Re: [Dev-C++] newbie string parsing question

[Scott S. <age...@co...>]

This is probably the smartest solution. I was going to suggest C 
functions. Also, you can include <cstdio> instead of stdio.h. That will 
include all of the C headers in namespace std.
Per Westermark wrote:

>Note 1: fscanf will not allocate any memory. first_name and last_name must
>already point to large enough memory buffers.
>
>Note 2: that scanf functions are a common road of buffer overflow attacks.
>If one of the names in the string is very long, it will overwrite
>unallocated memory. Whenever strings are loaded, a maximum field width
>should be specified in the formatting string!
>
>One other common method of loading text lines using C, i.e. without use of
>the string data type, is to load each text line with
>  fgets(buf,sizeof(buf),file)
>and then use sscanf() on a sanitized string, or use strchr(), strtok() or
>similar to find the separator character(s) between the tokens.
>
>/Per W
>
>On Tue, 17 Aug 2004, Matt Valerio wrote:
>
>  
>
>>Look up the fscanf() function.
>>
>>pseudo-code:
>>#include <stdio.h>
>>
>>char* first_name;
>>char* last_name;
>>int age;
>>FILE* in_file;
>>infile = fopen("data.txt","r");
>>while ( !eof(infile) ) {
>>	fscanf( infile, "%s\t%s\t%d\r", first_name, last_name, &age);
>>	// do something with the first_name, last_name, and age variables here.
>>}
>>close(infile);
>>
>>
>>I think that's right -- might want to double check all of the pointers
>>and stuff (the * and & operators).  I'm just typing this off the top of
>>my head so double check the syntax.
>>
>>-Matt
>>
>>
>>
>>
>>wor...@so... wrote:
>>
>>    
>>
>>>Hi all,
>>>
>>>Thank you in advance for any help that you can offer.
>>>
>>>I have a text file that has records like this:
>>>
>>>Firstname 	Lastname 	age  //seperated by the \t character.
>>>
>>>I want to run a while loop and parse the record to populate a struct array.
>>>I have looked into the getline(string, max, delimiter) function but it needs char[]'s.
>>>Since I don't know the length of the string that I need can someone recommend
>>>an existing different class function or something?
>>>
>>>Best regards,
>>>
>>>Dane
>>>
>>>
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>
>
>
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