Parse A Part of String

This is a discussion on Parse A Part of String within the C Programming forums, part of the General Programming Boards category; Hello Guys... i'm very new to C Programming, but i'm learning quite well... how can i parse only a part ...

  1. #1
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    Post 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

  2. #2
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    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.

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

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    HOPE YOU UNDERSTAND.......

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  5. #5
    msh
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    Quote Originally Posted by Ali.B View Post
    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

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    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()?

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    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);

  8. #8
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    there is much easyer way
    if str="123456"
    sscanf(str,"%3d",&num);

    num will be 123

  9. #9
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    Thanks a million Scarlet7, now I understand how to use it

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