C / C++ / MFC Discussion Boards

Re: Junk characters appearing after writing buffer to file

kool_harsh27-Jul-09 20:00

27-Jul-09 20:00

ya David ur absolutely right that i should not depend completely on the code,but as you had asked that is there is any special provision made in this code to handle Resident files which are stored in $MFT FRS.Yes there is but still same problem is coming.Out of 100 only 2 or 3 files are being getting corrupted.Actually i dont know how to read MFT table through data runs (by using VCN's & LCN's) thats why i m using that code .If u have any idea about reading MFT table please let me know ...........

How to pass an array of objects from C# WebService to a VC++ COM object

sara_venusir24-Jul-09 22:21

sara_venusir

24-Jul-09 22:21

I write a COM class in VC++ that is used in a .Net WebService as a refrence.

The COM object has an interface that simulates an IDispatch array to pass arrays of different objects to/from COM object.

I can pass that array to COM object in C# samples correctly, but when i pass it in C# webservice i get exception.

Can enyone help me?
Is there any limitation for WebServices in using COM objects

How can get occupied by CPU and Memory usage by my application?

Le@rner24-Jul-09 21:27

Le@rner

24-Jul-09 21:27

Hi all,

please tell me how can i get details of CPU and Memory usage that is used by my application.

please help me for ths.

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: How can get occupied by CPU and Memory usage by my application?

Rajesh R Subramanian25-Jul-09 1:11

Rajesh R Subramanian

25-Jul-09 1:11

"_$h@nky_" wrote:
how can i get details of CPU and Memory usage that is used by my application.

See GetProcessTimes()[^]

What memory usage? The working set? If yes, then see GetProcessWorkingSetSize()[^].

It is a crappy thing, but it's life -^ Carlo Pallini

Re: How can get occupied by CPU and Memory usage by my application?

Le@rner25-Jul-09 1:54

Le@rner

25-Jul-09 1:54

I have a SDI type application in MFC.

I want to get information same like Window Task Manager display.

like My exe name is Test.exe

so in Processes Tab of Window Task Manager display the information like this.

Image Name="Test.exe"
User Name="";
CPU="07";
Memory="4,564K";
Description="Test";

Please help me for this.

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: How can get occupied by CPU and Memory usage by my application?

Rajesh R Subramanian25-Jul-09 2:17

Rajesh R Subramanian

25-Jul-09 2:17

"_$h@nky_" wrote:
Image Name="Test.exe"

See GetProcessName()[^]

"_$h@nky_" wrote:
User Name="";

See GetUserName()[^]

"_$h@nky_" wrote:
CPU="07";
Memory="4,564K";
Description="Test";

See Getting hardware information[^]

It is a crappy thing, but it's life -^ Carlo Pallini

Re: How can get occupied by CPU and Memory usage by my application?

Le@rner26-Jul-09 18:49

Le@rner

26-Jul-09 18:49

Rajesh R Subramanian wrote:
"_$h@nky_" wrote:
CPU="07";
Memory="4,564K";
Description="Test";

See Getting hardware information[^]

I m using this but i dont have information like i mention above.

please help me for this.

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

read(fd,buf,1)

ffrankcp24-Jul-09 20:56

ffrankcp

24-Jul-09 20:56

read(fd,buf,1) is so common that I do not need to explain its arguments.

Where can I find the source code for it?

Re: read(fd,buf,1)

killabyte24-Jul-09 21:20

killabyte

24-Jul-09 21:20

read is a really common function you are correct so common we cant really determine what platform your on?!?!

i am guessing linux from unistd.h ??? if this is the case then you should have it on the machine already, in one of those ddep dark corners of the system.

Re: read(fd,buf,1)

ffrankcp24-Jul-09 21:38

ffrankcp

24-Jul-09 21:38

Yes, Linux, C applications. I'm not looking for the header, I'm looking for the source code of the function.

Thanks.

