C / C++ / MFC Discussion Boards

Re: Change selection in CListCtrl with keys?

Nishad S27-Jan-09 18:01

Nishad S

27-Jan-09 18:01

Naveen wrote:
he is my friend and we both work in same company

Please don't tell the truth... Big Grin | :-D

- ns ami -

MSMQ - Opening a Private Queue through windows service

Md Saleem Navalur27-Jan-09 0:27

Md Saleem Navalur

27-Jan-09 0:27

I have an application, where i open the private Queue. This works fine.
But when I run this app as a windows service, it gives an error failed to open the Queue, Access is denied.

I know it has got to do something with the rights.

If the app is run as an exe, it will have the logon credentials. When run as windows service it will run with System credentials, which may not have access to Private Queue.

How do i enable my windows service to have access to the private Queue???

Any help will be great.

Thanks,
Saleem

Re: MSMQ - Opening a Private Queue through windows service

led mike27-Jan-09 4:44

led mike

27-Jan-09 4:44

Md Saleem Navalur wrote:
How do i enable my windows service to have access to the private Queue???

Did you try setting the Log On Properties for the service to use the same account as the queue?

Re: MSMQ - Opening a Private Queue through windows service

Md Saleem Navalur27-Jan-09 22:51

Md Saleem Navalur

27-Jan-09 22:51

Yes i tried that, it works.

Stack Trace [modified]

baerten27-Jan-09 0:06

baerten

27-Jan-09 0:06

Hello everybody,

is it possible to determine at realtime the function which has called the current function?

Example

void A(void)
{
  DoWork();
}

void B(void)
{
  DoWork();
}

void DoWork(void)
{
  char *trace = GetTraceOf5LastFunction();
  OutputDebugString("DoWork called from function : ");
  OutputDebugString(trace);
}

Is it possible?

Big thanks for any help Smile | :)

Edit:

I have found a fonction called "backtrace" which is placed into execinfo.h
But i don't have a such header-file on my system (Visual Studio)

modified on Tuesday, January 27, 2009 6:26 AM

Re: Stack Trace

Hamid_RT27-Jan-09 0:35

Hamid_RT

27-Jan-09 0:35

Can you use of dll's you can load your functions of dll on the current function.

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Re: Stack Trace

baerten27-Jan-09 0:59

baerten

27-Jan-09 0:59

Is there a DLL which executes the work of backtracing?

Re: Stack Trace

Luc Pattyn27-Jan-09 1:53

Luc Pattyn

27-Jan-09 1:53

Hi,

the easiest way may well be the low-tech one: add a string parameter to the function, and pass the caller's name. That works no matter what.

DoWork("A");

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets

modified on Tuesday, January 27, 2009 8:10 AM

Re: Stack Trace

baerten27-Jan-09 3:29

baerten

27-Jan-09 3:29

This method is the simplest, but i can't write over 100 Debug-Lines into the code Smile | :)

But thanks anyway Wink | ;)

Re: Stack Trace

Randor 27-Jan-09 8:16

Randor

27-Jan-09 8:16

Hi baerten,

I agree with Luc. However you may be able to use a pre-defined macro[^] something like below:

VOID FunctionB(int iVal,char *caller,int line)
{
	char szBuf[MAX_PATH];
	sprintf(szBuf,"I was called by %s on line %d",caller,line);
	MessageBoxA(NULL,szBuf,0,0);
}

VOID FunctionA()
{
	FunctionB(1,__FUNCTION__,__LINE__);
}

baerten wrote:
i can't write over 100 Debug-Lines into the code

A stack trace is several times more expensive at runtime.

Best Wishes,
-David Delaune

Re: Stack Trace

Stuart Dootson27-Jan-09 6:04

Stuart Dootson

27-Jan-09 6:04

You need a stack walking function. Here are some[^] links[^] that may be useful.

The second is probably best - John Robbins is a well regarded expert on debugging and things like that. His SUPERASSERT code includes stack tracing code - see the dialog screenshot about half way through the article for an example of what you can get. Obviously you only need the last item in the trace.

One last thing - IIRC, without debug symbols, all you're going to get is the address that called you, not a function name.

Database implementation in VC++

Ravi00326-Jan-09 23:22

Ravi003

26-Jan-09 23:22

Hi,

I want to perform basic operations on database like add,update,delete using VS2005 and SQLServer 2005.

Which are the set of functions to work with this?

Please suggest any useful link to start with.

