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Do you realy need all this data in memory, all at the same time?
Things like arrays of data are nice to work with, but, if it becomes unreasonably large, (and I would call 400 MB too large to work with), you employ a different approach. You open the File, and read small sections from which you work out where to go next,and so on.
Why things do not work in your case is a different matter, and has most likely to do with where the OS puts things in the LOGICAL Address Space.
For Instance, the area from 2GB to 4GB in your logical address space is reserved by the system. You would not get memory allocated there even if you had 16 GB of memory.
Admittedly, Microsoft does not encourage this approach, their User MFC Document Model was until recently that a Document is something like a Word Document or a Spread Sheet which is Loaded, Modified and Saved each time in it's entirety. That is not a very useful model for large amounts of Data.(You cannot load say a 64 kb Block out of the middle of a CDocument).
Where amounts of Data became large, I devised my own DB Structure, and never read entire files, just the sections I Need. I also found it useful to create and store Hash Tables to speed up searching.
Hope this is Helpfull, 
Bram van Kampen
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thank you for your responses but the thing is that i am working with medical data from CT images (3D ray casting) and the data must be in memory so the rotation of the 3D object can be fast.
I can do more that one allocation (100 of 4 MB) but i would prefere only one of 400 or 600 or more even when I have 3 GB of RAM.
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Well, I've never dealt myself with a single object of say 400 MByte.
I do not think that the OS was designed to deal with that either, Furthermore, any software I have seen dealing with objects of this size tended to split them down. The OS can however deal with items aglomarating to this size and larger, provided they are not required to occupy a continuous logical address range. There is a difference between what you would prefer to get optimal performance, and what the OS for practical reasons allows you to do on the ground. In your case I would write it on the basis that it tries every time for the largest chunk of memory it can get, and deal with it that way.
What Also may be worth trying is to try and create a 400 MByte heap, as early as possible in the Program. (In InitInstance, Line One, before the MFC Stuff.) Realistically though, If you expect your code to run on every PC in the country, you have to prepare your code for data in fragments. If you expect it to run on only One PC, (your Own) you can fiddle and tweak the OS until it runs allways with a 400 MByte Object.
Regards
Bram van Kampen
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yes, maybe is the unique way to do it.
think you
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ybenaabud wrote: I can not understand wy i can´t allocate more than 400 continus Mega bytes with new[] or malloc.
Are you sure that 400MB of contigious RAM is available? For example, you may have 1GB free, but if it is segmented in five 200MB chunks, the new operator will indeed fail.
Have you tried an amount smaller than 400MB?
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Yes I think that the problem is memory fragmentation !! I can reach 1,9GB of allocated memory with differents new[] of 1MB each time.
does everybody knows how to turn maximum memory allocation from 2GB to 3GB on a 32 XP Pro PC for a process ?
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ybenaabud wrote: does everybody knows how to turn maximum memory allocation from 2GB to 3GB on a 32 XP Pro PC for a process ?
I doubt everybody does. Are you referring to the /#GB option?
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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yes /3GB in boot.ini. but when a do it in my windows xp pro pc with 3GB of physical ram I lose the network connexions !!
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ybenaabud wrote: but when a do it in my windows xp pro...
See here and here.
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Hi everybody,
I have been having problems with http post using visual c++ (not .Net)
Here is my code:
CInternetSession session("My Session");
CHttpConnection* pServer = NULL;
CHttpFile* pFile = NULL;
DWORD dwRet;
char szBuff[1024];
try
{
CString strServerName = "http://www.cnn.com";
INTERNET_PORT nPort = 80;
pServer = session.GetHttpConnection(strServerName, nPort);
pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_GET, "");
pFile->SendRequest();
pFile->QueryInfoStatusCode(dwRet);
if (dwRet == HTTP_STATUS_OK)
{
...
Well I have tried a lot of code combinations. And when I realized application crashes at
pFile->SendRequest(); I decided to make a GET instead of POST. Well it still does not work.
When I run the code above I got a MessageBox saying The URL is invalid 
And when I run with AddRequestHeaders(NULL) line it basicly crashes..
I have done a research at web but cannot find anything useful.
My main purpose is to open a URL which I can do it using session::openurl and after getting the content post a form and get feedback from post.
Thank you all
--- OK People the problem is solved. Guess what I SHALL NOT WRITE HTTP:// at the beginning of URL! I guess msdn should contain such an info! 
modified on Saturday, September 6, 2008 11:08 AM
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Hi all,
please tell me how can i repaint a view.
if possible please explain with example.
thanks in advance.
IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH
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In your view class, implement the virtual OnDraw() method. Put all your drawing code within this method either directly or indirectly by calling other functions to draw your views client area content.
