C / C++ / MFC

Class derived from CDialog

25-Jun-07 22:25

In Windows, I think there's already a logger. check Event Viewer in 'Administrative Tools' in Control panel.

If you still stick with using a text file with your app, you may consider developing an NT Service that after startup and before shutdown of the service gets the current time and date using a time class like:CTime and stores it in a text file.

For writing a simple service Nishant.S. already wrote a perfect article here in CP.

// "Life is very short and is very fragile also." Yanni
while (I'm_alive)
{
cout<<"I love programming.";
}

prithaa25-Jun-07 21:44

prithaa

25-Jun-07 21:44

Hello,

I want to derive a class from CDialog without resource-ID. How should I use InitModalIndirect() for the dialog initialization?
How should I use DLGTEMPLATE and DLGITEMTEMPLATE structure for the derived class?

Prithaa

Re: Class derived from CDialog

Hamid_RT25-Jun-07 22:30

Re: Class derived from CDialog

25-Jun-07 22:30

Do you need to see Dynamic Dialog Class[^]

WhiteSky

Mark Salsbery26-Jun-07 6:56

Mark Salsbery

26-Jun-07 6:56

prithaa wrote:
How should I use DLGTEMPLATE and DLGITEMTEMPLATE structure for the derived class?

That depends on where the dialog template is going to come from. Will you be loading it as a
resource from a module? Will you be creating a template in memory?

The DLGTEMPLATE[^] documentation explains how these structs need to be layed out in memory.

Mark

"Go that way, really fast. If something gets in your way, turn."

Totally confused with memory alocation for '_get_pgmptr' function [modified]

Hamed Musavi25-Jun-07 21:30

Re: Totally confused with memory alocation for '_get_pgmptr' function

25-Jun-07 21:30

Problem solved. Thanks. Rose | [Rose]

I need to use this function in c++ console app, and the documentation says:

errno_t <code>_get_pgmptr</code>( char **pValue );

pValue
A pointer to a string to be filled with ...

So I did this:

	char *path = new char[MAX_PATH+1];
	memset(path, NULL, MAX_PATH + 1);

	<code>_get_pgmptr</code>(&path);
...
        delete[] path;

But the call to the function, changes the address of the pointer(path) and calling the delete will fail.
I thought first that perhaps, I don't need to allocate any memory and the function (oddly) allocates it automatically and sends me the address but this is not the case either. Can anyone tell me what's wrong with this?

-- modified at 8:18 Tuesday 26th June, 2007

Rajkumar R25-Jun-07 21:58

Rajkumar R

25-Jun-07 21:58

Hi,
It gets the current value of the _pgmptr, a global variable which contains the file path. You need not allocate the buffer.
What happen if you pass without allocating?

Re: Totally confused with memory alocation for '_get_pgmptr' function

Hamed Musavi25-Jun-07 22:16

Re: Totally confused with memory alocation for '_get_pgmptr' function

25-Jun-07 22:16

I found the problem was another mistake! You're right and the function gets a pointer to that variable.

I forgot to remove my question here, I guess I posted too soon, before investigating the code completely. Sorry!

Anyway, Thanks a lot for your attention and reply. Smile | :)

// "Life is very short and is very fragile also." Yanni
while (I'm_alive)
{
cout<<"I love programming.";
}

KaЯl25-Jun-07 22:48

KaЯl

25-Jun-07 22:48

No need to strike your question, it could be useful for others Smile | :)

The most wasted of all days is that on which one has not laughed

Fold with us! ¤ flickr

Re: Totally confused with memory alocation for '_get_pgmptr' function

Hamed Musavi26-Jun-07 2:19

Re: Totally confused with memory alocation for '_get_pgmptr' function

26-Jun-07 2:19

Done.

// "Life is very short and is very fragile also." Yanni
while (I'm_alive)
{
cout<<"I love programming.";
}

KaЯl26-Jun-07 2:39

KaЯl

26-Jun-07 2:39

Thanks from the community Smile | :)

When they kick at your front door
How you gonna come?
With your hands on your head
Or on the trigger of your gun?

Fold with us! ¤ flickr

What is the error in this code fragment

xbiju25-Jun-07 21:16

xbiju

25-Jun-07 21:16

Why does te following C++ code flag error?

# include

const int i=10;
void main()
{
const int i = 20;
cout << i << endl << ::i;
cout << &i;
}

The error flagged is "Illegal structure operation in main"
Compiler use : Borland C++ 4.5
How can I access the address of the local and global constant 'i's?

Please help me.

Thanks,

Biju

Re: What is the error in this code fragment

Hamed Musavi25-Jun-07 21:33

Re: What is the error in this code fragment

25-Jun-07 21:33

Nothing is in front of #include

// "Life is very short and is very fragile also." Yanni
while (I'm_alive)
{
cout<<"I love programming.";
}

Hamid_RT25-Jun-07 22:28

Re: What is the error in this code fragment

25-Jun-07 22:28

Your code print 20 with address of i whats the problem?

WhiteSky

Mark Salsbery26-Jun-07 7:08

Mark Salsbery

26-Jun-07 7:08

xbiju wrote:
How can I access the address of the local and global constant 'i's?

Address of local is &i
Address of global is &::i

In the words of WhiteSky, what's the problem? Smile | :)

"Go that way, really fast. If something gets in your way, turn."

Tab Order

_anil_25-Jun-07 20:37

_anil_

25-Jun-07 20:37

I am creating some control over a form at run time.
How to set the tab order for these controls.

Regards
Anil

Hamed Musavi25-Jun-07 21:54

25-Jun-07 21:54

Sorry, I first did not notice it's on runtime.

I'm not sure if it is possible to change tab order at runtime, because as far as I know, controls orders depends on the order they have been created.

I mostly use these 2 function:
GetNextDlgTabItem to get the next control in the focus order
SetFocus to set the focus to a particular control when user presses a key (e.g. Enter = OnOk).

// "Life is very short and is very fragile also." Yanni
while (I'm_alive)
{
cout<<"I love programming.";
}

Hamid_RT25-Jun-07 22:32

25-Jun-07 22:32

See here[^]

WhiteSky

Hamed Musavi25-Jun-07 22:41

25-Jun-07 22:41

Your right. It changes z order and place it after the first handle.

I already used this API several times, but never for this purpose.

Thanks, I learned something Smile | :)

// "Life is very short and is very fragile also." Yanni
while (I'm_alive)
{
cout<<"I love programming.";
}

Hamid_RT25-Jun-07 22:21

25-Jun-07 22:21

See this[^] thread.

WhiteSky