C / C++ / MFC

cmk1-Jul-08 5:01

cmk

1-Jul-08 5:01

1. - A given module will be mapped into a single continuous block of memory.
- For a program with multiple modules, the modules may not be in adjacent blocks of memory, there may be gaps.
- Within a module there may be more than 1 code and/or data blocks, these may not be adjacent.

2.
You will have to read the instructions for the debugger.
If WinDbg isn't showing the symbols then either:
- the module was not compiled with symbols (e.g. release build)
- windbg isn't setup right, the symbols server/paths are wrong
- the address isn't at the start of a symbol and winddbg isn't looking for the nearest symbol

You can always write a windbg extension and use the windbg api GetSymbol().
See:
http://www.codeproject.com/KB/debug/cdbntsd4.aspx[^]
http://72.14.205.104/search?q=cache:w_6GRVNQR5wJ:www.osronline.com/article.cfm%3Fid%3D52+windbg+getsymbol&hl=en&ct=clnk&cd=3&gl=ca[^]

Maybe if we step back and you explain exactly what you are trying to do it might be easier. It's been years since i needed a debugger other than the one built into VS.

...cmk

The idea that I can be presented with a problem, set out to logically solve it with the tools at hand, and wind up with a program that could not be legally used because someone else followed the same logical steps some years ago and filed for a patent on it is horrifying.
- John Carmack

George_George2-Jul-08 2:04

2-Jul-08 2:04

Cool cmk!

I like both the article and the forum you recommended.

What I am trying to do is to solve a sort of specific issues, when there is OS error box which indicates my application is broken at some address (e.g. 0x12345678), because of unhandled exception or something. I want to find out what actually resides in address 0x12345678? Is it code or data?

Any advice or documents to refer?

regards,
George

cmk2-Jul-08 5:57

cmk

2-Jul-08 5:57

You said it is your app, i would suggest running it in Visual Studio, the debugger is easier to use than WinDbg.

The address alone is just a starting point, it may be a side-effect of the actual error. You need more information that that.

I'm sure you realize that debugging is an art, there is no single way to do it, but it starts with coding defensively.

I would suggest getting one of John Robbins debugging books: http://www.wintellect.com/Books.aspx[^], i have 'Debugging Applications'.

Also check out his BugSlayer articles, a collection can be found here ...[^].

George_George4-Jul-08 2:42

4-Jul-08 2:42

Thanks cmk!

Great link! My issue is, on the target machine, we can not install Visual Studio, and could I use Visual Studio on local machine to debug on the remote machine's process? If yes, how?

regards,
George

cmk4-Jul-08 6:55

cmk

4-Jul-08 6:55

Yes, Visual Studio C++ (not express version) supports remote debugging.

http://msdn.microsoft.com/en-us/library/xf8k2h6a.aspx[^]

http://www.codeproject.com/KB/debug/remotedebug.aspx[^]

http://www.eastcoastgames.com/articles/MSVCRemoteDebug.htm[^]

http://www.nachreiner.com/remotedebug/[^]

http://www.highprogrammer.com/alan/windev/visualstudio.html[^]

...

I you are not able to install any files on the target machine then you will have to add code that dumps out diagnostic information.

George_George6-Jul-08 16:29

Random numbers [modified]

6-Jul-08 16:29

Thanks cmk!

I have read the documents carefully. My current confusion is, as mentioned here and in also other documents,

http://www.nachreiner.com/remotedebug/[^]

we need to copy some DLLs, but the DLL names are for old VC 6.0, and for current Visual 2008, what are the related DLL names?

--------------------
Copy the following files from the HOST to the TARGET machines system directory
MFC42D.DLL
MFCO42D.DLL
MSVCRTD.DLL

Copy the following files from the HOST to the TARGET machines.
DM.DLL
MSDIS110.DLL
MSVCMON.EXE
MSVCP60.DLL
PSAPI.DLL
TLN0T.DLL
--------------------

regards,
George

gordon305629-Jun-08 19:04

gordon3056

29-Jun-08 19:04

I'm trying to generate random numbers with

#include <stdio.h>

void main( )
{

int iRandom = 0;
iRandom = ( rand( ) % 100 ) + 1;
printf( "\n\n%d", iRandom );

}

the result is 42 everytime any help please

Microsoft visual c++ 9.0 / Vista

<div class="ForumMod">modified on Monday, June 30, 2008 1:13 AM</div>

Re: Random numbers

«_Superman_»29-Jun-08 19:16

«_Superman_»

29-Jun-08 19:16

Try to put this line

srand( (unsigned)time( NULL ) );

before calling rand();

-Santosh

« Superman »

Re: Random numbers

gordon305629-Jun-08 19:24

gordon3056

29-Jun-08 19:24

Thanks thats it

Re: Random numbers

_AnsHUMAN_ 29-Jun-08 19:19

_AnsHUMAN_

29-Jun-08 19:19

you should use srand if you want the sequence to start with a different number each time. Otherwise it always gets seeded to 1, and on your compiler (Visual C++, I'm guessing) the first number generated with a seed of 1 is 41.
The result is displayed as 42 since you always add 1 to the random number.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Number property(Use only digits) of EditBox.

