C / C++ / MFC Discussion Boards

Michael P Butler1-Oct-01 23:01

1-Oct-01 23:01

The docs say

Returns Nonzero if successful; otherwise 0. If the call fails, the Win32 function GetLastError may be called to determine the cause of the error.

Looking through the FTP code, there doesn't seem to be any code to throw an exception.

Michael Smile | :)

Re: A question about CFtpConnection

Chaos Lawful2-Oct-01 1:18

Chaos Lawful

2-Oct-01 1:18

But when I use SetCurrentDirectory in CFtpConnection calss, I sometimes got a error message from WININET.DLL and KERNEL32.DLL. I don't know why. Could you explain it? Confused | :confused:

Law is meaningless without chaos.
Chaos without Law is equal to destruction.
Chaos and Law create our rich and colorful world.

Adv: How does e.g. Dr Watson hook into an exception

EiSl1-Oct-01 22:13

EiSl

1-Oct-01 22:13

Hello fellow programmers,

I was wondering how a program like Dr.Watson is hooked into the exception handling mechanism.

This question actually has a background:
For my next project, they've asked me to do some bug-hunting in a HUGE (multi threaded) service process (netto > 1 mil. lines of code over 10.000 files). This peace of code (telecommunication related) has been ported from embedded system, and NO active usage of structured exception handling is used (more C than C++ oriented).
The problem is that in some situations an exception occures, and we want to be able to produce *any* possible kind of info. But since the Windows NT exception handling mechanism is taking over everything, no way of getting some runtime-info. And also: it is a service process, so no interface to user exists.

My idea was to implement a kind of 'general exception handling' function within our application, dumping possible information to a file.

Other suggestions are also welcome, or links to site/topics regarding this topic.

Cheers,

EiSl

Re: Adv: How does e.g. Dr Watson hook into an exception

Christian Graus1-Oct-01 22:30

Christian Graus

1-Oct-01 22:30

Buy John Robbins Debugging Applications (Microsoft Press). I've read it once, so I know it covers everything you want to know and more, but I've not had enough time to read it often enough to actually answer the question without looking it up. I doubt I could do it justice in any case, you need this book.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: Adv: How does e.g. Dr Watson hook into an exception

Tomasz Sowinski2-Oct-01 0:24

Tomasz Sowinski

2-Oct-01 0:24

> I was wondering how a program like Dr.Watson
> is hooked into the exception handling mechanism.

It's actually a debugger. I suggest reading April 1997 issue of MSJ; there's a column titled 'Under The Hood' by Matt Pietrek. The article presents a way to set the default exception filter per-thread basis. It should be in your VC++ help (look in the 'Periodicals' section), if it's not there, go to MSDN Online.

Tomasz Sowinski -- http://www.shooltz.com

How to create a grid control?

1-Oct-01 21:04

I was wondering how to create a simple grid, using the win32 api only.
Dont want to use MFC or something like that. I cant find any predefined
control classes like BUTTON, EDIT and so on to pass in to CreateWindow()..

So howto do it?

Re: How to create a grid control?

Christian Graus1-Oct-01 22:33

Christian Graus

1-Oct-01 22:33

There is no grid control provided with VC except as an OCX. You'll need to create a window, draw it yourself and respond to messages yourself. Chris has done an excellent job of doing this with MFC, and others have ported it to WTL, all available on the site.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: How to create a grid control?

1-Oct-01 23:34

Oh.. Well, I started to expect that. I'm used to c++ builder, were you got a grid control just a mouseclick away, now I'm going to port a project to windows ce, cant use builder then... The MFC grid by Chris looks great, but a bit to complex for my needs... Not sure it would run on ce without some changes.

I'm leaning towards just stacking some edit controls together and doing some functions to achieve grid type functionality. Smile | :)

Re: How to create a grid control?

Michael P Butler2-Oct-01 0:03

Michael P Butler

2-Oct-01 0:03

I think that the grid control has already been converted to run on CE.

Michael Smile | :)

SYSTEM HOOKS - can't access global variables !!!

dudy_boy1-Oct-01 20:39

dudy_boy

1-Oct-01 20:39

Hi !!