-- frank

Re: read(fd,buf,1) [modified]

killabyte24-Jul-09 21:46

killabyte

24-Jul-09 21:46

im saying that the .c file is on your PC...

i think that read just passes params down to syscall() if that helps

modified on Saturday, July 25, 2009 4:11 AM

Re: read(fd,buf,1)

killabyte24-Jul-09 22:17

killabyte

24-Jul-09 22:17

342 asmlinkage ssize_t sys_read(unsigned int fd, char __user * buf, size_t count)
343 {
344 struct file *file;
345 ssize_t ret = -EBADF;
346 int fput_needed;
347
348 file = fget_light(fd, &fput_needed);
349 if (file) {
350 loff_t pos = file_pos_read(file);
351 ret = vfs_read(file, buf, count, &pos);
352 file_pos_write(file, pos);
353 fput_light(file, fput_needed);
354 }
355
356 return ret;
357 }
358 EXPORT_SYMBOL_GPL(sys_read);

found this snippet on interwebbs also http://www.gelato.unsw.edu.au/lxr/source/fs/read_write.c[^]

FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Still learning how to code24-Jul-09 20:50

Still learning how to code

24-Jul-09 20:50

My MFC application needs to monitor a directory on a network disk (mapped as Z Smile | :)

, and I'm using FindFirstChangeNotification() to do this. However, I am getting an INVALID_HANDLE_VALUE returned, and GetLastError() return 56 (which appears to be "The network BIOS command limit has been reached."
If I change the path of the monitored folder to a local drive, it works fine. How do I get over this problem ? (MSVC 6.0 - Win2000) (All the results from a Google search only seem to refer to a server situation)

Doug

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

killabyte24-Jul-09 21:54

killabyte

24-Jul-09 21:54

can you post a code snippet or something to work with?

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Still learning how to code24-Jul-09 22:05

Still learning how to code

24-Jul-09 22:05

Here is the code in my worker thread, as requested:-

UINT WaitNewScheduleThread(LPVOID Param)          //20090723
{
     CWinThread* pThread = AfxGetThread();
     int iID = pThread->m_nThreadID;
     CString szLogMsg;
     szLogMsg.Format("\n>>> Worker thread ID = 0x%X\n",iID);
     OutputDebugString(szLogMsg);

     CMCManagerBEDlg* pDlg = (CMCManagerBEDlg*)Param;
     CMCManagerBEApp* pApp;
     pApp = (CMCManagerBEApp*)AfxGetApp();

     HANDLE hCN;
     CString szPathName;
     szPathName.Format("Z:\\WinDVR");
     //szPathName.Format("C:\\Dell");

     // Set up array of two handles
     HANDLE hExitEvent;
     hExitEvent = pApp->m_hExitEvent;
     HANDLE handles[2];
     int iRetCode;

     DWORD dwRC;
            DWORD         err;

     do
     {
          hCN = FindFirstChangeNotification(szPathName,FALSE,FILE_NOTIFY_CHANGE_FILE_NAME);
          if(hCN == INVALID_HANDLE_VALUE)
               err = GetLastError();

          handles[0] = hCN;
          handles[1] = pApp->m_hExitEvent;

          dwRC = WaitForMultipleObjects(2,handles,FALSE,INFINITE);

          if(dwRC == WAIT_OBJECT_0)
          {
               szLogMsg.Format("Found new file on %s",szPathName);
               g_pLogFile->Add(szLogMsg);
               OutputDebugString(szLogMsg);

               if(g_pDlg->m_bPermitSchedUpdate)
                    g_pDlg->ProcessNewSchedule();
               else
                    g_pDlg->m_bNewSchedAvailable = TRUE;

               iRetCode = 0;
          }
          if(dwRC == WAIT_OBJECT_0 + 1)
          {
               szLogMsg.Format(">>> New recording schedule thread terminated\n");
               OutputDebugString(szLogMsg);
               g_pLogFile->Add(szLogMsg);

               iRetCode = 9;
               break;
          }
          if(dwRC == WAIT_FAILED)
          {
               szLogMsg.Format(">>> Wait failed");
               OutputDebugString(szLogMsg);

