sorting this out.

[gstar]

Hi need a hand with my code as I can get it to sort but it wont sort the right field.

I need it to sort by part_number but only can get it to do customer_number , any ideas would be greatly appreciated to show me where Im going wrong.

Thanks
gstar.

//Defines the entry point for the console application.
//

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>

int GetCustomer(FIL E *file,int *number);
int get_field(FILE *file, char delimiter, char *ptr); //This function gets a text field in a 3D matrix
int get_field_float (FILE *file,char delimiter,float *cost);
int compare(const void *a,const void *b);

int _tmain(int argc, _TCHAR* argv[])
{
FILE *file, *output; //two file streams




struct sales
{
int cust_num;
char item[50];
char part_number[15];
float cost;
char date[6];
};

sales mysales[200];





file=fopen("sal es.csv", "r");

//check if file opened
if(file == NULL)
{
printf("can't open file");
return 0;
}

int i=0, j=0;




while (!feof(file))
{


GetCustomer(fil e, &mysales[i].cust_num); //%i
get_field(file, ',',mysales[i].item); //%s
get_field(file, ',',mysales[i].part_number); //%s
get_field_float (file,',', &mysales[i].cost); //%f
get_field(file, ',',mysales[i].date); //%s


i++;
}



qsort(mysales, 196, sizeof(sales), compare); //sort string by sales

printf("\n\n");
for (i=0; i<196; i++)
{
printf("%i;%s;% s;%f;%s \n", mysales[i].cust_num, mysales[i].item, mysales[i].part_number, mysales[i].cost, mysales[i].date);
}





fclose(file);

//***********Outp ut to a file

output = fopen("sorted_s ales.txt", "w+");
fwrite(mysales, sizeof(sales), 196, output);

return 0;
}








// *************** *************** *************** *************** ***********
//
// Functions
//
// *************** *************** *************** *************** ***********
//
// >> This function picks out fields in a delimited file.
// >> You can choose the delimiter to look for.
// >> The function returns the length of the string or -1 for error or EOF
// >>

int GetCustomer(FIL E *file, int *number)
{
int i;
char buffer[80];

// read in customer number
for(i=0;i<=2;i+ +)
{
buffer[i] = fgetc(file);
}

buffer[i] = '\0';

*number = atoi(buffer);

return 0;
}

int get_field(FILE *file, char delimiter, char *ptr)
{
int length=0;
char temp;
while(1)
{
temp=fgetc(file );
if (temp==EOF) return -1;
if((temp==delim iter)||(temp==0 x0A))
{
ptr[length]='\0';
return length;
}
if(temp>0x1F)
{
ptr[length]=temp;
length++;
}
}
return -1;
}

int get_field_float (FILE *file, char delimiter, float *number)
{
char dummy;
int length=0;
char temp[50];

while(1)
{
dummy=fgetc(fil e);
if (dummy==EOF) return -1;
if((dummy==deli miter)||(dummy= =0x0A))
{
temp[length]='\0';
*number=float(a tof(temp));
return length;
}
if(dummy>0x1F)
{
temp[length]=dummy;
length++;
}
}
return -1;
}


/// this function is used by qsort. It has a void pointer entry which is retyped
// inside the function. It is also de-referenced to get at the contents
int compare(const void *a,const void *b)
{
char i= *(int *)a; // this both retypes and dereferences the void pointer
char j= *(int *)b;

if (i==j) return 0;
if (i<j) return -1;
if (i>j) return +1;
}

[zahidkhan]

use this compare function
int compare(const void *a,const void *b)
{
struct sales *psales1= (struct sales *)a;
struct sales *psales2= (struct sales *)b;
return strcmp(psales1->part_number,ps ales2->part_number) ;
}

[zahidkhan]

Hi ,

You have declared the struct sales within the scope of main
and this structure is not visible to compare function

Declare the structure before main and include string.h it will work fine.