I have this DLL in which i the global system hook procedure. also there is an installing and an uninstalling function which i have exported and use it in a separate EXE. i am not going in for shared data segments coz only my process is gonna use this hook.

now i have declared a global flag in the DLL which i want the hook to set upon invocation. now the hook is invoked but it does not set the flag !!
i saw a number of examples on hooks but all examples use PostMessage(). the thing is that i don't want to communicate with the server. i just want to set a global variable in the DLL using the hook, so PM() doesn't make sense.

could you plz suggest something??? i am in dire straits

Dead | X|

regards,
Faiz.

Re: SYSTEM HOOKS - can't access global variables !!!

Tomasz Sowinski2-Oct-01 0:04

Tomasz Sowinski

2-Oct-01 0:04

Use #pragma data_seg. More details in MSDN and in KB article Q125677.

Tomasz Sowinski -- http://www.shooltz.com

Question about CSocket

Chaos Lawful1-Oct-01 20:11

Chaos Lawful

1-Oct-01 20:11

Do functions in CSocket class throw exceptions? Confused | :confused:

Law is meaningless without chaos.
Chaos without Law is equal to destruction.
Chaos and Law create our rich and colorful world.

Re: Question about CSocket

markkuk1-Oct-01 21:55

markkuk

1-Oct-01 21:55

Yes, at least searching through MFC source shows an AfxThrowResourceException() in CSocket::PumpMessages(), and other AfxThrow*()s in CAsyncSocket and CSocketFile code.

Re: Question about CSocket

Chaos Lawful2-Oct-01 18:09

Chaos Lawful

2-Oct-01 18:09

Thanks a lot Smile | :)

Law is meaningless without chaos.
Chaos without Law is equal to destruction.
Chaos and Law create our rich and colorful world.

conversion constructor

1-Oct-01 17:02

Can anyone tell meho w to put a conversion constructor in this and implement it?

Matt

#include <iostream.h>
#include <string.h>
#define maxString 32000

class myString
{
int length;
char *stringData;
public:
myString();
myString(myString &);
int lengthof();
void show();
void getString();

};

myString::myString() // default constructor
{
length = 0;
stringData = new char[1];
}

myString::myString(myString &) //copy constructor
{}

void myString::getString()
{
char *firstString = new char[maxString];
cout << "Enter String: ";
cin.getline(firstString,maxString);
length = strlen(firstString);
stringData = new char[length];
for (int I=0;I

Re: conversion constructor

Michael Dunn1-Oct-01 19:34

Michael Dunn

1-Oct-01 19:34

Not sure what you mean by a "conversion constructor". If you mean a copy constructor, then the prototype needs to be myString::myString( const myString& ) Note the parameter is a constant reference, your current code is missing the const.

--Mike--
http://home.inreach.com/mdunn/
Heart | [heart]

your

with

and

MFC FILETIME late?

JaGGeR1-Oct-01 16:58

JaGGeR

1-Oct-01 16:58

Well, I was trying to display the date/time stamp (last modified) of a file using the following:

FILETIME ftTmp;
SYSTEMTIME stTmp;

GetFileTime( hFile, NULL, NULL, &ftTmp );
FileTimeToSystemTime( &ftTmp, &stTmp );

And I have noticed that the time I have derived was always 8 hours late. This is true to all the files I tried to read the info from. Am I doing something wrong here? Are there initializations needed? Is this a problem of MFC?

Any help/comment would be appreciated. Thanx!!!

Ryan V. - ryan@mobiling.nec.co.jp
----------------------------------
Discovery consists of looking at
the same thing as everyone else
and thinking something different.
----------------------------------

Found it!!! :-D

JaGGeR1-Oct-01 17:36

JaGGeR

1-Oct-01 17:36

I was still looking around to solve my particular problem and I came across this function: FileTimeToLocalFileTime()

And added this to my code:

FILETIME ftTmp, ftLocal;
SYSTEMTIME stTmp;

GetFileTime( hFile, NULL, NULL, &ftTmp );
FileTimeToLocalFileTime( &ftTmp, &ftLocal );
FileTimeToSystemTime( &ftTmp, &stTmp );

This seems to solve my problem. The time returned by GetFileTime was UTC based and I still have to convert it to local time. This would account for the 8 hours discrepancy 'coz my current location is GMT+08:00.

