Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 252
  • Last Modified:

getting data out of a CSV file.

I need to pull data from a .CSV file.
I have opened the file using fopen(stream,"r").  How do I get the data that is there? There are 9 collums and unlimitted number of rows with data in them. Once I have the data I need to pass it to multiple CString varibles for viewing. Examples of code would be much appreciated.
PS I can not use ODBC or DAO to accomplish this task.  I am using VC++ 6.0.
0
Argonauts
Asked:
Argonauts
  • 2
1 Solution
 
jclaytonCommented:
OK then, you've opened the file using the old IO library (I presume you don't want to use the new one?).

Here's some simple code that could easily be shunted into a CLASS that handles reading CSV files.  Made a quick look on the msdn.microsoft.com site too - but not much there (only an ODBC solution).

#include <iostream.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#ifndef WIN32
#include <unistd.h>
#include <sys/types.h>
#endif

#define BUFFSIZE 1024

int main(int argc, char *argv[])
{
    // open a file for reading
    FILE *filep = fopen("file.csv", "r");

    if(filep == NULL)
    {
        return 1; // boom
    }

    // load each line into a buffer
    char *buffer = new char[BUFFSIZE]; // assume we've not got lines longer than this?

    if(buffer == NULL)
    {
        delete [] buffer;
        return 2; // oops, no mem?
    }

    int bytesRead = fread(buffer, 1, BUFFSIZE, filep);
    while(bytesRead != 0)
    {
        // process this buffer line into tokens, you should not that this routine will NOT handle
        // embedded quotes within a CSV item - you should write this properly or get it off the net.
        char *tokdelim = ",\t\r\n";
        char *tokptr = strtok(buffer, tokdelim);
        while(tokptr)
        {
            // do something with the token
            printf("'%s'\r\n", tokptr);
            tokptr = strtok(NULL, tokdelim);
        }

        bytesRead = fread(buffer, 1, BUFFSIZE, filep);
    }

      fclose(filep);

    delete [] buffer;
    return 0; // no errors - ok !
}
0
 
jclaytonCommented:
Oops, forgot the next obvious bit.  Presumably you can keep a count (that is reset on each line read) of the column you've just read, and then simply use a case statement to push the data onto the CString values?

Johno.
0
 
ArgonautsAuthor Commented:
That looks to be right.  I appreciate it.  I will give it a try and see what happens.  You also mentioned something about a new style.  If you could just give me a keyword on that I will look it up.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now