Read from a text file..

[Unregistered]

Compiler - Turbo c++ v4.5 (Borland)
OS - Win Me/98
Well i have created a program to write to a.txt file
here's the part of the codes:

add()
{
	int x;
	ptr=fopen("data.txt","a+");
	for(x=0;x<2;x++)
	{
		printf("\nID: ");
		scanf("%d",&field[x].id);
		printf("\nName: ");
		scanf(" %[^\n]",field[x].name);
		printf("\nQty: ") ;
		scanf("%d",&field[x].qty);
		printf("\nPrice: ") ;
		scanf(" %lf",&field[x].price);

		fprintf(ptr, "%d|", field[x].id);
		fprintf(ptr, "%s|", field[x].name);
		fprintf(ptr, "%d|", field[x].qty);
		fprintf(ptr, "%.2lf\n", field[x].price);
	}
	fclose(ptr);
	return 0;
}

File contents stored like below
ID|toyname|qty|price

Ex.:
001|mickey mouse|12|25.00
002|donald duck|21|23.10
003|abc,..|17|5.00

1) How do i read line by line and display it on the screen without the "|"?
Ex. ID : 001
Toy: mickey mouse
Qty: 12
Price : 25.00

ID : 002
Toy: donald duck
Qty: 21
Price : 23.10

Please provide me a simple program code which can read the data..

[quzah]

Use fscanf.

Quzah.

[Unregistered]

The fscanf will not work correctly on the "mickey mouse" field. It will copy "mickey" into the variable (it stops copying when it reaches a white space character).

Long winded, but try this.


#include "stdio.h"
#include "stdlib.h"
#include "string.h"

static void ParseFunction(char *FileBuf, int *int1, char *str1, int *int2, float *float1);
static void CopyStrField(char *FileBuf, char *str1, int *x);
static void CopyIntField(char *FileBuf, int *int1, int *x);
static void CopyFloatField(char *FileBuf, float *float1, int *x);

#define PARSE_CHAR '|'

int main(int argc, char* argv[])
{
char FileBuf[31];
int int1;
int int2;
char str1[31];
float float1;

/* fill FileBuf with some test data */
strcpy(FileBuf, "001|mickey mouse|12|25.00");

/* this function will parse the individual fields */
ParseFunction(FileBuf, &int1, str1, &int2, &float1);

/* display the results */
printf("int1: (%03d)\n", int1);
printf("str1: (%s)\n", str1);
printf("int2: (%d)\n", int2);
printf("float1: (%1.2f)\n", float1);

return 0;
}

static void
ParseFunction(char *FileBuf, int *int1, char *str1, int *int2, float *float1)
{
/* if you need to parse more fields, change this value
pass more variables in */
#define FIELD_COUNT 4
//sscanf(FileBuf, "%d|%s|%d|%f", int1, str1, int2, float1);
int i;
int x = 0;

for (i = 1 ; i <= FIELD_COUNT ; i++)
{
switch (i)
{
case 1:
CopyIntField(FileBuf, int1, &x);
break;

case 2:
CopyStrField(FileBuf, str1, &x);
break;

case 3:
CopyIntField(FileBuf, int2, &x);
break;

case 4:
CopyFloatField(FileBuf, float1, &x);
break;

default:
printf("Invalid field number\n");
break;
}
}
}

static void
CopyStrField(char *FileBuf, char *str1, int *x)
{
int i = 0;

while (FileBuf[*x] != '\0' && FileBuf[*x] != PARSE_CHAR)
{
str1[i] = FileBuf[*x];
(*x)++;
i++;
}
(*x)++;

str1[i] = '\0';
}

static void
CopyIntField(char *FileBuf, int *int1, int *x)
{
int i = 0;
char TmpStr[10];

while (FileBuf[*x] != '\0' && FileBuf[*x] != PARSE_CHAR)
{
TmpStr[i] = FileBuf[*x];
(*x)++;
i++;
}
TmpStr[i] = '\0';

(*x)++;

*int1 = atoi(TmpStr);
}

static void
CopyFloatField(char *FileBuf, float *float1, int *x)
{
int i = 0;
char TmpStr[10];

while (FileBuf[*x] != '\0' && FileBuf[*x] != PARSE_CHAR)
{
TmpStr[i] = FileBuf[*x];
(*x)++;
i++;
}
TmpStr[i] = '\0';

(*x)++;

*float1 = atof(TmpStr);
}

[kwigibo]

I recommend have your data in the text file like

001
Mickey Mouse
12
25
002
etc...

then you can use to read the data like this

fscanf(fptr,"%d\n",&item);
fgets(product, 150, fptr);  //Gets on or more words depending on characters
fscanf("%d\n %f\n",&qty, &price);

Or something similar

[quzah]

The fscanf will not work correctly on the "mickey mouse" field. It will copy "mickey" into the variable (it stops copying when it reaches a white space character).

Yes it will. You just have to know how to use it.

fscanf( fp, "%[^|]", mybuffer );

Quzah.

[Unregistered]

thanks! for the code anonymous!

kwigibo: i also want to use that way but the instruction given is like that..

btw quzah if i use fscanf .. what while condition should i use?

how to make it read line by line till the end of file?
could u provide a sample code...

[quzah]

Line by line? fgets will read whole lines.

For a record like this:

001|mickey mouse|12|25.00

fscanf( fp, "%d|%[^|]%d|%f", &number, buffer, &number2, &floatynumber );

I believe that's correct.

Quzah.

[Unregistered]

1) quzah it seems that it does't work after the name

	struct details temp;
	fscanf( ptr, "%d|%[^|]%d|%f", &temp.id, temp.name, &temp.qty,
		&temp.price);
	printf("%d\n", temp.id);
	printf("%s\n", temp.name);
	printf("%d\n", temp.qty);
	printf("%.2f\n", temp.price);

it prints out the id and the name correctly but the rest not..

this is the content inside txt
1|1 tg|1|1.00

result:
1
1 tg
8823
0.00


2) is this while loop works? If i wanto read all the contents of txt n print it all out on screen

while (!feof(ptr))
{
    fscanf(......
    printf("%d", temp.id);
};

[quzah]

Replace this:

fscanf( fp, "%d|%[^|]%d|%f", &number, buffer, &number2, &floatynumber );

With this:

fscanf( fp, "%d|%[^|]|%d|%f", &number, buffer, &number2, &floatynumber );

Works like a champ.

Quzah.

[Unregistered]

yes! it works greaT!

thanks quzah!

[Unregistered]

Hi! again!

add()
{
	int x;
	ptr=fopen("data.txt","a+");
	for(x=0;x<2;x++)
	{
		printf("\nID: ");
		scanf("%d",&field[x].id);
		printf("\nName: ");
                                //Here's the code changed..
                                fgets(field[x].name, 25,stdin );
                                fflush(stdin);
                       //      scanf(" %[^\n]",field[x].name);
		printf("\nQty: ") ;
		scanf("%d",&field[x].qty);
		printf("\nPrice: ") ;
		scanf(" %lf",&field[x].price);

		fprintf(ptr, "%d|", field[x].id);
		fprintf(ptr, "%s|", field[x].name);
		fprintf(ptr, "%d|", field[x].qty);
		fprintf(ptr, "%.2lf\n", field[x].price);
	}
	fclose(ptr);
	return 0;
}

I just changed my code for the Name Input.. i want it to only accept 25 chars only.

the prob is when it stored into text file :

ex:

1|mickey
mouse|12|25.00
2|donald
duck|21|23.10