C / C++ / MFC Discussion Boards

Re: Best way to measure time interval of external events

CPallini25-Mar-09 7:52

25-Mar-09 7:52

Joe Woodbury wrote:
I've never needed this degree of precision in XP, but if I did, I'd be inclined to use a micro-controller

The same I would do.

Thank you for enlightening.
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: Best way to measure time interval of external events

Jonathan Davies25-Mar-09 7:06

Jonathan Davies

25-Mar-09 7:06

Get an IO card which provides events or callbacks via a library when a given input changes state. One I used called NextMove (overkill for your needs) had the first 3 or 4 inputs using interrupts. Try Amplicon (I think) or similar for an IO card.

MAC adresss code error

optical12325-Mar-09 3:42

optical123

25-Mar-09 3:42

Dear All

// Fetches the MAC address and prints it
static void GetMACaddress(void)
{
IP_ADAPTER_INFO AdapterInfo[16]; // Allocate information
// for up to 16 NICs
DWORD dwBufLen = sizeof(AdapterInfo); // Save memory size of buffer

DWORD dwStatus = GetAdaptersInfo( // Call GetAdapterInfo
AdapterInfo, // [out] buffer to receive data
&dwBufLen); // [in] size of receive data buffer
assert(dwStatus == ERROR_SUCCESS); // Verify return value is
// valid, no buffer overflow

PIP_ADAPTER_INFO pAdapterInfo = AdapterInfo; // Contains pointer to
// current adapter info
do {
PrintMACaddress(pAdapterInfo->Address); // Print MAC address
pAdapterInfo = pAdapterInfo->Next; // Progress through
// linked list
}
while(pAdapterInfo); // Terminate if last adapter
}

can anybody just walk through my code and here i am staticaly allocting the memory for the storing the adpater information for upto 16 NIC card...
but if i want to get and enumerate all the MAC addresses on my PC...
the above code will give upto 16 card so what to do next...

plz help me....

Regards
sunny

Re: MAC adresss code error

Electron Shepherd25-Mar-09 4:40

Electron Shepherd

25-Mar-09 4:40

I think you've misunderstood how the function works. It doesn't populate an array, but a linked list. See http://msdn.microsoft.com/en-us/library/aa365917(VS.85).aspx[^].

Server and Network Monitoring

Re: MAC adresss code error

optical12325-Mar-09 5:05

optical123

25-Mar-09 5:05

Hey

ya it will generate link list...but my problem is how to allocate memory if more than 16 cards in the system.......

Regards
Sunny

Re: MAC adresss code error

Electron Shepherd25-Mar-09 7:06

Electron Shepherd

25-Mar-09 7:06

Don't hard code the 16. From the link I gave you:

pOutBufLen [in, out]
A pointer to a ULONG variable that specifies the size of the buffer pointed to by the pAdapterInfo parameter. If this size is insufficient to hold the adapter information, GetAdaptersInfo fills in this variable with the required size, and returns an error code of ERROR_BUFFER_OVERFLOW.

Take a look at the sample code in the link and see how they do it.

Server and Network Monitoring

How to Display Radio button dynamically on Dialog.

hemlat25-Mar-09 3:39

hemlat

25-Mar-09 3:39

Hi,
I have written following code in my MFC code to display Radio Button on my dialog.

CButton myButton;
myButton.Create(_T("My button"), WS_CHILD|WS_VISIBLE|BS_RADIOBUTTON, 
   CRect(50,40,80,70),this, 1);

But Dialog is not showing Radio button.Can anyone help me.

Re: How to Display Radio button dynamically on Dialog.

led mike25-Mar-09 4:37

led mike

25-Mar-09 4:37

There are a number of things that could be the reason. Definitively know from your post we cannot.

My advice is that you learn how rendering is done in Windows OS which will enable you to determine your specific problem.

Re: How to Display Radio button dynamically on Dialog.

Electron Shepherd25-Mar-09 4:45

Electron Shepherd

25-Mar-09 4:45

What function is this code in? My guess would be that myButton is going out of scope and being destroyed just after it's been created.

Server and Network Monitoring

Re: How to Display Radio button dynamically on Dialog. [modified]

hemlat25-Mar-09 18:08

hemlat

25-Mar-09 18:08

Thanks for your reply.Previously myButton is local variable in OnInitDialog function. I have changed it to member variable and I have allocated memory.It is working fine and it is displaying Radio Button.

I have changed this to Push Button. I need to add Event Handler to this Button.Can any one help me.

modified on Thursday, March 26, 2009 12:17 AM

Re: How to Display Radio button dynamically on Dialog.

mutpan4-Feb-10 5:46

mutpan

4-Feb-10 5:46

you need to derive the new class from CButton and add the event handler in that class

I/O operation sytem error

LCI25-Mar-09 3:33

LCI

25-Mar-09 3:33

I am in a loop, reading from an RS232 port. There are times when i receive an exception with a system message that says:
"The I/O operation has been aborted because of either a thread exit or an application request"

// read a byte from port
while (!m_bExit)
{

// reset flag variables
dwBytesRead = 0;

// read
bRC = ReadFile(m_hCommPort, pDataBuff, 20, &dwBytesRead, NULL);
dwError = GetLastError();

if (!bRC)
{
if (ERROR_HANDLE_EOF != dwError || ERROR_TIMEOUT != dwError)
{
LPVOID SysMsg;

// reterieve system message
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
dwError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&SysMsg,
0,
NULL );

// show system message
ZeroMemory( m_szBuffer, sizeof(m_szBuffer) );
wsprintf(m_szBuffer, TEXT("ReadRS232Data() over %s: ReadFile(), %s"), m_Port, (LPCTSTR)SysMsg);

LocalFree(SysMsg);
return 0;
}
}

Has anyone ever found a solution to this or know what would cause this error? Cause once this happens you cannot read from the port until it is out of this conditions which seems to just happen on its own.

