPallini28-Nov-08 2:39

CPallini

28-Nov-08 2:39

Possibly you've to pass "B.exe UserID" as second parameter.
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]

Re: How to pass command line parameters using CreateProcess function.

Mark Salsbery28-Nov-08 11:52

Mark Salsbery

28-Nov-08 11:52

First, note that the CreateProcess() lpCommandLine parameter is an inout
parameter in the Unicode version, so whatever you pass a pointer to technically
needs to be writable (up to 32,768 characters). If that's not feasible, you should
instead append the commandline to the lpApplicationName parameter string and pass NULL
as the lpCommandLine parameter.

Second, if you're not getting the passed commandline parameter(s) in the spawned app,
try starting the commandline parameter string with whitespace.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to pass command line parameters using CreateProcess function.

SNI5-Dec-08 1:49

SNI

5-Dec-08 1:49

Thanks it worked

SNI

[Message Deleted]

Member 462021628-Nov-08 1:59

Member 4620216

28-Nov-08 1:59

[Message Deleted]

Re: Communication with device

Roger Stoltz28-Nov-08 2:09

Roger Stoltz

28-Nov-08 2:09

Read this[^].

It is quite similar to what I always do when developing solutions for serial communication.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

I want to run Thread at regular interval using multimedia timer [modified]

anilaabc27-Nov-08 23:07

anilaabc

27-Nov-08 23:07

I want to do two to three tasks at the same time at regular interval ,time is important so i m using multimedia timer .
problem is ....timer run the thread only once .code is below
when I click button thread is created and multimedia timer is set.
count is an integer initialized with 0
void CTimerDlg::Onbtnstart()
{

Thread=AfxBeginThread(ThreadDisplay, this, THREAD_PRIORITY_TIME_CRITICAL,0 ,CREATE_SUSPENDED);
handle=Thread->m_hThread;
Thread->m_bAutoDelete=false;
timeSetEvent(100, 0, TimeProcVideo, (DWORD)this, TIME_PERIODIC);

}

//thread analyzing data
UINT ThreadDisplay(LPVOID lParam)
{
CTimerDlg *obj=(CTimerDlg*) lParam;
obj->abc();
return 1;
}

void CTimerDlg::abc()
{

count++;
char a[20];
GetDlgItem(IDC_STATIC)->SetWindowText("");
CString s=itoa(count,a,10);
GetDlgItem(IDC_STATIC)->SetWindowText(s);

SuspendThread(handle);

}
void CALLBACK TimeProcVideo(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2)
{
CTimerDlg* timer=(CTimerDlg*) dwUser;

timer->ControlThreads();

}
void CTimerDlg::ControlThreads()
{

ResumeThread(handle);
}

modified on Friday, November 28, 2008 11:18 PM

Re: I want to run Thread at regular interval using multimedia timer

Roger Stoltz28-Nov-08 2:06

Roger Stoltz

28-Nov-08 2:06

What on earth are you trying to do?

I mean that question very sincerely because you seem to have misunderstood the concept of multithreading completely.
If you experience the thread to run at least once, you must be calling ::ResumeThread() from some code that you have not provided in this post, which suggests that there may be more to it than the code you've posted.

What the code you provided does is create a thread suspended. When the thread resumes execution it will call the abc() function. In the same call chain ::SuspendThread() will be called and when ::ResumeThread() is called in order to let the thread resume execution, the thread will simply exit. That's why the "thread only runs once".

For the rest of us to be able to help you as constructive as possible, please answer this:
Why do you think you need multiple threads?

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

how can i dispaly icon or bitmap on status bar?

puppya27-Nov-08 21:36

puppya

27-Nov-08 21:36

i want to show some icons or bitmaps on status bar, how can i do this?
thanks in advance.

Re: how can i dispaly icon or bitmap on status bar?

_AnsHUMAN_ 27-Nov-08 21:38

_AnsHUMAN_

27-Nov-08 21:38

This[^]might help

Some things seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: how can i dispaly icon or bitmap on status bar?

Hamid_RT27-Nov-08 23:35

Hamid_RT

27-Nov-08 23:35

Putting a Progress Bar, BitMap, Animation or Dialog in a Multi Pane Status Bar (The Easy Way).[^]

How to enumerates media types on a given pin

zengkun10027-Nov-08 21:17

zengkun100

27-Nov-08 21:17

I want to enumerates ac3filter's preferred media types, I suppose this process should be very easy, but I can't get this work.
PLZ help!

int _tmain(int argc, _TCHAR* argv[])
{
	CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
	CLSID clsid;
        //ac3filter's clsid
	::CLSIDFromString(_T("{A753A1EC-973E-4718-AF8E-A3F554D45C44}"), &clsid);
	IBaseFilter* pFilter = NULL; 
	HRESULT hr = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER, 	__uuidof(IBaseFilter), (void **)&pFilter);
	IEnumPins* pEnumPins = NULL;
	hr = pFilter->EnumPins(&pEnumPins);
	if (SUCCEEDED(hr))
	{
		IPin* pPin = NULL;
		while (pEnumPins->Next(1, &pPin, NULL) == S_OK)
		{
			PIN_DIRECTION pinDir;
                        //the pin direction can be queried
			pPin->QueryDirection(&pinDir);
			IEnumMediaTypes* pEnumMediaTypes = NULL;
			HRESULT hr = pPin->EnumMediaTypes(&pEnumMediaTypes);
			if (SUCCEEDED(hr))
			{
				AM_MEDIA_TYPE* pMediaType = NULL;
                                //hr always S_FALSE, so the media type can not acquired
				hr = pEnumMediaTypes->Next(1, &pMediaType, NULL);
				pEnumMediaTypes->Release();
			}
			pPin->Release();
		}
		pEnumPins->Release();
	}
	return 0;
}

A Chinese VC++ programmer

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