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Divyang Mithaiwala wrote: But if u want to write something that exception is generate.
That's not necessarily true. For example, on x86 Windows the CPU, and therefore the OS, can only map memory around in 4K chunks. Another way of saying this is that on Windows (x86) the page size is 4K. This means that if you use a low level memory allocation function (like VirtualAlloc) the minimum allocation size is 4K. Getting around this limitation is one of the main functions of the heap (whether it's the Win32 heap accessed with functions like HeapAlloc or a custom heap layered over HeapAlloc or implemented in terms of VirualAlloc). When you attempt a small allocation from a heap (less then 4K on Windows) the heap gets a page of memory (if it hasn't already gone one handy) and hands you part of it. If another small allocation occurs it will hand out another piece of this same page (or some other partially used page) until the whole page is full and then it will get another page and start over. In short, just because you free some memory from a heap doesn’t mean the page that contains that address is freed as other allocations may reside in the same page: only when all allocations on a particular page are freed can the heap release the physical memory (and it may still not do so straight away). The OS can’t efficiently arrange for an exception to be generated when you access the unused part of a page as the underlying hardware only supports setting the memory protection attributes for a whole page. The real situation is even more complex than this brief description: for example the heap can recycle a heap block (and thus not free it) even when it contains no allocations as a form of caching and it need not change the protection on the page (so an exception is generated on access) as doing so means a context switch to Ring-0 and then another back to Ring-3.
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I'm a beginner.I'm working MFC and use Static Control to show texts.But the frame of Static is too small, the texts are so much to show in the frame .
Have everybody anyway to show all texts without change the frame size and Font size ? . I uesed Vertical Scroll Bar but I don't know how to do it.
Please Help me ! thanks
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if you want to show a text without change size and font i suggest use form editbox
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Yes...
As WhiteSky mentioned you can use edit box after disabling for this.
Here you can also find the vertical and horizontal scrol bars
Dream bigger... Do bigger...Expect smaller
aji
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The first , I tried with Edit Box , but I want to use Font, colour and Font size . Because i 'm a beginner so I don't known to change Font , colour and Font size in Edit box .
If you know how to , Please show to me ! thanks
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To change font
Here am giving a font of Arial 14 to edit box.
1) add member variable
CFont m_FontArial14;
2) Create font for the edit box in the constructor of the class
m_FontArial14.CreatePointFont( 140, "Arial" );
3) Then call SetFont in OnInitDialog()
GetDlgItem( IDC_EDIT )->SetFont( &m_FontArial14 );
( where IDC_EDIT is the ID of the edit control )
To change color
it is better to override OnCtlColor()
Dream bigger... Do bigger...Expect smaller
aji
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for change color see WM_CTLCOLOREDIT or WM_CTLCOLORfor change font you can use m_Edit.SetFont(GetFont())
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Thanhnamdo wrote: I uesed Vertical Scroll Bar but I don't know how to do it.
In static control????
I think u need to change font or frame size of static control to do it.
Dream bigger... Do bigger...Expect smaller
aji
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I found out that _argc is wrong to calculate the count of parameters.
Once there is redirection parameter that looks like '>error.txt'
using redirection symbol '>'
the _argc is wrong, why?
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Really? Could you give me advice?
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Hello everyone!
Can anyone help me here? I really don't see why this code doesn't work...
class Game<br />
{<br />
Graphics *gfx;<br />
<br />
int player_x, player_y, car1_x, car1_y;<br />
<br />
int gUpKey, gDnKey, gLtKey, gRtKey;<br />
<br />
bool inCar;<br />
<br />
public:<br />
Game(void);<br />
~Game(void);<br />
bool Respond();
void PlacePlayer(int x, int y);
int Init(Graphics *gfx);
};
I get the following errors:
c:\Incoming\War Game\Game.h(7): error C2143: syntax error : missing ';' before '*'<br />
c:\Incoming\War Game\Game.h(7): error C2501: 'Game::Graphics' : missing storage-class or type specifiers<br />
c:\Incoming\War Game\Game.h(7): error C2501: 'Game::gfx' : missing storage-class or type specifiers<br />
c:\Incoming\War Game\Game.h(24): error C2061: syntax error : identifier 'Graphics'<br />
Why is that? Thanks!
BTW: Line 7 is the 3rd one, and 24 is the one before the last one...
-- modified at 23:14 Monday 24th July, 2006
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Kixdemp wrote: and I'm starting to think it's the crappy VC++ 2003 I'm using...
Nope, its not. You have to have Graphics defined or atleast a forward reference before this statement otherwise this statement will fail on all cpp compilers (at least the ones I know of)...
Place this statement before class Game:
class Graphics;
John Last modified: Wednesday, July 26, 2006 4:55:14 PM --
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You might start off by telling it what "Graphics" is. It doesn't have a clue until you point it to the library and headers if that is refering to GDI+
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The Graphics class is central to GDI+ the same way CDC is to MFC graphics output so it was the natural choice for a guess.
Glad to hear you got with a forward declaration.
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Hey all,
How dO I decide waht is the timer identifier(the first parameter) number in SetTimer function?
It should be a nonzero number, but is there any condition that determines this number?
or can i give any number from 1 to anything?
Thanks,
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It can be anything you want. Typically, you would define or declare a constant symbol for it somewhere. This is your nIDEvent that you use during OnTimer events to figure out which timer is going off and when you KillTimer().
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Hi,
I need to be able to read & write to a PCI Digital Input/Output card, and i'm going to be using VC++ 6.0/MFC on a WinXP machine to accomplish this. If I am correct, I believe Windows will not allow direct communication to an I/O port...The manual that came with the card (no software drivers) had some programming examples in which 'outportb' & 'inportb' function calls were used to write and read data respectively...but unfortunately these functions are not recognized by vc++.
Could someone tell me if I am missing any library files that I need to include?
I apperciate the help....Thanks
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In any current version of windows (2K,XP,...) this is a statement that is not allowed by the operating system. There are two ways around this either write a device driver or use one of the open port device drivers that are available on the net. Sorry, I can not think of a link right now.
John
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As John Drescher suggested, use a "port access" library.
I have personally used inpOut32.dll http://www.logix4u.net/inpout32.htm[^] - works like a dream.
The only problem I remember is that the documentation was not clear regarding data size. I think that it does 8-bit inputs and outputs, so if you want to read a 16-bit value, you have to read from an odd port and from an even port, shift one byte by 8, and add, etc. And if you want to write a 16-bit value, you have to split it to two 8-bit outport32 calls.
For example, if you want to read a 16-bit status from port 0x302:
usStatusTemp1 = inp32(0x302);
usStatusTemp2 = inp32(0x303);
usStatusWord = usStatusTemp1 + (usStatusTemp2<<8);
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I have inherited some C++ code compiled under VS 2005. I would like to generate a list of the external dependencies now that the dev environment no longer lists them. Are there any tools/ addins that can do this? Thanks.
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