Thanks in advance. Smile | :)

Re: Database implementation in VC++

Rahul Vaishnav26-Jan-09 23:48

Rahul Vaishnav

26-Jan-09 23:48

Hi,
below links will be helpful

http://www.codeproject.com/KB/database/[^]

http://blog.csdn.net/sheismylife/archive/2006/08/20/1099254.aspx[^]

http://www4.dogus.edu.tr/bim/bil_kay/prog_dil/c++/ch16.htm#TheComponentsofanOLEDBApplication[^]

http://msdn.microsoft.com/en-us/library/s8852x2h(VS.80).aspx[^]

Re: Database implementation in VC++

Ravi00327-Jan-09 0:50

Ravi003

27-Jan-09 0:50

Thanks Rahul for your help. Smile | :)

Re: Database implementation in VC++

Hamid_RT27-Jan-09 0:31

Hamid_RT

27-Jan-09 0:31

You can use of CDatabase class and see this[^] example.

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Re: Database implementation in VC++

Ravi00327-Jan-09 0:51

Ravi003

27-Jan-09 0:51

Thanks Hamid for ur help. Can you plz tell me how can i find sample for ODBC with VC++?

Memory usage

Sunil P V26-Jan-09 22:46

Sunil P V

26-Jan-09 22:46

Hi All,

This query is regarding memory issue on WinXP (SP2). I have a simple application developed on MSVS2005 IDE. I am observing a peculiar behaviour of this application's memory usage when run on XP(SP2) machine:
Internally i make use of the COM interface to access the database - MSADO.

1. WinXP(SP2 with WLAN API patch) - Memory usage around 9Mb
2. WinXP(Microsoft IDE 2005 with SP2 with WLAN API patch) - Memory usage around 26Mb

Do anyone have any idea behid this dire memory consumption when the application is run on XP with Visual Studio being installed.

Thanks in advance for your time and support...

Sunil

Re: Memory usage

Stuart Dootson26-Jan-09 23:20

Stuart Dootson

26-Jan-09 23:20

Some questions -

Is this a debug or release build
Are you running the application under VS2005 when you get the 26MB memory usage

Maybe you could use Dependency Walker[^] to see what DLLs are being loaded into the executable, maybe some of them are Visual Studio related?

Re: Memory usage

Randor 27-Jan-09 11:45

Randor

27-Jan-09 11:45

Hi Sunil,

Microsoft Windows will map many extra DLL's into your process space which do not appear in a PE image dependency walker. These extra libraries which are mapped into your process can be completely different on each users machine.

Some examples of extra dynamic link libraries which could be mapped into your process:

1.) AppInit_DLLs[^]
2.) Window Hooks[^]
3.) Application Compatibility Layer[^] (Much of the AppCompat/Shim Engine is NDA undocumented)
4.) Device Drivers may map extra DLL's into a process.

If you want to visually inspect which libraries are loaded in each situation then I would recommend downloading Process Explorer by Mark Russinovich[^]. You can export your process information to a text file and differentiate them.

Best Wishes,
-David Delaune

searching in list taking very long time

VCProgrammer26-Jan-09 22:44

VCProgrammer

26-Jan-09 22:44

Hi all,

I have made a Report style List control in my Dialog based application. I have two columns and I want to compare first column value with second column value i.e it will perform a linear search for comparing items. My problem is sometimes my list has thousands of item so it takes very long time for doing so.... my second list items are sorted.....

Can anybody tell me how to reduce searching time and make my program run faster.....

Thanks in advance......

Re: searching in list taking very long time

Stuart Dootson26-Jan-09 23:15

Stuart Dootson

26-Jan-09 23:15

I would (pretty much always) hold the data separate from the list control (using the LVS_OWNERDATA[^] style). That way you compare data using some container (STL rather than MFC, please, for me) which will be much quicker than by putting the data in the list control.
As the second column is sorted, you can search through it using a binary search[^], which the STL has built-in....although you want to use lower_bound[^] rather than the more obvious binary_search[^]

HTH!

Text File Access with specific path.

mac_g26-Jan-09 22:31

mac_g

26-Jan-09 22:31

Hi,

I'm c++ beginner.

Can you help me,
because I dont know how to "specify the path"
of the text file i want to access.

thanks.

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
// "path of input.txt"
ifstream iFile("input.txt");

while (!iFile.eof())
{
int x;
iFile >> x;
cerr << x << endl;
}

return 0;
}

Re: Text File Access with specific path.

Cedric Moonen26-Jan-09 22:48

Cedric Moonen

26-Jan-09 22:48

What's your problem exactly ? Just pass the path to your file to the ifstream constructor. Be carefull when passing the character '\', you'll need to escape it (e.g. something like this "folder1\\folder2\\myFile.txt").
If you are using relative path, you need to take care of your working directory. The working directory is configured through your project options.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Text File Access with specific path.

mac_g26-Jan-09 22:56

mac_g

26-Jan-09 22:56

because I want to add exact path in the code just like in
vb command "Open Path & Filename For Input As #1"

thanks

Re: Text File Access with specific path.

Cedric Moonen26-Jan-09 23:01

Cedric Moonen

26-Jan-09 23:01

Err sorry, I have no idea what "Open Path & Filename For Input As #1" does.
What do you mean by exact path ? Did you try my suggestion ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.