Parse A Part of String

Ali.B · 08-06-2009, 05:07 PM

Hello Guys...
i'm very new to C Programming, but i'm learning quite well...
how can i parse only a part of a string?
my string is always like this:

Code:

GET /send.htm?Text=START HTTP/1.1

only the "START" part can change according to user input, but that part is always after the "=" sign and before " " (the space) before HTTP.
i need to retrieve that part only and save into an variable. how can i do this?
i would appreciate it if some one could help me with this, an example code or something would be really nice.

thanking you in advance

bithub · 08-06-2009, 05:21 PM

Use strchr() to get the location of the '='. Then use strchr() again to get the location of the space after the equals sign. Finally use strncpy() to copy out the characters between those 2 locations.

Ali.B · 08-07-2009, 06:12 AM

can u give an example? I've never worked with those functions.... or a link that provides some examples.

thanks

BEN10 · 08-07-2009, 06:28 AM

Here

msh · 08-07-2009, 06:28 AM

Quote:

Originally Posted by Ali.B

can u give an example? I've never worked with those functions.... or a link that provides some examples.

thanks

cstring (string.h) - C++ Reference

Ali.B · 08-07-2009, 01:42 PM

I looked at those examples, but I'm still lost... can someone post a piece of code that could demonstrate the use of strchr() and strncpy()?

Scarlet7 · 08-07-2009, 02:17 PM

Code:

	char Text[80] = {0};
	char * line = "GET /send.htm?Text=START HTTP/1.1";

	char *s,*t;

	if(s = strchr(line, '=')) 
	{
		if(t = strchr(s, ' '))
			strncpy(Text, s+1, t-s);
	}
	printf("Text = %s\n", Text);

kakaroto · 08-07-2009, 02:41 PM

there is much easyer way
if str="123456"
sscanf(str,"%3d",&num);

num will be 123

Ali.B · 08-07-2009, 03:07 PM

Thanks a million Scarlet7, now I understand how to use it

08-06-2009, 05:07 PM	#1
Ali.B Registered User Join Date: Jan 2009 Posts: 37	Parse A Part of String Hello Guys... i'm very new to C Programming, but i'm learning quite well... how can i parse only a part of a string? my string is always like this: Code: GET /send.htm?Text=START HTTP/1.1 only the "START" part can change according to user input, but that part is always after the "=" sign and before " " (the space) before HTTP. i need to retrieve that part only and save into an variable. how can i do this? i would appreciate it if some one could help me with this, an example code or something would be really nice. thanking you in advance
Ali.B is offline

08-06-2009, 05:21 PM	#2
bithub Registered User Join Date: Sep 2004 Location: California Posts: 2,845	Use strchr() to get the location of the '='. Then use strchr() again to get the location of the space after the equals sign. Finally use strncpy() to copy out the characters between those 2 locations. __________________ bit∙hub [bit-huhb] n. A source and destination for information.
bithub is offline

08-07-2009, 06:12 AM	#3
Ali.B Registered User Join Date: Jan 2009 Posts: 37	can u give an example? I've never worked with those functions.... or a link that provides some examples. thanks
Ali.B is offline

08-07-2009, 06:28 AM	#4
BEN10 DESTINY Join Date: Jul 2008 Location: in front of my computer Posts: 656	Here __________________ HOPE YOU UNDERSTAND....... for( ; ; ) printf("If you can't make it good, at least make it look good"); PC specifications- 512MB RAM, Windows XP sp3, 2.79 GHz pentium D. IDE- Microsoft Visual Studio 2008 Express Edition
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08-07-2009, 01:42 PM	#6
Ali.B Registered User Join Date: Jan 2009 Posts: 37	I looked at those examples, but I'm still lost... can someone post a piece of code that could demonstrate the use of strchr() and strncpy()?
Ali.B is offline

08-07-2009, 02:17 PM	#7
Scarlet7 Registered User Join Date: Mar 2003 Posts: 169	Code: char Text[80] = {0}; char * line = "GET /send.htm?Text=START HTTP/1.1"; char s,t; if(s = strchr(line, '=')) { if(t = strchr(s, ' ')) strncpy(Text, s+1, t-s); } printf("Text = %s\n", Text);
Scarlet7 is offline

08-07-2009, 02:41 PM	#8
kakaroto Banned Join Date: Aug 2009 Posts: 43	there is much easyer way if str="123456" sscanf(str,"%3d",&num); num will be 123
kakaroto is offline

08-07-2009, 03:07 PM	#9
Ali.B Registered User Join Date: Jan 2009 Posts: 37	Thanks a million Scarlet7, now I understand how to use it
Ali.B is offline

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