CODEWITHSUNDEEP
carraysfilepointers
N.W.A
N.W.A

Reputation: 75

Read from .txt File and store specific lines in strings

I have a text document looking like this:

#Something
info1
#Something
info2
#Something
info3

Now I want to read this file and skip all lines starting with # and store the normal strings in a char array.

I tried this:

void ReadFromFile()
{
    char *info1;
    char *info2;
    char *info3;
    char str[200];
    int line1;
    FILE *fp;
    fp = fopen("game:\\Config.txt", "r");
    if(!fp)
        return;
    while(fgets(str,sizeof(str),fp) != NULL)
    {
        line1++;
        int len = strlen(str)-1;
        if(str[len] == '\n')
            str[len] = 0;
        printf("%i", line1);
        if(line1 == 2)
        {
            printf("%s", str);
            info1 = str;
        }
        if(line1 == 4)
        {
            printf("%s", str);
            info2 = str;
        }
        if(line1 == 6)
        {
            printf("%s", str);
            info3 = str;
        }
        printf("\n");
    }
    fclose(fp);
    printf("\n");
    printf("%s\n", info1);
    printf("%s\n", info2);
    printf("%s\n", info3);
}

When I run this I get the output:

1
2info1
3
4info2
5
6info3

info3
info3
info3

Any idea why this is not working? I want the output to be:

1
2info1
3
4info2
5
6info3

info1
info2
info3

Upvotes: 1

Views: 77

Answers (1)

LogicStuff
LogicStuff

Reputation: 19627

All these pointers:

char *info1;
char *info2;
char *info3;

point to the same buffer (each write through these pointers will overwrite the previous contents):

char str[200];

You'll have to make three separate buffers:

char str1[200];
char str2[200];
char str3[200];

Or:

char str[3][200];

while(int i = 0; fgets(str[i], sizeof(*str), fp) != NULL; )
{
    // increment i if line without # was read
}

Or print the lines immediately after reading them (only one buffer required).

Upvotes: 3

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