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 What is operator new and new operator in C++?How are they different?How are they implemented in C++?
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sscottage wrote:
What is operator new and new operator in C++?How are they different?How are they implemented in c++
hello buddy,
i think there is no diffrence they oare same thing.
and about use,they are used for dynamically memory providing.
for eg look here
char *ch;
now if you want to allocate memory to it
use ch=new char[100];
and for freeing memory
delete []ch;
if you really want more message me bye and take care
-----------------------------
"I Think It will Work"
Formerly Known As "Alok The Programmer" at CP
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk
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"new operator" is used when refering to allocating new object.
i.e. char *bob = new bob [20];
"operator new" is part of the syntax used to specialize the "new operator".
They are both talking about the same thing for the most part.
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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LIBCD.lib(wincrt0.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function _WinMainCRTStartup
Debug/sim.exe : fatal error LNK1120: 1 unresolved externals
Can someone tell me what this linking error could mean? I have no clue what it means so any help would be appreciated. Thanks in advance.
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Hi friends,
I have a question about the custom controls in design mode.
I using VC 6 and when I create a custom control in a dialog, this appears with 0x50010000 default style. How I can know about each style that number represents?
Also for this number 0x50810000.
Thanks in advance!
Ivan Cachicatari
www.latindevelopers.com
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in winuser.h we can find info about it:
/*
* Window Styles
*/
#define WS_OVERLAPPED 0x00000000L
#define WS_POPUP 0x80000000L
#define WS_CHILD 0x40000000L
#define WS_MINIMIZE 0x20000000L
#define WS_VISIBLE 0x10000000L
#define WS_DISABLED 0x08000000L
#define WS_CLIPSIBLINGS 0x04000000L
#define WS_CLIPCHILDREN 0x02000000L
#define WS_MAXIMIZE 0x01000000L
#define WS_CAPTION 0x00C00000L /* WS_BORDER | WS_DLGFRAME */
#define WS_BORDER 0x00800000L
#define WS_DLGFRAME 0x00400000L
#define WS_VSCROLL 0x00200000L
#define WS_HSCROLL 0x00100000L
#define WS_SYSMENU 0x00080000L
#define WS_THICKFRAME 0x00040000L
#define WS_GROUP 0x00020000L
#define WS_TABSTOP 0x00010000L
#define WS_MINIMIZEBOX 0x00020000L
#define WS_MAXIMIZEBOX 0x00010000L
#define WS_TILED WS_OVERLAPPED
#define WS_ICONIC WS_MINIMIZE
#define WS_SIZEBOX WS_THICKFRAME
#define WS_TILEDWINDOW WS_OVERLAPPEDWINDOW
and 0x50010000 mean the bitmask that represent current style set:
for example:
0x50010000
0101 0000 0000 0001 0...
0100 0000 0000 0000 0... = 0x40000000L //WS_CHILD
0001 0000 0000 0000 0... = 0x10000000L //WS_VISIBLE
0000 0000 0000 0001 0... = 0x00010000L //0x00010000L
if u want u can create an parse function to enumarate styles from a bitmask...
i think from now u can read those style values by yourself.
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I want to ask you here how can I get the windows DDK to write windows drivers or if there is someone here who can help me with this. I'd rather not go to microsoft and get it becasue I do not have the time I want it very fast.
I need the libs and .h files so I can write drivers.
can someone help me with these please and can you also tell me please where can I find a tutorial in writting a simple driver because I am a beginner.
Please help me fast.
Thanks in advance.
gabby
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You really should get it from Microsoft; it includes a lot of sample drivers and help files. It sounds like you're new at device drivers, get ready for a steep learning curve!
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In addition to ordering the DDK CD, I also recommend buying a good book. I myself would advise for "Programming the Windows Driver Model, second edition", ISBN 0-7356-1803-8.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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i have two edit control: A (IDC_A) and B (IDC_B). If I chance A, B has to be automatically updated. How? Using OnChange()? Please send me a some example codes.
