C / C++ / MFC

20-Aug-02 4:48

hi i have a function called

<br />
writetofile(const char* filename)<br />
{<br />
  FILE *stream;<br />
  stream = fopen(filename,"a+");<br />
   fprintf( stream,"%s",strptr); // printing the orginal string <br />
   fprintf(stream," ");<br />
  fclose(stream);<br />
}<br />

when I call the function first time, i got no proglem.. but when i calll next time, I got run time error.... why is that?

Lakitu20-Aug-02 4:55

20-Aug-02 4:55

The code makes sense to me, the only reason for failure I can make out is the strptr variable. fprintf may fail horribly if strptr is NULL or pointing to some weird memory location...

Look! They have the Internet on computers now! (Homer J. Simpson)

pnpfriend20-Aug-02 5:17

20-Aug-02 5:17

strptr is not NULL..
strptr get set to some string... right before that function got called.. strptr was fine... even i put some string fori know, that is like "hello" i
oh.. would it be because the function is in different program???
I have two dos-based applications.. but the both have the same function...writefile()....
so please also so tell me...

Michael P Butler20-Aug-02 5:17

Michael P Butler

20-Aug-02 5:17

What is strptr declared as?

Michael Smile | :)

Time flies like an arrow. Fruit flies like a banana

Mike Nordell20-Aug-02 5:31

Mike Nordell

20-Aug-02 5:31

Win wrote:
when I call the function first time, i got no proglem.. but when i calll next time, I got run time error.... why is that?

Does the file even open the second time (i.e. does "stream" really get assigned to a real FILE*)?

pnpfriend20-Aug-02 5:59

20-Aug-02 5:59

Does the file even open the second time (i.e. does "stream" really get assigned to a real FILE*)?

that's i don't know.. I'm calling from the different program.
I have program 1 and program two.
they both have the function that does the same job. i named it writefile(). program1 call the function within itself first.. then program2 call it later within itself..
eventhoguh both writefile() in both program1 and program2 do the same job, act the same, have the same name, but they are in different program so they are different. oh.. the error message is saying expression : str!=NULL

<br />
class program1<br />
{<br />
.<br />
.<br />
.<br />
void writefile();<br />
.<br />
.<br />
<br />
};<br />
<br />
<br />
class program2<br />
{<br />
.<br />
.<br />
.<br />
void writefile();<br />
.<br />
.<br />
<br />
};<br />

pnpfriend20-Aug-02 7:04

Reading the combo box edit portion

20-Aug-02 7:04

my bad.. coz of typo.. couldn't open the file..
thanks guys

Shay Harel20-Aug-02 4:46

Shay Harel

20-Aug-02 4:46

Hi !

I added a combo box to a toolbar in my FrameWnd. I can add items and everything but I miss 2 things:

1) If I manually type somwthing in the edit box of the combo box, and press enter, I cant find a handler to detect it.

2) how can I read the string value of waht I just entered ?

In a dialog it was much easier I did UpdateData and I was all set....

Thank you
Cry | :((

Lakitu20-Aug-02 5:09

20-Aug-02 5:09

1) You could use the ON_CBN_SELENDOK notification.
2) just use GetWindowText()

Look! They have the Internet on computers now! (Homer J. Simpson)

Shay Harel20-Aug-02 5:17

Shay Harel

20-Aug-02 5:17

The second one worked great, I wasted the whole morning on that.

The first one I already tried and I have it in my message map, the funny thing is that it will not trigger from some reason, is there anything I have to do when I create the combobox so it will sense the ENTER ?

Thanks !!!

Shay

Lakitu20-Aug-02 5:30

20-Aug-02 5:30

The edit control portion of a combo box usually does not receive ENTER notifications since all edit controls do not support this behaviour. ENTER usually means "default button pressed", as in dialogs.
What is the parent window of the combo box? Is it a CFrameWnd? You could also search CP for some of those special toolbars that contain combo boxes to get a hint...

good luck Roll eyes | :rolleyes:

Look! They have the Internet on computers now! (Homer J. Simpson)

Shay Harel20-Aug-02 5:40

Shay Harel

20-Aug-02 5:40

yes, the parent is a FrameWnd, I will look in CP for demoes.

Thank you

time woes

Lakitu20-Aug-02 4:12

20-Aug-02 4:12

I have to work with time functions. Time and date values have to be stored in string representation and have to be in UTC. Format is yyyymmddhhmmss. Now I use time() to get the current time and gmtime() to break it down into single values for formatting. When converting the string back into a struct tm I cannot use mktime() because that function takes the time zone into account, i.e. the resulting time value is not the same as before. I know that localtime() and mktime() are counterparts, is there any counterpart for gmtime()?

Look! They have the Internet on computers now! (Homer J. Simpson)

Re: time woes

Ravi Bhavnani20-Aug-02 4:44

Ravi Bhavnani

20-Aug-02 4:44

If you're using MFC, I would use CTime or COleDateTime instead.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: time woes

Lakitu20-Aug-02 4:49

How to use Complex Template Class function?

20-Aug-02 4:49

Unfortunately I have to use plain C/C++ for portability reasons...

Look! They have the Internet on computers now! (Homer J. Simpson)

Re: time woes

Ravi Bhavnani20-Aug-02 5:36

Ravi Bhavnani

20-Aug-02 5:36

I think you can use _ftime() to get the current timezone.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

oRion20-Aug-02 3:51

oRion

20-Aug-02 3:51

I have come across this function in the <complex> class template.

template<class t="">
complex<t> conjg(const complex<t>& x);

how do I access this function?

Cry | :((

HTML Editor

Mr_CounterStrike20-Aug-02 3:49

Mr_CounterStrike

20-Aug-02 3:49

Hi,

I'm working on a HTML Editor. I've been learning C++ only 2 weeks ago.

I'm making a MFC Application, Dialog-Based.

I use a multiline EditBox to store the HTML code.

I want to add HTML tags (like
, which is a new line, for those who don't know HTML) in my EditBox when a user clicks on a menu link.

I want the tag to be displayed where my cursor is, in my editbox, but all I was able to do was to store the current text of the EditBox in a variable, then set the editbox's text and add the variable which contains the tag.

CString text;
CString br = "
";
m_htmlEdit.GetWindowText(text);
m_htmlEdit.SetWindowText(text + br);

So I suppose you know what happens... the text is displayed at the end of my EditBox Frown | :(

Please help me!

Thanks a lot!! Smile | :)

Tomasz Sowinski20-Aug-02 3:54

Tomasz Sowinski

20-Aug-02 3:54

Use CEdit::ReplaceSel method.

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

Mr_CounterStrike20-Aug-02 4:01

Mr_CounterStrike

20-Aug-02 4:01

How does that function work?

Can you give me an example please?

Thanks a lot!
Smile | :)

Tomasz Sowinski20-Aug-02 4:01

Tomasz Sowinski

20-Aug-02 4:01

Using VC help is too difficult?

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

Mr_CounterStrike20-Aug-02 4:05

Mr_CounterStrike

20-Aug-02 4:05

Sorry but I don't have the MSDN CD so I couldn't install the help.

That's why I'm asking you if you can give me an example.

Thank you.