Re: Interrupts in Windows XP - C / C++ / MFC Discussion Boards

Re: Readfile() while Writefile()

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"

Re: Readfile() while Writefile()

Hamid_RT6-Mar-07 18:06

Hamid_RT

6-Mar-07 18:06

You can alo use of CFile::Read

WhiteSky

Re: Readfile() while Writefile()

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.

Re: Readfile() while Writefile()

Hamid_RT6-Mar-07 18:37

Hamid_RT

6-Mar-07 18:37

So maybe problem is of file did you check it?

WhiteSky

Re: Readfile() while Writefile()

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!

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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.

Re: Interrupts in Windows XP

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...?

Re: about SetTimer

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")

Re: about SetTimer

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()?

Re: about SetTimer

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[][^]

Re: about SetTimer

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

Re: about SetTimer

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")

how to get current Process's physical memory number?

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

Hamid_RT

6-Mar-07 18:12

See here[^] if helpfuls

WhiteSky

How to print color BITMAP from ressource on Printer ?

jerome_data6-Mar-07 13:39

jerome_data

6-Mar-07 13:39

I use MFC SDI in vs 2005.
I have a problem to print bitmap on my printer. It's works on OnFilePrintPreview() but not on the OnFilePrint()
I try with createcompatiblebitmap but i have a crash.

My code:

My printer is selected here, i have a pDC with m_hDC unused.
void MyView::OnPrint(CDC *pDC, CPrintInfo *pInfo)
{
CBitmap bmp;
if (bmp.LoadBitmap(IDB_BITMAP_1))
{
BITMAP bmpInfo;
bmp.GetBitmap(&bmpInfo);
CDC dcMemory;
BOOL result;
result=dcMemory.CreateCompatibleDC(pDC);
CBitmap* pOldBitmap = dcMemory.SelectObject(&bmp);
result=pDC->BitBlt(x, y, bmpInfo.bmWidth, bmpInfo.bmHeight, &dcMemory,
0, 0, SRCCOPY );
dcMemory.SelectObject(pOldBitmap);
}
}

thanks D'Oh! | :doh:

Re: How to print color BITMAP from ressource on Printer ?

Mark Salsbery6-Mar-07 14:54

Mark Salsbery

6-Mar-07 14:54

What do you mean by crash? Assertion error? BSOD?

Is pDC valid or NULL?

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

Re: How to print color BITMAP from ressource on Printer ?

jerome_data6-Mar-07 20:48

jerome_data

6-Mar-07 20:48

the pDC is valid because print text and line works correctly, i have only a assert error on:

...
dcMemory.CreateCompatibleDC(pDC);
bmp.CreateCompatibleBitmap(&dcMemory,bmpInfo.bmWidth,bmpInfo.bmHeight);
...

but the handle of pDC is unused

i have assert error here when i try CreateCompatibleBitmap(ASSERT on the dcMemory):

BOOL CGdiObject::Attach(HGDIOBJ hObject)
{
ASSERT(m_hObject == NULL);
...
}

Re: How to print color BITMAP from ressource on Printer ?

Hamid_RT7-Mar-07 0:22

Hamid_RT

7-Mar-07 0:22

I think your maybe your problem is of bmp.Load();(your answer to my reply)

WhiteSky

Re: How to print color BITMAP from ressource on Printer ?

Hamid_RT6-Mar-07 18:15

Hamid_RT

6-Mar-07 18:15

You said createcompatiblebitmap has a problem but where you used it? and whats error?

WhiteSky

Re: How to print color BITMAP from ressource on Printer ?

jerome_data6-Mar-07 20:39

jerome_data

6-Mar-07 20:39

the error come from ASSERT on the handle of the pDC in this function:

BOOL CGdiObject::Attach(HGDIOBJ hObject)
{
ASSERT(m_hObject == NULL);
...
}

i try CreateCompatibleBitmap :

void MyView::OnPrint(CDC *pDC, CPrintInfo *pInfo)
{
CBitmap bmp;
if (bmp.LoadBitmap(IDB_BITMAP_1))
{
BITMAP bmpInfo;
bmp.GetBitmap(&bmpInfo);
CDC dcMemory;
BOOL result;
result=dcMemory.CreateCompatibleDC(pDC);
CBitmap* pOldBitmap = dcMemory.SelectObject(&bmp);

bmp.CreateCompatibleBitmap(&dcMemory,bmpInfo.bmWidth,bmpInfo.bmHeight);

result=pDC->BitBlt(x, y, bmpInfo.bmWidth, bmpInfo.bmHeight, &dcMemory,
0, 0, SRCCOPY );
dcMemory.SelectObject(pOldBitmap);
}
}

Re: How to print color BITMAP from ressource on Printer ?

prasad_som6-Mar-07 22:25

prasad_som

6-Mar-07 22:25

jerome_data wrote:
bmp.CreateCompatibleBitmap(&dcMemory,bmpInfo.bmWidth,bmpInfo.bmHeight);

CreateCompatibleBitmap initializes a bitmap compatible to mentioned DC.
In your case, its already initialized. Thats why assert is there. Comment this line, as it is not required.

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

Re: How to print color BITMAP from ressource on Printer ?

Mark Salsbery7-Mar-07 3:48

Mark Salsbery

7-Mar-07 3:48

Good eye

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

Re: How to print color BITMAP from ressource on Printer ?

prasad_som7-Mar-07 23:01

prasad_som

7-Mar-07 23:01

Thanks !
But, seems like OP is not interested to reply back, once his problem is known.

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

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