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Hi,
To do that, add OnChange function to edit A:
void CYourDialog::OnChangeIDC_A()
{
UpdateData();
m_sB = m_sA;
UpdateData(FALSE);
}
void CYourDialog::OnChangeIDC_A()
{
CString str;
CWnd *pCtrl = GetDlgItem(IDC_A);
if(pCtrl)
{
pCtrl->GetWindowText(str);
GetDlgItem(IDC_B)->SetWindowText(str);
}
}
Ivan Cachicatari
www.latindevelopers.com
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The program compiles, links and runs fine; no problem.
In editing the source, there is a particular function when I go to the Wizard Bar and click on the function name, I get a message stating, "Cannot find the definition for this function. ClassView cannot find function definitions until they are saved at least once."
Not only has the file been saved, and saved over and over again, but if the function was absented, the program wouldn't compile, link, (etc).
In effort to try and solve the situation, I've deleted BOTH the ".ncb" and ".plg" files, recompiled the program and got a clean compile and link, but still the Wizard Bar is saying it cannot find the function.
Does anyone know of a solution to this kind of behavior by the Wizard Bar?
Thanks for any insight.
William
Fortes in fide et opere!
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Hi,
I had a similar problem. I've deleted the .ncb, .opt and .plg files. And if it is necessary the .clw file (class wizard database), to restore reconstruct this later with Ctrl+W command.
If the problem persist with the Class Wizard, sometimes it does not recognize the functions that they contains parameters by default, for example:
void MyFunction(LPCTSTR param1 = NULL, CString param2 = _T("default value"), etc etc)
Ivan Cachicatari
www.latindevelopers.com
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I've gotten some code from MSDN on getting file names from dropped file(s). I've turned off the 'm_pMainWnd->DragAcceptFiles();' in my app's initinstance because I don't want the whole app to accept files, just a listbox. I've derived my own listbox class to handle the drop message, but I still have the same 'No-drop' symbol for a cursor when I drag a file over the listbox. I set 'Accept files' to true for the listbox's properties, but that doesn't work either. Can it be that hard to get the filename from a dropped file? I've also looked at some examples here on CP, but none of those seem to help either
[insert witty comment here]
bdiamond 
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Here is something that is going to kill me
I already inserted the columns (I can see them on the GUI).
I verified I get valid string in the "date" variable, but still :
The first column is filled with the name The second columns is EMPTY , why ?????????????????
<br />
m_ctl_files_list.InsertItem (i,name,2);
m_ctl_files_list.SetItemText (i,1,date);
<br />
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When you insert an item at location i when there are not already i items in the ocntrol, it gets inserted at the last position. What you will need to do is:
int index = m_ctl_files_list.InsertItem(i,name,2);
m_ctl_files_list.SetItemText(index, 1,date);
If you vote me down, my score will only get lower
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nope....
The same effect, nothing in column 1.
I even followed it with the debugger all the way to the:
code>
SendMessage(m_hWnd, LVM_SETITEMTEXT, nItem, (LPARAM)&lvi);<
within the CListCtrl and it looks like the message may be getting lost, I don't know why.....
Shay
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post the full source clip. column setup, the loop this is run in, etc.
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Already got it, thanks.
From some reason, executing InsertColumn (...) in the InitDialog is not setting up the columns right.
I executed it from the same function of the InsertText and then it worked,
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Did you take into account that columns are numbered starting with zero?
Steve
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of course....
As I said in my last reply, it worked after I copied and pasted the same exact code for InsertColumn from the InitDialog into the same function that does the SetItemText.
Why? I don't know....
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I have been researching and trying to figure out how to cut/copy/paste and I am just getting more confused. I am new to Visual C++ and have been doing tutorials. I have built a database application based on the tutorial from msdn http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vctutor98/HTML/_gs_creating_a_database_application.asp
here is a screenshot of my program. it is slightly different than the tutorial
http://www.public.iastate.edu/~cshoun/DrinkRecipes.jpg
my files are:
DrinkRecipes.cpp, DrinkRecipes.rc, DrinkRecipesDoc.cpp, DrinkRecipesSet.cpp, DrinkRecipesView.cpp, MainFrm.cpp, StdAfx.cpp
source files:
DrinkRecipes.h, DrinkRecipesDoc.h, DrinkRecipesSet.h, DrinkRecipesView.cpp, MainFrm.h, Resource.h, StdAfx.h
Any help would be great thank you
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