C / C++ / MFC Discussion Boards

thathvamsi2-Oct-06 17:52

2-Oct-06 17:52

Hi all,
This is a basic C programming question.
I need to save group of data in to a file with the datas separated by commas.
But, if the datas have commas within themselves, I need to strip that comma and save the data as one single word without commas. But each data item needs to be separated by commas.
Can anyone tell me how to escape or strip the comma if it is within the datafield.

eg., 1, Steve,Dave, 25yrs, California
I want to strip or ignore the comma that is between Steve and Dave and store the data as
1, SteveDave, 25yrs, California

I know this is a basic question. But i need help in this guys.
Many thanks in advance.

Re: strip characters

Link20062-Oct-06 18:07

Link2006

2-Oct-06 18:07

thathvamsi wrote:
eg., 1, Steve,Dave, 25yrs, California
I want to strip or ignore the comma that is between Steve and Dave and store the data as
1, SteveDave, 25yrs, California

Easy, just read it character by character in a simple for loop, if it's comma, ignore it.

Wink | ;)

Re: strip characters

thathvamsi2-Oct-06 18:20

thathvamsi

2-Oct-06 18:20

how to ignore it?
how can i print the data without comma?

Re: strip characters

Link20062-Oct-06 18:26

Link2006

2-Oct-06 18:26

Wait I re-read your question, I misunderstood. I got your question this time.

thathvamsi wrote:
eg., 1, Steve,Dave, 25yrs, California
I want to strip or ignore the comma that is between Steve and Dave and store the data as
1, SteveDave, 25yrs, California

You can see if the next character is space, if not, then it's in the datafield.

Re: strip characters

thathvamsi2-Oct-06 18:30

thathvamsi

2-Oct-06 18:30

I dont understand. sorry.
I have a group of data fields. each data field is separated by comma but the data itself shouldnt have a comma in it. ie., for eg., St,eve, David, Ross

I want to print just Steve, David, Ross by ignoring only that comma that is between 't' and 'e' . i need the other commas to separate the datafields.
how do i do it?
if u can showe some code snippet, thats great.

Re: strip characters

Link20062-Oct-06 18:56

Link2006

2-Oct-06 18:56

thathvamsi wrote:
I have a group of data fields. each data field is separated by comma but the data itself shouldnt have a comma in it. ie., for eg., St,eve, David, Ross

Okay, suppose you have a txt file called data.txt, where the content: St,eve, David

The following code will print Steve David

modify the code a bit yourself to add comma in the end result. Hope that helps.

<br />
#include < stdio.h ><br />
<br />
int main(int argc, char *argv[])<br />
{<br />
        FILE *fp = NULL;<br />
	char buffer[20] = { 0 };<br />
	char ch = 0;<br />
	int i = 0;<br />
<br />
	fp = fopen("data.txt", "r");<br />
	<br />
	for (i = 0; (i < 20) && ((ch = getc(fp)) != EOF) && (ch != '\n'); i++)<br />
	{<br />
		if (ch != ',')<br />
			buffer[i] = (char) ch;<br />
		else<br />
			i--;<br />
	}<br />
<br />
	buffer[i] = '\0';<br />
	printf( "%s\n", buffer);<br />
<br />
	fclose(fp);<br />
<br />
        return 0;<br />
<br />
}<br />

Re: strip characters

thathvamsi2-Oct-06 20:31

thathvamsi

2-Oct-06 20:31

thanks.
how do i do it if the contents are stored in an array of counted byte strings instead of a file.

eg., row[0]=Steve
row[1] =david
row[3] = ross

Re: strip characters

David Crow3-Oct-06 5:32

David Crow

3-Oct-06 5:32

The requirement was to save to a file, not read from it.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

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

Re: strip characters

Hamid_RT2-Oct-06 18:08

Hamid_RT

2-Oct-06 18:08

Hope I understood your question
if you want to delete comma of you can use CString::Find for get commas and then remove their of your string with CString::Delete.

WhiteSky

Re: strip characters

Link20062-Oct-06 18:20

Link2006

2-Oct-06 18:20

WhiteSky wrote:
Hope I understood your question

I think he is asking how to parse a file that contains comma and want to ignore them when parsing.