          }
     }
     while(TRUE);

     return iRetCode;
}

Doug

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

killabyte24-Jul-09 22:22

killabyte

24-Jul-09 22:22

so i think because your polling the call FindFirstChangeNotification() in an infinite loop it cries

might try adding a lil timer to the thread and put the contents of the do{}while(1) in the thread OnTimer event setting the polling interval to be something sensible

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Still learning how to code24-Jul-09 22:32

Still learning how to code

24-Jul-09 22:32

But the loop gets suspended at WaitOnMultipleObjects() after the very FIRST invocation of FindFirstChangeNotification(). (The whole reason for using this approach is to get away from a polling mechanism which introduces a delay) As I said originally, the code works fine when the target is a local disk - something to do with network, and I don't know how to fix it !!)

Doug

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

killabyte24-Jul-09 22:45

killabyte

24-Jul-09 22:45

i am thinking that WaitOnMultipleObjects()doesnt "wait" that long (assumption about to make an ass of me) try printing out a gettickcount() or something in the do loop and see if that is the case.

[edit]
and yes assupmtion has made an ass of me once again

http://support.microsoft.com/kb/810886[^]

[edit]

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Still learning how to code24-Jul-09 22:55

Still learning how to code

24-Jul-09 22:55

Hi Killabyte, Actually, I'm getting the problem single-stepping in the debugger, so the loop isn't executing as such. Also the WaitOnMultipleObjects() has an INFINITE timeout. I don't quite know how FindFirstChangeNotification() is implemented, but presumably the problem resides in the firmware of the network disk controller - have logged on to it, but can't see any parameters in the SMB server that I can tweak. Or am I missing something here ?

Doug

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

killabyte24-Jul-09 22:58

killabyte

24-Jul-09 22:58

see my edit above =) think that is your issue... i was barking up the wrong tree

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Still learning how to code24-Jul-09 23:08

Still learning how to code

24-Jul-09 23:08

Hi again, I had seen <a href="http://support.microsoft.com/kb/810886[^]">http://support.microsoft.com/kb/810886[^]</a>[<a href="http://support.microsoft.com/kb/810886[^]" target="_blank" title="New Window">^</a>] already - it only seems (unless I have missed something) to address the situation where the FindFirstChangeNotification() is aimed at a SERVER and then you can edit it's registry accordingly. In this case, the target is a network disk and that is why I logged on to it to see what parameters were available for tweaking - basically none !) I'd be surprised if I'm the first person to hit such a problem !

P.S. I clearly don't know how to insert a link (copied from a previous posting) in a new posting !!

Doug

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

killabyte24-Jul-09 23:24

killabyte

24-Jul-09 23:24

oh crap. so your saying that there is no registry edit applicable on your target network disk?

i would have thought that if there is no "server" so to speak of then the client side registry would be altered? but then again who said logic plays a part in software development haha

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Still learning how to code24-Jul-09 23:40

Still learning how to code

24-Jul-09 23:40

Hi Killabyte, Yes !! When you logon to 192.168.1.9 using a browser, the facilities provided are minimal. Don't forget that the whole thing is implemented in firmware !! Basically, I'm beginning to think that I'm at it's mercy, and I'm stuffed !!! (Will have to stick with my old polling mechanism after all ... unless someone knows different ...... !

Doug

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Frank Seidler24-Jul-09 23:06

Frank Seidler

24-Jul-09 23:06

Hi,

a quick look at the code shows that the handle will not be closed.

From MSDN:
When the handle is no longer needed, it can be closed by using the FindCloseChangeNotification function.

So I guess the error will show up after the loop has been executed a few times?

Regards

Frank

Re: FindFirstChangeNotification() results in "The network BIOS command limit has been reached."

Still learning how to code24-Jul-09 23:10

Still learning how to code

24-Jul-09 23:10

Hi Frank, Getting the problem whilst single-stepping in the debugger !

Doug

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