Re: Regarding memory - C / C++ / MFC Discussion Boards

Re: how to display a 24 bit bitmap on a SDI View

ashwath200510-Jul-06 20:42

ashwath2005

10-Jul-06 20:42

Can u give me the code.

Re: how to display a 24 bit bitmap on a SDI View

Hamid_RT10-Jul-06 20:54

Hamid_RT

10-Jul-06 20:54

with this code you can show your picture

<br />
CImage m_Image;<br />
m_Image.Load(Filename);<br />
m_Image.BitBlt(....);<br />

whitesky

Re: how to display a 24 bit bitmap on a SDI View

Code_Zombie10-Jul-06 20:46

Code_Zombie

10-Jul-06 20:46

Hi,

You can use Bitblt,

CBitmap* pOldBitmap =pDC->SelectObject(&m_hBit);
pDC->BitBlt(//...);
pDC->SelectObject(pOldBitmap);

Thanks

Re: how to display a 24 bit bitmap on a SDI View

ashwath200510-Jul-06 20:50

ashwath2005

10-Jul-06 20:50

What is m_hBit.

Re: how to display a 24 bit bitmap on a SDI View

Hamid_RT10-Jul-06 20:55

Hamid_RT

10-Jul-06 20:55

I think a handle bitmap

whitesky

Re: how to display a 24 bit bitmap on a SDI View

Parthi_Appu10-Jul-06 21:21

Parthi_Appu

10-Jul-06 21:21

'm_hBit' is an object to CBitmap Class. CDC::SelectObject() accepts pointer to CBitmap. You can have an CBItmap object in two steps,

CBitmap m_hBit;
m_hBit.LoadBitmap(...); //you can use other initializtion methods too

After these two steps, you can use m_hBit object in CDC::SelectObject()

Regarding memory

voorugonda prashanth10-Jul-06 19:20

voorugonda prashanth

10-Jul-06 19:20

hi all,

how much heap memory allocated for a process?

how much stack memory allocated for a process?

if i have 512MB RAM and trying allocate 1GB of Heap memory what will happen??

please explain or give me links.

Thanks in advance.

Re: Regarding memory

Code_Zombie10-Jul-06 19:39

Code_Zombie

10-Jul-06 19:39

Default heap size is 1mb,this can be changed using the /heap linker option.An application can directly use about 2gb
of address space.

Same for stack also,1mb is the default and can be changed using the /stack linker option

Re: Regarding memory

voorugonda prashanth10-Jul-06 20:01

voorugonda prashanth

10-Jul-06 20:01

but what will happen , if i have 512MB RAM and trying to allocate 1GB of heap memory?

please give me the links or suggest any books?

thank u.

Re: Regarding memory

Jonathan [Darka]10-Jul-06 23:16

Jonathan [Darka]

10-Jul-06 23:16

It will attempt to allocate the memory from virtual memory

Darka [Xanya]

Re: Regarding memory

Jun Du11-Jul-06 3:42

Jun Du

11-Jul-06 3:42

BTW, 2GB is for 32-bit Windows, which is the total limit of stack plus heap plus none-user memory.

Best,
Jun

_wrename ( ) somehow deletes the already existing file in the file system

cathy_d'souza10-Jul-06 19:20

cathy_d'souza

10-Jul-06 19:20

I m using _wrename( ) in my VC code.. when i register file in the file system and rename them using _wrename() after performing this many times, the new files are registered correctly and renamed appropriately but somehow the files registered earlier gets deleted from the file system. now each time the new file is registered an d renamed an old file is deleted.. I m unable to track the reason behind this..
Please help me with an appropriate logic behind this..

Thanks in advance..

Re: _wrename ( ) somehow deletes the already existing file in the file system

Parthi_Appu10-Jul-06 21:31

Parthi_Appu

10-Jul-06 21:31

what u r mentioning as old and new file. say their is a file '1.txt' and '2.txt',now rename '1.txt' to 'a.txt', whtz happening? is '2.txt' get deleted now?

