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Hi Somenath,
now if we define an object of class C, and if we debug the application using MSVC debugger, then inside the object of C, the vtable will show the pointer to only fun().
=>Class C object will contain vptr pointing to virtual table for class C and as thee are 2 virtual functions and first declared function is fun(), vptr will contain address of this class C "fun()".
although in actual memory of the vtable the pointer to funB() will be there, it is not displayed in the debugger's vftable entry. i am curious to know why it is like this.
=>yes as object C will contain only one ptr.
class B: public A
{
void fun(); // modify this as void fun(){};-> add braces / def.
virtual void funB(){}
};
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I'm using mailslot IPC method to have 2 machines communicate..
But I realized that GetMailslotInfo method which is used to get message,
does not block until it gets some..
It just returns even if there was nothing in slot..
How can we make the method block until it gets some data...?
Best Regards.
Bektek
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Salve,
I'm a developer and I write applications in visual c++ (using eVc++ 4.0) for a Dolphin 9500 . In order to scan barcodes I need to use the functions waConnect(), waDefaultSymbology(), waDisableSymbology(), waEnableSymbology(), waWaitForDecode() and waDisconnect().
I had to include in my project the external dependencies engnapi.h and wadecodece.lib and everything seems to work.
The problem comes out when I try to compile for Debug: the compiler asks for two files: HHPSCANINTERFACE.DLL and WADECODECE.DLL. Both this files are unfoundable for me.
I often need to debug my program, and I really need to solve this problem, have you got any suggestion? Where can I find these files?
(Note: I cannot use ScanWedge to scan my barcodes, so I HAVE TO use the functions written above)
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Hi.
I want to create controls on the dialog box at runtime. I need to convert between dialog units and pixels.
I tried the following:
CFont *pFontDlg= GetFont(); // font of dialog.
LOGFONT logfont;
pFontDlg->GetLogFont(&logfont);
The problem is that the width (logfont.lfWidth)is zero. So I am unable to use the formula. Please help !!!
From : Digambar K. digambar_k2004@yahoo.co.in
Thanks....!!!!
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This is a very bad idea. Dialog units are used for a reason, namely so that a program does not have to be concerned with what resolution and font are currently in use. By hard-coding controls based on pixel size, you have limited the portability of your program to only one computer. See this comment for more.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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I have written a program that used mschart and I install this program on the computer that not installed VC. the problem is if I set chart on the dialog directly,all that is ok.but if I create it in my codes dynamically,chart can not be shown. in my computer this problem does not exist,what is the reason?
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hi
mschart is component usually registered with the MFC. that why u didn't get any problems whem u r working with ur system. If u want to install it some other machine which doesn't have the mschart component, you must explicitly register it with regsrv32 tool
naren
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I have registered this componet
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Please don't advertise in forums. This gets people VERY unhappy.
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We're about to release software -- Cute Skin 2005 -- that makes it very easy, quick and affordable for you to create professional applications with skins that users can customize at run-time.
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Many thanks.
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Hi
Simple question. Why the constructor name has to be same as the class name?
Regards
John
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Funny enough, in C with classes the constructors were called New
My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.
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I want that whenever i type char : and ) it should be replaced.I am using following approch .
void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
CRichEditCtrl::OnChar(nChar, nRepCnt, nFlags);
uPervChar=uNextChar;
uNextChar=nChar;
if(uPervChar==_T(':')&&uNextChar==_T(')'))
{
nEnd=GetWindowTextLength();
nBeg=nEnd-2;
SetSel(nBeg,nEnd);
ReplaceSel("");
}
}
It wroks fine .But its slow .Is there any other way pls tell me.
Learner always
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I need to check somehow when a process starts or exit. Any ideas how we can do this?
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You have to set a HOOK on process of type WH_CBT and listen for WM_QUIT,WM_CREATE Messages.
Api:- SetWindowsHookEx
"I Think this Will Help"
Alok Gupta
visit me at http://www.thisisalok.tk
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I am trying to get data using OLEACC. It works fine when I fetch data from windows xp machine, however it fails to retrieve unicode data from Richedit20A control on windows 2000 machine. It gives ?????? for any of the unicode characters entered.
Anyone have any idea.
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If it works on XP is should work on 2000. Usualy the only time you see ? marks is when the system can not translate from one character code format to anouther. May be you should try making sure that the 2000 machine is up to date as far as the OLEACC is concerned.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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I updated my machine after I found this error.
I even used accexplorer to check if this is some problem with my coding and as I thought, result was all the same, even accexplorer cannot get the data.
I found version numbers of dlls being used by these systems are different with XP having the latest, so I replaced those that I can, but no luck.
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I have a list ctrl and want to sort it when user click the column. In my sort function, i only can get the item's lparam, but i need get the item's index then could use GetItemText function to compare two strings. I find i could use the FindItem to get the item index from the item's lparam, but it seems slow(if items more than 3000, the sort time is too long). So could any one teach me which function or which way I could use to get the item index effectively?
Thank you very much for your help!
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