// .h
virtual void OnDraw(CDC* pDC);
// .cpp
void CYourView::OnDraw(CDC* pDC)
{
/*
Draw your graphics primitives here. This includes anything
that is displayed within your client area. Whenever a portion
of your client area gets invalidated, this method will get
called to redraw the area affected.
*/
pDC->MoveTo(10,10);
pDC->LineTo(100,100);
}
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Also, If you want to explicitly force a redraw of your client area like when you change the text that will get output on the next draw, you can call CWnd::Invalidate() to invalidate the entire client area or CWnd::InvalidateRect() if only a portion needs to be redrawn.
Note that this only invalidates it. The OnDraw() method will not get called until the message loop processes the next draw request. Normally this is soon enough not to notice any delay. However, if you need it to force an immediate refresh, you can call CWnd::UpdateWindow() to redraw the invalidated rectangle or CWnd::RedrawWindow() whose actions depend on the flags passed in.
NOTE: CWnd::UpdateWindow and CWnd::RedrawWindow are not normally used unless you have special needs. Most drawing code should simply allow the message loop to call your OnDraw() when it can to prevent delays in processing other messages.
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When I am calling a thread from main dialog to get data from server and show it in the child dialog
i.e setting the values of the controls with the values from the server It is giving erroe when i update. Please tell what is the error My code is as follows:
void CVisitorDtlsDlg::FillDetails(VisitorDetails stVisitorDetails)
{
m_stVisitorDetails = stVisitorDetails;
m_strBrowser = stVisitorDetails.strBrowser;
m_strCity = stVisitorDetails.strCity;
m_strCountry = stVisitorDetails.strCountry;
m_strJava = stVisitorDetails.strJava;
m_strLanguage = stVisitorDetails.strLanguage;
m_strOS = stVisitorDetails.strOS;
m_strRefere = stVisitorDetails.strRefere;
m_strRegion = stVisitorDetails.strRegion;
m_strScreen = stVisitorDetails.strScreenColors;
m_strTime = stVisitorDetails.strUserTime;
m_strScreen = stVisitorDetails.strScreenColors;
m_strURL = stVisitorDetails.strURL;
m_strIPHost = stVisitorDetails.strIPHost;
m_strSysBrowser = stVisitorDetails.strSysBrowser;
m_strVisitorName= stVisitorDetails.strVisitorName;
m_strVisitorEmail= stVisitorDetails.strVisitorEmail; m_strCustomInformation=stVisitorDetails.strCustomInformation;
m_strCountryLanguage= stVisitorDetails.strCountryLanguage;
m_strCurrency= stVisitorDetails.strCurrency;
m_strPopulation= stVisitorDetails.strPopulation;
this->UpdateData(false);
m_staticURL.SetLinkText(m_strURL);
m_staticVisitorEmail.SetLinkMail(m_strVisitorEmail);
m_staticRefere.SetLinkMail(m_strRefere);
this->UpdateData(false);
CRect rect1;
m_staticURL.GetWindowRect(&rect1);
ScreenToClient(&rect1);
InvalidateRect(&rect1);
CRect rect2;
m_staticRefere.GetWindowRect(&rect2);
ScreenToClient(&rect2);
InvalidateRect(&rect2);
CRect rect3;
m_staticVisitorEmail.GetWindowRect(&rect3);
ScreenToClient(&rect3);
InvalidateRect(&rect3);
}
I am calling the above function in a thread from CMainDlg which is the Parent Dialog
Thanks in Advance
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MFC window objects (like your CDialog-derived class) can only be used from the original GUI thread that created them.
If you want a worker thread to update data in a dialog, the best method is to use a user-defined message and call PostMessage to tell the dialog to update itself.
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Can u tell me how to define a user method and how to call PostMessage()
I am new to VC++
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This[^] article should help.
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Still i am having error i have used the following code for posting message from worker thread
AfxGetMainWnd()->PostMessageW(WM_GET_DATA, 0, 0);
and the message handler used is
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Dhiraj kumar Saini wrote: Still i am having error...
What error? We're not mind readers. This is akin to taking your car to the local mechanic, dropping it at his door and saying, "Fix this." 
See here.
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Dude, when will you learn to use the "code block" tag ? 
For your question: UpdateData is considered UI stuff, so you can't call it from a thread. The easiest option that you have here is to have a VisitorDetails structure member of your dialog class that you will fill from within your thread. Once this is done, the thread will need to send a user defined message to the main window signaling that this is done. In the function that handle that message, set your class member as you did here and call UpdateData.
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while porting application code from VC++6 to VS2008 the call of CreateEx function is returning the false with the same parameters in VS2008 while with same parameter the call of CreateEx function is working fine in the VC++6.
The code flow is like this:
Called MFC's API CreateEx with the following prameter's
if ( !CreateEx( 0, AFX_WNDMDIFRAME, NULL, dwCreateStyle, 0, 0, 0, 0, pParentWnd->m_hWnd,
( HMENU)uID, NULL ) )
{
return FALSE;
}
Earlier in VC++6.0 this API was internally using the function ::CreateWindowEx then this function was returning the proper handle of the splitter window.