Re: _wrename ( ) somehow deletes the already existing file in the file system

cathy_d'souza10-Jul-06 21:35

cathy_d'souza

10-Jul-06 21:35

Parthi_appu wrote:
what u r mentioning as old and new file. say their is a file '1.txt' and '2.txt',now rename '1.txt' to 'a.txt', whtz happening? is '2.txt' get deleted now?

Yes after registering and renamingmany files say 1.pdf,2.pdf,.....200.pdf, now when 201.pdf is registered and renamed some previous file like 10.pdf gets deleted and on subsequent renaming of more files, 11.pdf, 12.pdf and so on gets deleted.

Doubt regarding the Hook

Member 303984310-Jul-06 18:31

Member 3039843

10-Jul-06 18:31

Hi all,
Can any one plz tell me how to set the hook in MFC.
Thanks in advance.

Re: Doubt regarding the Hook

FarPointer10-Jul-06 18:36

FarPointer

10-Jul-06 18:36

Seting the hook using :-
SetWindowsHook
removing the hook:-
UnhookWindowsHook
MSDN and codeproject are having nice article on hooking.

Regards,
FarPointer
Blog:FARPOINTER

Re: Doubt regarding the Hook

Abhi Lahare10-Jul-06 18:37

Abhi Lahare

10-Jul-06 18:37

SetWindowsHookEx().

go thru article on Keyboard Hooking, its a good start

http://www.codeproject.com/dll/keyboardhook.asp[^]

Regards
Abhishake

Re: Doubt regarding the Hook

Code_Zombie10-Jul-06 19:19

Code_Zombie

10-Jul-06 19:19

Hi,

Please go thru the this link for more information on hooks http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks.asp[^]

Re: Doubt regarding the Hook

Hamid_RT10-Jul-06 20:27

Hamid_RT

10-Jul-06 20:27

See API Hooking Revealed[^]

whitesky

example

thathvamsi10-Jul-06 18:02

thathvamsi

10-Jul-06 18:02

can anyone send some simple examples showing the WM_TIMER implementation?

Re: example

Steve Echols10-Jul-06 18:19

Steve Echols

10-Jul-06 18:19

How about:

http://www.codeproject.com/system/timers_intro.asp[^]

- S
50 cups of coffee and you know it's on!

Re: example

ThatsAlok10-Jul-06 19:09

ThatsAlok

10-Jul-06 19:09

thathvamsi wrote:
n anyone send some simple examples showing the WM_TIMER implementation?

http://www.codeproject.com/audio/mult_media_timer.asp[^] for Multimedia Timer
http://www.codeproject.com/cpp/one_shot.asp[^] for MFC Timer 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
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: example

Code_Zombie10-Jul-06 19:58

Code_Zombie

10-Jul-06 19:58

Hi,

Try the below sample,

void CMainFrame::OnStartTimer() <br />
{<br />
   m_nTimer = SetTimer(1, 2000, 0);<br />
}<br />
<br />
void CMainFrame::OnStopTimer() <br />
{<br />
   KillTimer(m_nTimer);   <br />
}<br />
<br />
void CMainFrame::OnTimer(UINT nIDEvent) <br />
{<br />
  AfxMessageBox("Timer");	<br />
  CFrameWnd::OnTimer(nIDEvent);<br />
}

Re: example

Hamid_RT10-Jul-06 20:19

Hamid_RT

10-Jul-06 20:19

See example in msdn Here[^]

whitesky

Re: example

thathvamsi10-Jul-06 20:31

thathvamsi

10-Jul-06 20:31

Thanks for that.
For my application, can I use the following
Is this correct way of doing?

On_send(wparam,lparam)
{
//packet sent to serial device
//timer has to be triggered on here
SetTimer();

}

On_rx(wparam,lparam)
{
//checks for packet received
//if no packet received from serial device, then
{
//check for timer has elapsed
OnTimer()
{
//resend the packet to MPU
post_message(WM_RESEND,null)
}

}
}

On_resend(wparam,lparam)
{
//send same packet to PC
here, I have to restart the timer again to see if the
serial device responded within particular time as in On_rx.
KillTimer();
SetTimer();
}

What more do I need to add?

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