Thanks in advance for any help or direction.

Re: I/O operation sytem error

led mike25-Mar-09 4:33

led mike

25-Mar-09 4:33

LCI wrote:
I am in a loop

That sounds uncomfortable.

LCI wrote:
or know what would cause this error

What is the number returned from GetLastError?

Re: I/O operation sytem error

Cedric Moonen25-Mar-09 4:40

Cedric Moonen

25-Mar-09 4:40

led mike wrote:
That sounds uncomfortable.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: I/O operation sytem error

LCI25-Mar-09 5:37

LCI

25-Mar-09 5:37

I do not log the number that returns, but the related message is :

"The I/O operation has been aborted either because of a thread exit or an application request."

BTW, i cannot reproduce. I just know when it happens.

Catch(exception)

NewVC++25-Mar-09 2:39

NewVC++

25-Mar-09 2:39

Hi All

How can i Use AfxmessBox through Catch(exception)?Plz help me

i have code like this

try{
//Something here
}
catch(exception er)
{
AfxmessBox(er)
}

Plz help me

Re: Catch(exception)

Cedric Moonen25-Mar-09 2:41

Cedric Moonen

25-Mar-09 2:41

By calling exception::what() maybe ?

try
{
  //Something here
}
catch(exception er)
{
  AfxmessBox(er.what());
}

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Catch(exception)

Yusuf25-Mar-09 3:12

Yusuf

25-Mar-09 3:12

Cedric Moonen wrote:
try{ //Something here}catch(exception er){ AfxmessBox(er.what());}

plz hlp. i m getting err.

ERROR - 404 - Undefined Method 'AfxmessBox' - txtpsk detected!!!!!!

what is next, kidz coding in txtspk Roll eyes | :rolleyes:

Yusuf

Oh didn't you notice, analogous to square roots, they recently introduced rectangular, circular, and diamond roots to determine the size of the corresponding shapes when given the area. Luc Pattyn[^]

Re: Catch(exception)

ThatsAlok25-Mar-09 17:43

ThatsAlok

25-Mar-09 17:43

Cedric Moonen wrote:
AfxmessBox(er.what());

New Api i think Smile | :)

... I think this must be AfxMessageBox()

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Re: Catch(exception)

Cedric Moonen25-Mar-09 21:05

Cedric Moonen

25-Mar-09 21:05

Yeah, but I just copy/pasted his code Smile | :)

Programmers are lazy you know...

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

IE Toolbar development?

ritz123425-Mar-09 2:25

ritz1234

25-Mar-09 2:25

Hello Dear Friends,

How to develop the toolbar that resides on IE status bar.
For example if I've Google Toolbar installed in pc pressing Ctrl + F open up the search toolbar just above the IE status bar.
How can I achieve this.Any refrence materials or code would be appreciated.

ritz1234

Re: IE Toolbar development?

Mahesh Kulkarni25-Mar-09 2:57

Mahesh Kulkarni

25-Mar-09 2:57

this link ^ may help you

The secret of life is not enjoyment
but education through experience.
- Swami Vivekananda.

Re: IE Toolbar development?

ritz123425-Mar-09 3:14

ritz1234

25-Mar-09 3:14

Hi Mahesh,

Thanks for the reply I've already taken help from this link and I've also developed the IE toolbar. But the thing is I want to develop the Findbar which resides at the bottom of the IE like google Findbar.I want to know how can I do that?

Rose | [Rose]

ritz1234

Latency timer settings of communication port

AnayKulkarni25-Mar-09 2:01

AnayKulkarni

25-Mar-09 2:01

Hello to all,
In my project I am using a virtual com port means when I connect my device to USB port of a computer then computer creates a virtual serial port and when I disconnect that device then that port gets destroied.Now for my software I need "latency timer(msec)"(which we find in "Advanced" settings of a port) of this serial port to be "10", by default it is "16" there.So my question is can we change this "latency timer(msec)" of a port through programm at the time of opening the port? and if yes then how?

Means suppose e.g. I connected my device to the USB port of a computer and computer created a virtual port as "COM 5" then by default "latency timer(msec)" of this "COM 5" will be "16" and I want to change it to "10" then can I do it through programm itself at the time of opening "COM 5"? Its really urgent so please can anybody help me?

Thanks and Regards,

Anay

Re: Latency timer settings of communication port

Cedric Moonen25-Mar-09 2:16

Cedric Moonen

25-Mar-09 2:16

What is this "latency timer(msec)" exactly ? Is this something specific to your device ? How do you set it usually (you are talking about an "Advanced" settings but from where is that coming from ?).

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

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