But now in VS2008 this API internally calls the function ::AfxCtxCreateWindowEx instead of ::CreateWindowEx. and this new function is returning the handle as NULL.
This code works properly for the main window but in case of splitter window it is failing.
In the application i have used a dynamic splitter window which is fully customized and derived from CWnd class.
If i changed the second parameter as STATIC of CreateEx functionn then it works fine but resizing of splitter window is not working and application is crashing.
Below is the function from where CreateEx is called............
BOOL CSplitterWndX::CreateCommon( const CWnd* const pParentWnd, const SIZE sizeMin, const DWORD dwStyle, const UINT uID )
{
ASSERT( pParentWnd != NULL );
ASSERT( ( sizeMin.cx >= 0 ) && ( sizeMin.cy >= 0 ) );
ASSERT( ( dwStyle & WS_CHILD ) );
ASSERT( uID != 0 );
ASSERT( ( m_pColInfo == NULL ) && ( m_pRowInfo == NULL ) );
ASSERT( ( m_nMaxCols > 0 ) && ( m_nMaxRows > 0 ) );
DWORD dwCreateStyle = dwStyle & ~( WS_HSCROLL | WS_VSCROLL );
if ( afxData.bWin4 )
{
dwCreateStyle &= ~WS_BORDER;
}
VERIFY( AfxEndDeferRegisterClass( AFX_WNDMDIFRAME_REG ) );
if ( !CreateEx( 0, AFX_WNDMDIFRAME, NULL, dwCreateStyle, 0, 0, 0, 0, pParentWnd->m_hWnd, ( HMENU )uID, NULL ) )
{
return FALSE;
}
TRY
{
m_pColInfo = new CRowColInfo[m_nMaxCols];
for ( int nCol = 0 ; nCol < m_nMaxCols ; nCol++ )
{
m_pColInfo[nCol].nMinSize = sizeMin.cx;
m_pColInfo[nCol].nIdealSize = 0;
m_pColInfo[nCol].nCurSize = -1;
m_pColInfo[nCol].bFixedSize = FALSE;
m_pColInfo[nCol].bAlwaysVisible = FALSE;
}
m_pRowInfo = new CRowColInfo[m_nMaxRows];
for ( int nRow = 0 ; nRow < m_nMaxRows ; nRow++ )
{
m_pRowInfo[nRow].nMinSize = sizeMin.cy;
m_pRowInfo[nRow].nIdealSize = 0;
m_pRowInfo[nRow].nCurSize = -1;
m_pRowInfo[nRow].bFixedSize = FALSE;
m_pRowInfo[nRow].bAlwaysVisible = FALSE;
}
m_pOldColInfo = new CRowColInfo[m_nMaxCols];
for ( int nCol = 0 ; nCol < m_nMaxCols ; nCol++ ) // Windows Vista Support 0.1
{
m_pOldColInfo[nCol].nMinSize = sizeMin.cx;
m_pOldColInfo[nCol].nIdealSize = 0;
m_pOldColInfo[nCol].nCurSize = -1;
m_pOldColInfo[nCol].bFixedSize = FALSE;
m_pOldColInfo[nCol].bAlwaysVisible = FALSE;
}
m_pOldRowInfo = new CRowColInfo[m_nMaxRows];
for ( int nRow = 0 ; nRow < m_nMaxRows ; nRow++ ) // Windows Vista Support 0.1
{
m_pOldRowInfo[nRow].nMinSize = sizeMin.cy;
m_pOldRowInfo[nRow].nIdealSize = 0;
m_pOldRowInfo[nRow].nCurSize = -1;
m_pOldRowInfo[nRow].bFixedSize = FALSE;
m_pOldRowInfo[nRow].bAlwaysVisible = FALSE;
}
SetScrollStyle( dwStyle );
}
CATCH_ALL( pE )
{
DestroyWindow();
return FALSE;
}
END_CATCH_ALL
return TRUE;
}
waiting for early response.....
Sachindra
modified on Sunday, September 7, 2008 6:15 AM
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Hi all,
I'm still beginner in MFC  .
My question is how I can copy a file.
For example,
I want to copy from C:\pic.jpg to D:\pic.jpg using MFC.
Thanks all.
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Use CopyFile() or CopyFileEx(), dependent on whether you want notification of the copy progress through a callback function (the docs will explain it in more detail).
Regards,
--Perspx
"The Blue Screen of Death, also known as The Blue Screen of Doom, the "Blue Screen of Fun", "Phatul Exception: The WRECKening" and "Windows Vista", is a multi award-winning game first developed in 1995 by Microsoft" - Uncyclopedia
Introduction to Object-Oriented JavaScript
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