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please help reading a file

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kot1990
Expert Cheater

Reputation: 1

Joined: 06 Sep 2009
Posts: 131
Location: Greece

Posted: Fri Apr 23, 2010 7:53 am Post subject: please help reading a file

I have a file that has data in it like this

Code:

1 1 172 blabal blabla
1 1 173 blabal blabla 500
1 1 174 450 10 blabla

I need only the third value of each line, 172,173,174.
I tried the following:

Code:

FILE* myfile = fopen("C:\\myfile","r");
fprintf(myfile," "); //2 spaces to skip the first 2 values.
fscanf(myfile,"%s",consoleBuffer);
fprintf(myfile,"\n"); <-- this one doesn't work.

Note: the file has not the same number of elements in each line.

EDIT: Solved

Code:

char fileLine[500];
int ID;
FILE* myfile = fopen("C:\\myfile","r");
for(int i=0;i<10;i++)
{
   fgets(fileLine,500,myfile);
   sscanf(fileLine,"%*s %*s %d",ID);
sprintf(consoleBuffer,"%d\n",ID);

   WriteConsole(consoleHandle,consoleBuffer,strlen(consoleBuffer),NULL,NULL);
}

Slugsnack
Grandmaster Cheater Supreme

Reputation: 71

Joined: 24 Jan 2007
Posts: 1857

Posted: Fri Apr 23, 2010 9:53 am Post subject: Re: please help reading a file

kot1990 wrote:

I have a file that has data in it like this

Code:

1 1 172 blabal blabla
1 1 173 blabal blabla 500
1 1 174 450 10 blabla

I need only the third value of each line, 172,173,174.
I tried the following:

Code:

FILE* myfile = fopen("C:\\myfile","r");
fprintf(myfile," "); //2 spaces to skip the first 2 values.
fscanf(myfile,"%s",consoleBuffer);
fprintf(myfile,"\n"); <-- this one doesn't work.

Note: the file has not the same number of elements in each line.

Code:

#include <stdio.h>

int main() {
FILE * pFile;
if( !( pFile = fopen( "C:\\myfile.txt", "r" ) ) ) {
perror( "The following error occured" );
return 1;
}
else {
int num1, num2, num3;
char c;

do {
c = ' ';
int offset = fscanf( pFile, "%d\t%d\t%d", &num1, &num2, &num3 );
printf( "%d\n", num3 );

while( c != 0xa && c != EOF )
c = getc( pFile );
}
while( c != EOF );

fclose( pFile );
}

return 0;
}

I copied and pasted your file and the new line was 0xa. However it could well be something else so that might be something you want to check for. Alternatively, you can read the entire file as a string and use strtok()

kot1990
Expert Cheater

Reputation: 1

Joined: 06 Sep 2009
Posts: 131
Location: Greece

Posted: Fri Apr 23, 2010 10:19 am Post subject:

thx

Flyte
Peanuts!!!!

Reputation: 6

Joined: 19 Apr 2006
Posts: 1887
Location: Canada

Posted: Fri Apr 23, 2010 1:25 pm Post subject:

I'd recommend using fgets() and sscanf() over fscanf().

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