C / C++ / MFC Discussion Boards

Re: error coming in class derived from CListVeiw

Rajkumar R21-Jun-07 22:33

21-Jun-07 22:33

I guess your the list control becomes the child of CFormView. Then if you want to adjust the size of list control, you have to handle the WM_SIZE, ... messages from CFormView and Adjust the list control size using SetWindowPos(). When you move the split bar the CFormView derived class will receive the Size messages.

Best Regards
Raj

How to OR Arrays Without loop

SandipG 21-Jun-07 18:40

SandipG

21-Jun-07 18:40

Is there a way through which i can OR entire contents of array.
or may be some memory function which will or two pointers with the specified size.

Re: How to OR Arrays Without loop

Cyrilix21-Jun-07 18:43

Cyrilix

21-Jun-07 18:43

And what exactly is wrong with using a loop for this purpose? I'm not exactly sure what you want to OR, but if you want to perform bitwise operations on the two numeric arrays, looping and storing the data in another array is a perfectly fine way of doing so.

Re: How to OR Arrays Without loop

SandipG 21-Jun-07 18:48

SandipG

21-Jun-07 18:48

Being arrays hugh loop takes 4-5 seconds.
so i want to reduce this time to 2-3 seconds.

Re: How to OR Arrays Without loop

Cyrilix21-Jun-07 20:05

Cyrilix

21-Jun-07 20:05

Well, what I don't understand is... looping is a concept, so it's not inherently slow unless your algorithm is crappy. If you have 100 pieces of data, and you want to process them all, you have to create a loop that goes through everyone of them. An array (to my inexperienced self), is quite a simple data structure, basically, an initial value and offsets of size sizeof(type), all contiguous in memory, which should be very fast to access. You only have to loop through all of this data once. You do not have to revisit them. Just something like:

int array_A[100];
int array_B[100];
int array_C[100];

for (int i = 0; i < 100; i++)
{
   array_C[i] = array_A[i] | array_B[i];
}

I don't know if it gets any simpler than that...correct me if I'm wrong.

Re: How to OR Arrays Without loop

SandipG 21-Jun-07 20:23

SandipG

21-Jun-07 20:23

I dont know whether i am looking for is possible or not?
what i want e.g if i have to assign 10000 elelemts in loop will take siginifancatly more time than a memcpy or memmove call. similarly something like memcpy or memmove is there anything that can speed up this or operation.

Re: How to OR Arrays Without loop

Mark Salsbery22-Jun-07 6:26

Mark Salsbery

22-Jun-07 6:26

How huge of a loop takes 4-5 seconds??? OMG | :OMG:

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: How to OR Arrays Without loop

Mark Salsbery22-Jun-07 6:34

Mark Salsbery

22-Jun-07 6:34

Borrowing from Cyrilix's code, here's code ORing two 50MB arrays of integers (200MB total bytes
each).

It takes much less than a second on my machine Smile | :)

int *array_A = new int[52428800];
int *array_B = new int[52428800];
int *array_C = new int[52428800];
for (int i = 0; i < 52428800; i++)
{
   array_C[i] = array_A[i] | array_B[i];
}
delete[] array_A;
delete[] array_B;
delete[] array_C;

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

copy a file bit -by- bit

Manmohan2921-Jun-07 17:15

Manmohan29

21-Jun-07 17:15

Can anyone help me to get answers to my these two questions :

1. How can I copy a file bit -by- bit? And also store that bit temporarily in any variable.
2. How to write a single bit in file? Is this method write.
fstream dfile;
char bit = '1';
dfile<<bit-48;

what does="" the="" above="" code="" writes="" to="" dfile="" a="" byte="" or="" bit.???

codes="" compiled="" in="" borland="" c++="" 3.0="" will="" be="" nice="" for="" me="" cos="" i'm="" using="" that="" as="" my="" compiler

--="" modified="" at="" 12:24="" thursday="" 21st="" june,="" 2007

manmohan="" bishnoi=""

<div="" class="ForumSig">Manmohan Bishnoi

Re: copy a file bit -by- bit

Mark Salsbery21-Jun-07 17:57

Mark Salsbery

21-Jun-07 17:57

The smallest I/O resolution you have is one byte so you'll have to work with 8 bits at a time.

You can use bitwise and shift operators to manipulate bits in a byte.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

How to use GDI+ function Bitmap( Class type, String resource )

Chen-XuNuo21-Jun-07 16:43

Chen-XuNuo

21-Jun-07 16:43

Recently I begin to program with GDI+,and I want to contruct a Bitmap object with the function Bitmap( Class type, String resource ),because my bitmap is in resource(is it right to use the function?).But I don't know how to set the parameters "type" and "resource"~ Help~ Confused | :confused:

Re: How to use GDI+ function Bitmap( Class type, String resource )

Sameerkumar Namdeo21-Jun-07 16:59

Sameerkumar Namdeo

21-Jun-07 16:59

Construct CBitmap object to first load the bitmap from resource.
Then use that object to get the handle of bitmap.
Finally ,from that handle you can construct a GDI+ Bitmap object by using
Bitmap::FromHandle() function.