Le@rner29-Jun-08 18:46

29-Jun-08 18:46

Hi all,

I m using Number property for Edit box,becoz i want to use only digits.

But i also want to enter ".",but it is not accept it please tell me how can i Number property of Edit box where i m also use ".".

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

Naveen29-Jun-08 19:10

Naveen

29-Jun-08 19:10

"_$h@nky_" wrote:
how can i Number property of Edit box where i m also use ".".

You cannot. If you want such a feature, you should handle the WM_CHAR message and filter the unwanted keys..

nave

[OpenedFileFinder]

Le@rner29-Jun-08 19:44

29-Jun-08 19:44

Can you please tell me with example.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

MANISH RASTOGI29-Jun-08 20:35

MANISH RASTOGI

29-Jun-08 20:35

void CNumericEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
char szBuffer[100] = {0};
short int nCounter = 0;
short int iTemp = 0;
int iStartChar = 0;
int iEndChar = 0;

if(nChar == '-')
{
return;
}

if(nChar != VK_BACK && nChar != VK_TAB)
{
if(nChar != '.' && (nChar < '0' || nChar > '9'))
{
return;
}

GetWindowText(szBuffer, sizeof(szBuffer));

if(nChar == '.')
{
GetSel(iStartChar, iEndChar);

if(iStartChar != 0 || iEndChar != static_cast<int>(strlen(szBuffer)))
{
for(nCounter = 0; szBuffer[nCounter] != NULL; nCounter++)
{
if(szBuffer[nCounter] == '.')
{
return;
}
}
}
}
}

CEdit::OnChar(nChar, nRepCnt, nFlags);
}

Le@rner29-Jun-08 20:44

29-Jun-08 20:44

this error comes out when i use the above code.

error C2248: 'CWnd::OnChar' : cannot access protected member declared in class 'CWnd'
1> C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin.h(2631) : see declaration of 'CWnd::OnChar'
1> C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin.h(1967) : see declaration of 'CWnd'
1>

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

MANISH RASTOGI30-Jun-08 2:08

MANISH RASTOGI

30-Jun-08 2:08

Subclass CEdit.

Le@rner30-Jun-08 2:12

30-Jun-08 2:12

How can i do this?

I m using edit box and other controls on Dialog box,so the base class is CDialog.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

MANISH RASTOGI30-Jun-08 2:24

MANISH RASTOGI

30-Jun-08 2:24

Derive a new class from CEdit and override OnChar.
In dialog create a member variable of new Class derived from CEdit.
In DoDataExchange of dialog write
DDX_Control(pDX, <edit control="" id="">, <object of="" derived="" cedit="" class="">);

If you still do not get please see articals which is available in codeproject.

Le@rner30-Jun-08 19:38

30-Jun-08 19:38

Thanks.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer30-Jun-08 2:13

30-Jun-08 2:13

In addition to the other reply, look through the Edit Controls under the Masked section
http://www.codeproject.com/KB/edit/#Edit%20Controls%20-%20Masked%20and%20Validating%20controls[^]
for example code.

You are not the first person with this problem by *miles*. There are good CEdit dropins there with all sorts of nice features, like tooltips, text in grey when your box is empty, etc...

Iain.

Plz sir... ^CPallini ^CPallini abuz drugz, plz plz help urgent.

three questions about CoInitialize/CoUninitialize

David Crow30-Jun-08 3:11

David Crow

30-Jun-08 3:11

Have you considered a masked edit control?

"Love people and use things, not love things and use people." - Unknown

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

George_George29-Jun-08 17:36

Re: three questions about CoInitialize/CoUninitialize

29-Jun-08 17:36

Hello everyone,

Am I correct for the understanding of the following three questions about CoInitialize/CoUninitialize?

1.

For each thread which utilizes COM, we need to call CoInitialize/CoUninitialize. Not for each process.

2.

There is no harm to call CoUninitialize even if we do not call CoInitialize? And if we call CoInitialize N times on a thread, we need to call CoUninitialize the same of times (N times, not only 1 time) on a thread to release all resources?

3.

CoInitializeEx will invoke CoInitialize?

thanks in advance,
George

Naveen29-Jun-08 17:44

Naveen

29-Jun-08 17:44

George_George wrote:
For each thread which utilizes COM, we need to call CoInitialize/CoUninitialize. Not for each process.

yes

George_George wrote:
And if we call CoInitialize N times on a thread, we need to call CoUninitialize the same of times (N times, not only 1 time) on a thread to release all resources?

yes

George_George wrote:
CoInitializeEx will invoke CoInitialize?

No. But CoInitialize calls CoInitializeEx with concurrency model as single-thread apartment.

nave

[OpenedFileFinder]

Re: three questions about CoInitialize/CoUninitialize

George_George29-Jun-08 18:02