Thread: finding a particular string in a readin file

Hello,

I have a file that I'm reading in.. i.e. :

\version: someexample
\file: somefile
\testsize: sometest
\datapoint: somepoint

when I read it in I need to be able to look at th file and check for a particular thisg: example: I need to be able to check for the string "\testsize: " and then bring in the (integer) sometest and store it in some variable.


I know how to read in a file:

int sometest;

ifstream infile("myfile");

//I am not sure how to check for the string "\testsize: " and
// read in the number that it is assigned...

infile >> sometest;

any help will be greatly appreciated.... thanks

use the getline() command and then compare the string that you retrieved against what your looking for with strncmp()

hello,

I am hoping someone can help me...I'm having quite a bit of problems with this...

I outlined the problem above...but basically I am reading in a file, I'll give a small sample of what the file contains:

/scan size: 123
/scan size2: 1234
/zsize: 90

this list is long and most of the components are of not interest.
so, while reading in...I want to be able to look for string: "/scan size: " or "/zsize: ", and I want to read in the numbers that are listed for those paramenter, i.e: for "/scan size: " I want to store 123, for "/zsize: " I want to store 90, I can't figure out how to do this....this is what I wrote:



void readheader(char *infile){

ifstream input(infile);//this is just the file that I'm getting
char filein[30];
strcpy(filein, infile);

char str[] [20]= { "\Scan Size: ", "\Z sensitivity: ", "\Z max: "};
int n;
float scansize1;


ifstream in(filein);

if (in.is_open()) {

while(in ){
if(strncmp (str[n], "\Scan Size: ", 12) == 0) {

in>>scansize1; //so here it would see "\Scan Size: " and
//should read in the value that's listed beside it...

} } }

//just to check if it did read the right number

cout<<"this is the scansize: "<<scansize1;

in.close();

}//end readheader

I ran this, it complied, but not doing anything...I'm really not sure how to code this and need help.....thanks for any help....