C / C++ / MFC

30-Jun-06 3:58

I'm trying to printout the time and date and i'm doing this:

	<br />
#include <ctime><br />
<br />
char *tm = ctime(NULL);<br />
char *fileName = "";<br />
<br />
fileName = "C:\\output";<br />
strcat(fileName, tm);<br />
strcat(fileName,".txt");<br />
AfxMessageBox(fileName);<br />

but when I run it i get the following error:
Debug Assertion Failed!
ProgramL...
File: ctime64.c
Line: 90

Expression: (timp != NULL)

What am I doing wrong?

Kitty5

Re: ctime() printing [modified]

Cedric Moonen30-Jun-06 4:02

Cedric Moonen

30-Jun-06 4:02

You are messing a little bit how strings works. I suggest you use the strings from the STL (std::string), they will manage all these problems for you.

Cédric Moonen
Software developer

Charting control

Viorel.30-Jun-06 4:08

Viorel.

30-Jun-06 4:08

You did not allocate space for fileName. You can first try this:

char *tm = ctime(NULL);
char fileName[1000];
strcpy(fileName, "C:\\output");
strcat(fileName, tm);
strcat(fileName,".txt");
AfxMessageBox(fileName);

Then you can switch to CString:

CString s;
s.Format("C:\\output%s.txt", ctime(NULL));
AfxMessageBox(s);

And next you can make it work in both Ansi and Unicode versions:

CString s;
s.Format(_T("C:\\output%s.txt"), _tctime(NULL));
AfxMessageBox(s);

I hope it works.

-- modified at 10:10 Friday 30th June, 2006

kitty530-Jun-06 4:29

Re: ctime() printing [modified]

30-Jun-06 4:29

Viorel. wrote:
CString s;
s.Format("C:\\output%s.txt", ctime(NULL));
AfxMessageBox(s);

ok so I tried this but I still have that original error with the ctime() function of:
Debug Assertion Failed!
ProgramL...
File: ctime64.c
Line: 90

Expression: (timp != NULL)

Kitty5

Viorel.30-Jun-06 4:36

Viorel.

30-Jun-06 4:36

This means that ctime does not accept NULL parameter. Try this:

time_t t = time(NULL);

and then path &t to ctime: ctime(&t).

Hope it helps.

-- modified at 10:37 Friday 30th June, 2006

kitty530-Jun-06 5:34

30-Jun-06 5:34

Thanks Viorel!

Kitty5

Jun Du30-Jun-06 4:12

30-Jun-06 4:12

Pass NULL, get NULL. You should code this way:

#include <time.h>
time_t ltime;
time( &ltime );
char *tm = ctime(&ltime);

Best,
Jun

kitty530-Jun-06 4:26

30-Jun-06 4:26

Jun Du wrote:
time_t ltime;
time( <ime );
char="" *tm="ctime(<ime);" <="" blockquote="">

what is

Jun Du30-Jun-06 4:33

Re: ctime() printing [modified]

30-Jun-06 4:33

In my previous post, can you see proper code? Your post looks weired here. There seem to be some problems with the posting, even I've disabled HTML tags. (I'm using Linux at work)

Anyhow, ctime(const time_t *time_val) works this way.

Best,
Jun

kitty530-Jun-06 4:40

30-Jun-06 4:40

the code is see is:
#include <time.h>
time_t ltime;
time( <ime );
char *tm = ctime(<ime);

Kitty5

-- modified at 10:40 Friday 30th June, 2006

Jun Du30-Jun-06 4:42

30-Jun-06 4:42

Ok, < should be &.

Best,
Jun

David Crow30-Jun-06 4:44

David Crow

30-Jun-06 4:44

Don't use <> directly. Use the <> buttons above the smileys.

#include <ctime>
 
time_t t = time(NULL);
char *tm = ctime(&t);
char fileName[256] = "C:\\output";
strcat(fileName, tm);
strcat(fileName,".txt");
AfxMessageBox(fileName);

Since you are using MFC, why mess with char* and strcat()?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Jun Du30-Jun-06 4:52

30-Jun-06 4:52

Thanks for this

DavidCrow wrote:
Use the <> buttons above the smileys.

Best,
Jun

Zac Howland30-Jun-06 5:00

Zac Howland

30-Jun-06 5:00

DavidCrow wrote:
Since you are using MFC, why mess with char* and strcat()?

And on that note, why not just use CTime or COleDateTime? Both of which have format methods that will allow you to print out a timestamp in any format you wish.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

kitty530-Jun-06 5:35

30-Jun-06 5:35

Thanks you guys!
You all ROCK!

Kitty5

ToolTips

muravi30-Jun-06 3:27

30-Jun-06 3:27

how we can put tooltips to the listbox items.
if i point to any particular item it must get tooltip and it will show the name of the item.
please help me,urgent.
murty.

vsn

Re: ToolTips

_AnsHUMAN_ 30-Jun-06 3:35

_AnsHUMAN_

30-Jun-06 3:35

See Here[^]

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

_AnShUmAn_

Re: ToolTips

muravi30-Jun-06 4:10

30-Jun-06 4:10

thanks

vsn

a snapshot

V_shr30-Jun-06 2:54

V_shr

30-Jun-06 2:54

Hello
I want to take a snapshot from a webcam and save it to a file . but I dont know how to do it , can you help me?
thanks

Re: a snapshot

C^hris L^osinger30-Jun-06 4:11

C^hris L^osinger

30-Jun-06 4:11

step 1: consult the webcam documentation (or the manufacturer) and see what kind of interfaces the webcam exposes.

Cleek | Image Toolkits | Thumbnail maker

how we add WM_TIMECHANGE

muravi30-Jun-06 2:43

Re: how we add WM_TIMECHANGE

30-Jun-06 2:43

how we add WM_TIMECHANGE message to our project please tell me

vsn

_AnsHUMAN_ 30-Jun-06 3:09

_AnsHUMAN_

30-Jun-06 3:09

In the header file declare
afx_msg void OnTimeChange();
In .cpp file
void CTEstDlg::OnTimeChange()
{
CDialog::OnTimeChange();

}
And in the begin message map section do this
ON_WM_TIMECHANGE()

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

_AnShUmAn_

Re: how we add WM_TIMECHANGE

muravi30-Jun-06 3:24