Thread: how to read string from half way through a file?

hi all

straight to the point, i have set my string breakers e.g.: filenameRfile contentsQ
the R and the Q are my point string breakers

i have got the filename part of my program to create the file under that file name but now i am struggling to copy the file's contents because i do not know how to get it to read only between Q & R

Code:

char *pos2 = strchr(heading, 'Q');
int pos2a = pos2-heading;

i have used this to find out how many characters there are til Q is reached

this then doesnt carry on from R it starts all over again

is there a way to start it from a certain spot?
kind regards

anybody shed some light on this?

What exactly are you trying to do... Can you show us some source code?

Code:

R_p = strchr(heading,'R');
Q_p = strchr(heading,'Q');
// check for NULL
n = Q_p - R_p;

Originally Posted by Bayint Naung

Code:

R_p = strchr(heading,'R');
Q_p = strchr(heading,'Q');
// check for NULL
n = Q_p - R_p;

what do you actually mean by check for null?

i mean after the file name there is no null its just: filenameRfile contents\0Q

i need to find R and minus the first part out of my buffer

What he's saying is that if R or Q do not exist, strchr will return null.

Also, if R_p is above, then R_p+1 is your string that you so desperately want.

Do you care about keeping the original string intact?

Code:

char *pos = strchr(heading, 'R');
pos++;
char *pos2 = strchr(heading, 'Q');
*pos2 = 0;

If you need to keep the string intact, then don't do the last line. pos is still your string.
pos is exactly what you want.