C / C++ / MFC

NiceNaidu6-Mar-07 17:43

NiceNaidu

6-Mar-07 17:43

Microsoft Visual C++ (also known as MSVC) is an Integrated development environment (IDE) product for the C, C++, and C++/CLI programming languages engineered by Microsoft. It has tools for developing and debugging C++ code, especially that written for the Microsoft Windows API, the DirectX API, and the Microsoft .NET Framework.

Appu..
"My blood group is not B+.But I have it my blood"

Hamid_RT6-Mar-07 18:04

6-Mar-07 18:04

See Visual C++[^]

WhiteSky

ThatsAlok6-Mar-07 21:56

ThatsAlok

6-Mar-07 21:56

WhiteSky wrote:
isual C++[^]

one of my Favorite site for GK Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
Global Interface Table: An Easy Way to Marshal an Interface Pointer[new]
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Hamid_RT7-Mar-07 0:19

Readfile() while Writefile()

7-Mar-07 0:19

Its interesting for me I can find every answers on the wikipedia.

WhiteSky

LiYS6-Mar-07 16:32

LiYS

6-Mar-07 16:32

Hi all:

I was trying to read in data from a file while it was written, but failed because the below hFile turn out to be invalid, Is it possible to reading while writing to the same file?

	HANDLE hFile = CreateFile( _T("c:\\dat.txt"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

Parthi_Appu6-Mar-07 17:37

Parthi_Appu

6-Mar-07 17:37

LiYS wrote:
HANDLE hFile = CreateFile( _T("c:\\dat.txt"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

The above code is to open a file for reading, but how the file was opened for writing?..

The access permission should allow shared reading, while opening the file for writing also..

Hope this will help...

Do your Duty and Don't expect the Result

NiceNaidu6-Mar-07 17:39

NiceNaidu

6-Mar-07 17:39

This article should help you.
http://msdn2.microsoft.com/en-us/library/aa363874.aspx[^]

Appu..
"My blood group is not B+.But I have it my blood"

Hamid_RT6-Mar-07 18:06

6-Mar-07 18:06

You can alo use of CFile::Read

WhiteSky

LiYS6-Mar-07 18:26

LiYS

6-Mar-07 18:26

WhiteSky wrote:
You can alo use of CFile::Read

Same thing happened to CFile::Read either.

Hamid_RT6-Mar-07 18:37

6-Mar-07 18:37

So maybe problem is of file did you check it?

WhiteSky

Re: Interrupts in Windows XP

ThatsAlok6-Mar-07 21:56

ThatsAlok

6-Mar-07 21:56

LiYS wrote:
sa

LiYS wrote:
You can alo use of CFile::Read

Use ShareDenyNone Flag!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
Global Interface Table: An Easy Way to Marshal an Interface Pointer[new]
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Interrupts in Windows XP

anantvemuri6-Mar-07 15:35

anantvemuri

6-Mar-07 15:35

Hello everyone,

Is there a way that a software interrupts be programmed in windows. I need to run a timer routine that sends an interrupt every 20 ms. I have tried using

Sleep(20) ---> Not deterministic
GetTickCount ---> Determinitic up to 100ms
QueryPerformanceCounter ---> Gives a good result.

But I am looking to see if there is some way that within windows scheduler or elsewhere itself a timer interrupt could be programmed.

Thank you,
Best regards,
Suraj.

Stephen Hewitt6-Mar-07 19:33

Stephen Hewitt

6-Mar-07 19:33

Interrupts are handled in kernel mode, not user mode. Windows in a preemptive multitasking OS not a real-time OS; if you need super accurate timing you could be in for problems.

Steve

Re: Interrupts in Windows XP

anantvemuri7-Mar-07 4:21

anantvemuri

7-Mar-07 4:21

Hello,

I don't need perfect accuracy. But was wondering on only that if there are interrupts that can be set within my program so that the 20 ms time can be detected. Or is there is way in which any inbuilt timer (in windows) can be set so that it counts down and sends a trigger to the windows scheduler.

Thanks.
Suraj.

about SetTimer

mfc_dialog6-Mar-07 15:30

mfc_dialog

6-Mar-07 15:30

SetTimer(hwnd, 100, 100, NULL);

...OnTimer(...)
{
AfxMessageBox("");
}

why it can popup some messgebox, it look like a Multi-Thread...?

Mark Salsbery6-Mar-07 15:35

Mark Salsbery

6-Mar-07 15:35

mfc_dialog wrote:
why it can popup some messgebox, it look like a Multi-Thread...?

What are you asking? Smile | :)

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

mfc_dialog6-Mar-07 15:57

mfc_dialog

6-Mar-07 15:57

INT g_nData;<br />
<br />
SetTimer(hwnd, 100, 100, NULL);<br />
<br />
...OnTimer(...)<br />
{<br />
   if (g_nData > 0)<br />
   {<br />
      g_nData--;<br />
   }<br />
   else<br />
   {<br />
      g_nData++;<br />
   }<br />
}

g_nData will not happen "Memory access errors"?unneed use ::EnterCriticalSection() and ::LeaveCriticalSection()?

prasad_som6-Mar-07 17:06

prasad_som

6-Mar-07 17:06

Again, cant understand your question. By the way, you have mentioned last parameter of SetTimer as NULL. That means, there will be no timerproc associated with this timer.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Parthi_Appu6-Mar-07 17:15

Parthi_Appu

6-Mar-07 17:15

mfc_dialog wrote:
SetTimer(hwnd, 100, 100, NULL)

You didn't provide any timer functon for the timer 100.
So it will call default OnTimer(nEventID)...

I think you are using some other Timers too..
do your calculations by checking the Event ID parameter...

Hope this will help...

Do your Duty and Don't expect the Result

how to get current Process's physical memory number?

Mark Salsbery7-Mar-07 3:43

Mark Salsbery

7-Mar-07 3:43

You may want to initialize g_nData:

INT g_nData = 0;

The timer messages should arrive on the same thread so you shouldn't need ::EnterCriticalSection()
and ::LeaveCriticalSection().

Are you getting errors at runtime?

Mark

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

sssa20006-Mar-07 15:11

sssa2000

6-Mar-07 15:11

i have used the GlobalMemoryStatus(), but is can not renturn a process's physical memory number.
can any one tell me?thanks!

Re: how to get current Process's physical memory number?

Hamid_RT6-Mar-07 18:12