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How to use C to modify the content (in the middle) of a f

  • leoson
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Post July 23rd, 2004, 11:14 pm

Suppose I have a file with these content:

... other content...
Counter:1
......other tcontent...

How to read the text file and get the number (1) in the Counter and then change it, and save it to the original file?

The 'Counter' line number is fixed.
then the number is key in from the user

please help!!!

Thanks you in advance.
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Post July 23rd, 2004, 11:14 pm

  • GT500Shlby
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Post July 29th, 2004, 7:12 am

File Stream, while loop
while (blah != "Counter:")
edit, keep going.


;-)
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  • dr_geek
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Post July 30th, 2004, 5:49 am

in C:
Code: [ Select ]
blah != "Counter"
compares pointers, not strings!

You need
Code: [ Select ]
#include <string.h>

...

//loop over all lines in file
 //read blah from file

 if (strcnmp(blah,"Counter:",8) == 0) {
   //modify blah
 }

 //write blah to file
  1. #include <string.h>
  3. ...
  5. //loop over all lines in file
  6.  //read blah from file
  8.  if (strcnmp(blah,"Counter:",8) == 0) {
  9.    //modify blah
  10.  }
  12.  //write blah to file
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Post July 30th, 2004, 6:05 am

My mindset was where !=, ==, =, <, >, etc are overloaded for the string class. I guess that would be more C++esque.
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