Hehehe... I solved my own problem. Blush | :O

Ryan V. - ryan@mobiling.nec.co.jp
----------------------------------
Discovery consists of looking at
the same thing as everyone else
and thinking something different.
----------------------------------

Deriving classes - Stacked Dialogs: HELP!

Ashman1-Oct-01 14:47

Ashman

1-Oct-01 14:47

http://www.codeproject.com/dialog/stackdialog.asp

A great example with exactley what I need in my program. One problem....how do I derive my dialogs to TStacked Dialog thingy?

Argh if someone can explain this to me and how to get this working in my app, please Id appreiciate it very very much!

Thanks
Ashley 'Ashman' Rowe
www.settlers.net

Re: Deriving classes - Stacked Dialogs: HELP!

Michael P Butler1-Oct-01 23:06

Michael P Butler

1-Oct-01 23:06

I'm not quiet sure what your problem is. Have you looked at the demo project with the article.

Create your dialog resource as normal, create a class for CDialog and then edit the code and replace CDialog with TStackedDialog and make the other changes the article describes.

hope this helps,

Michael Smile | :)

Re: Deriving classes - Stacked Dialogs: HELP!

Ashman2-Oct-01 13:28

Ashman

2-Oct-01 13:28

Thanks man! I will try that....Sounds so easy here I am thinkin there is an option to derive from a class LOL!!

Thanks again
Ashman
www.settlers.net

Using CTabCtrl...

Mr.Freeze1-Oct-01 14:36

Mr.Freeze

1-Oct-01 14:36

Hi,

It seems quite complicated to use tab controls. I tried many times to get it work, but without success... Cry | :((

Could someone briefly explain me how to get things working? What are the different steps?

Thanks very much for your help Smile | :)

HElpp

1-Oct-01 12:23

I am in c++ class in 9th grade and I need to make a win32 concole app, that has 6 options 1 generates a random nubmer another tellis if it is greater then 25 and less then 100, the other function is it generates a random number and the other let's me enter as many number's as a like intell I enter zero and avearages those numbers not including 0, then whatever I chose to make as a function, then a quit option!!!!!!!! PLEASE HELP I HAVE NO IDEAD CAN SOMEONE please help me make a menu ETC Give me any ideas.

Re: HElpp

Christian Graus1-Oct-01 13:51

Christian Graus

1-Oct-01 13:51

Do you have any books to help you, like textbooks ? This is a *very* basic question, do you have any ideas at all ? You really should start by writing some code and posting it so that we can provide some help for you to learn, as opposed to writing a very basic C++ program that you can hand in, and you'll be back here when your next assignment is due.

Clue 1: Look up cin and cout.
Clue 2: Look up switch or if/else ( which is how switch is implimented )
Clue 3: Look up rand/srand

That's all you need actually. Feel free to post your code, or snippets of it you have trouble with, and both myself and others will be glad to point you in the right direction.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

OnTimer(UINT nIDEvent)

RobJones1-Oct-01 12:01

RobJones

1-Oct-01 12:01

Hello,
I have a dialog type app and I have 2 timers on the app, one timer displays the current time, and the other is a count down timer.. The problem I am having is that the count down timer is not very accurate.. it looses a few seconds every 10 minutes.. Is there another function other than OnTimer() that I can use that is exact? If so can someone provide me with a little code so I have a idea on how to use it..

Here is a small sample of the OnTimer function I am using.. I doubt there is anything wrong with it...

void CTimerDlg::OnTimer(UINT nIDEvent) 
{
	//Which timer triggered this event?
	switch (nIDEvent)
	{
		//The Current Time?
	case IDC_STATIC_TIMER1:
		//Display the current time
		m_timer1.DisplayCurrentTime();
		break;
		//The Count Down Timer?
	case IDC_STATIC_TIMER2:
		//decrement the count
		iS --;
		//format and display the count
		m_timer2.Display(iS,iM,iH,iD,(CString)m_strTimer2="%D:%H:%M:%S");
		break;
	}
	CBitmapDialog::OnTimer(nIDEvent);

Thanks,
Rob

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