Re: strip characters

thathvamsi2-Oct-06 18:20

thathvamsi

2-Oct-06 18:20

I want it in C programming

Re: strip characters

David Crow3-Oct-06 5:33

David Crow

3-Oct-06 5:33

WhiteSky wrote:
if you want to delete comma of you can use CString::Find...

This is a C question, not C++/MFC.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

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

Re: strip characters

ThatsAlok2-Oct-06 20:19

ThatsAlok

2-Oct-06 20:19

thathvamsi wrote:

I want it in C programming

you have to implement logic for same!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: strip characters

David Crow3-Oct-06 5:38

David Crow

3-Oct-06 5:38

thathvamsi wrote:
eg., 1, Steve,Dave, 25yrs, California

If the string to be parsed is "1, Steve,Dave, 25yrs, California", there's no way to reliably differentiate between the various commas. Depending on the placement of a space is unreliable.

Now, if you have control over how the aforementioned string is put together, then a solution is very easy.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

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

Read value

yijia_242-Oct-06 17:47

yijia_24

2-Oct-06 17:47

I created a edit box and a "apply" button. when i clicked button, I want it can retrieve the value which i typed in the edit box.following is my code, but why it doesnt work?

void CIPConfig::OnBnClickedButton2() // enable
{
UpdateData(FALSE);
int level;
level = atoi(v_level);//v_level is varibale of edit box.

}

Re: Read value

Hamid_RT2-Oct-06 17:57

Hamid_RT

2-Oct-06 17:57

if you want to read of editbox you can use GetWindowTextor GetDlgItemIntor GetDlgItemText

WhiteSky

Re: Read value

Naveen2-Oct-06 17:57

Naveen

2-Oct-06 17:57

yijia_24 wrote:
UpdateData(FALSE);

use

UpdateData( TRUE );

yijia_24 wrote:
int level;
level = atoi(v_level);//v_level is varibale of edit box.

u can directly create a int varaiable for the edit control. no need of this..

nave

Re: Read value

ThatsAlok2-Oct-06 19:39

ThatsAlok

2-Oct-06 19:39

yijia_24 wrote:
level = atoi(v_level);//v_level is varibale of edit box.

why using atoi function.. you can use DDX_Text directly for integer value

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: Read value

yijia_242-Oct-06 18:45

yijia_24

2-Oct-06 18:45

Thank you very much!
Would you explain to me the difference between UpdateData(FALSE) and UpdateData(TRUE)? I am still very confused about it.

Re: Read value

yijia_242-Oct-06 22:16

yijia_24

2-Oct-06 22:16

Thank you very much!
now i need send this data to a socket, do u know how to do it?
Thank you,
yj

Re: Read value

Naveen2-Oct-06 18:55

Naveen

2-Oct-06 18:55

yijia_24 wrote:
UpdateData(TRUE)?

when u call the UpdateData(TRUE), the values in the control are set to the value variable created for each control.

When u call the UpdateData(FALSE), the values in the variable is set to the correspoding control.

When u call a UpdateData function, it sets/gets all the value to and from all the controls to the variables. some times u may want to take only the text of one edit control. But in that case also all controls in the dialog are upadated. It slows down the program.

U can use the GetDlgItemText() or SetDlgItemText instead of UpdateData()( I recommend this )

nave

Re: Read value

yijia_242-Oct-06 19:02

yijia_24

2-Oct-06 19:02

Thank you very much!
I appreciate you spending time over my questiones. Smile | :)

Re: Read value

S Douglas3-Oct-06 0:09

S Douglas

3-Oct-06 0:09

yijia_24 wrote:
Would you explain to me the difference between UpdateData(FALSE) and UpdateData(TRUE)?

Here is a good article on UpdateData Avoiding UpdateData [^]

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

Re: Read value

David Crow3-Oct-06 5:41

David Crow

3-Oct-06 5:41

yijia_24 wrote:
I am still very confused about it.

Which is why you should avoid it. See here for more.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

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

Re: Read value

David Crow3-Oct-06 5:39

David Crow

3-Oct-06 5:39

Naveen R wrote:
yijia_24 wrote:
UpdateData(FALSE);

use

UpdateData( TRUE );

Another reason why UpdateData() should be avoided.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

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

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