Re: How to use GDI+ function Bitmap( Class type, String resource ) [modified]

Mark Salsbery21-Jun-07 17:56

Mark Salsbery

21-Jun-07 17:56

Or you can use this constructor:

Bitmap(HINSTANCE, const WCHAR *)

e.g.

Gdiplus::Bitmap bitmap(hInst, MAKEINTRESOURCEW(IDB_BITMAP));

Mark

-- modified at 0:02 Friday 22nd June, 2007
Fixed Typo

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Problem with Newline in Tooltips

Avril-Sun21-Jun-07 16:01

Avril-Sun

21-Jun-07 16:01

Hello,
I want to display tooltips in Wnd when the mouse is in some rect. So i use ON_NOTIFY(TTN_NEEDTEXTW, 0, OnToolTipNotify) and ON_NOTIFY(TTN_NEEDTEXTA, 0, OnToolTipNotify) Like,

void CLadderWnd::OnToolTipNotify(NMHDR *pNMHDR, LRESULT *pResult)<br />
{<br />
   TOOLTIPTEXTA* pTTTA = (TOOLTIPTEXTA*)pNMHDR;<br />
   TOOLTIPTEXTW* pTTTW = (TOOLTIPTEXTW*)pNMHDR;<br />
   ...<br />
   CString str = "abcd\n1234";<br />
   pTTTA->lpszText = (LPSTR)(LPCTSTR)str;<br />
}

I hope display text with multiline, but it will output just one line and display "abcd1234". I have tried "\r\n" or "\r" and they are the same.
How can I do it!
Thanks!

Re: Problem with Newline in Tooltips

Hamid_RT21-Jun-07 19:03

Hamid_RT

21-Jun-07 19:03

See A multiline extended tooltip control [^] does helpful?

WhiteSky

BIOS Access

Akin Ocal21-Jun-07 10:39

Akin Ocal

21-Jun-07 10:39

How can i modify BIOS-CMOS password ?
How can i change boot order embedded in BIOS ?

Thank you very much

Re: BIOS Access

zhang80060521-Jun-07 16:11

zhang800605

21-Jun-07 16:11

Sorry for my poor English .

Press del key after the check of hardware , and then you would come into BIOS setup interface .

Re: BIOS Access

Hamid_RT21-Jun-07 19:08

Hamid_RT

21-Jun-07 19:08

I think he want to do with c++.;)

WhiteSky

Re: BIOS Access

Akin Ocal21-Jun-07 19:20

Akin Ocal

21-Jun-07 19:20

I am asking how to program it from Windows user or kernel mode...

Re: BIOS Access

zhang80060521-Jun-07 20:32

zhang800605

21-Jun-07 20:32

Sorry for my poor English .

I find some info about BIOS develop . But I don't try it .

http://www.supfly.net/x00/2006-02/1753.htm[^] Chinese

http://www.codeproject.com/useritems/WMIQuery.asp[^] English

Re: BIOS Access

Hamid_RT21-Jun-07 20:49

Hamid_RT

21-Jun-07 20:49

Your answer is good but it has a problem we are on the c++ forum but your link is on the C# (WMIQuery). Smile | :)

WhiteSky

Re: BIOS Access

zhang80060521-Jun-07 22:38

zhang800605

21-Jun-07 22:38

Sorry.

source code

http://www.vckbase.com/code/findcode.asp[^] chinese

Re: BIOS Access

Hamid_RT22-Jun-07 1:48

Hamid_RT

22-Jun-07 1:48

Wow Mr/Mis zhang we have a new problem now I think some people cant see your link its china and also previous link was china,do you have any idea about new problem. Big Grin | :-D

WhiteSky

Checking to see if a file exists

SimplCodr21-Jun-07 9:54

SimplCodr

21-Jun-07 9:54

I would like to check for the existance of a file before I create it, since I dont want to recreate the file if it exists. The help in visual studio 2005 mentions EXIST operator but does not give a clue as to the syntax for using it. Can someone please enlighten me with the code to make this work?

Thanks alot,

Terry

Re: Checking to see if a file exists

David Crow21-Jun-07 10:11

David Crow

21-Jun-07 10:11

SimplCodr wrote:
I would like to check for the existance of a file...

Can you use _access()?

SimplCodr wrote:
...since I dont want to recreate the file if it exists.

Do you just want to append to it?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

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