Thread: Problem reading from a file..

i have a function that is going to read from a file, first look for the specific check number the user is trying to see, then print it to the screen, i got it to work by just taking all the data, until "-" shows up, the break point between each record, but i need to divide everyline into a variable so i can put everything very fancy , the only problem is that im not pretty good a C, and i've try many things, gone thru several forums, i don't have a book, and i need to turn this in soon.

thanks in advance, here goes the function;

Code:

void mostrarcheque()
{
    system ("cls");
    printf("\n%-27cImpresion de Cheques\n\r");
    printf("\n%-28cMostrar Cheques\n\r");
    FILE *file;    
    file = fopen("cheques.txt", "r"); 
    struct cheque micheque;
    char buffer[255];
    char buffer_numerocheque[3];
    int key = 0;
    printf("\n%-7cBuscar por: \n\r"); 
    printf("\n%-7cEscriba el Cheque : ");
    fgets (buffer_numerocheque,255,stdin);
    if(file==NULL) 
    {
        printf("Error: No se pudo abrir el archivo.\n");
    }
    else
    {
        while(fgets(buffer, 255, file)!= NULL) 
        { 
                if ( strcmp (buffer, buffer_numerocheque) == 0 )
                {
                     printf("\n********************************************************************************\n\n\r");
                     printf("\n%-60cCheque No.");
                     do
                     {
                     buffer==micheque.numerodecheque;                      
                     printf("%i\n", micheque.numerodecheque);
                     fgets(buffer, 255, file);
                     buffer==micheque.destinatario;
                     fgets(buffer, 255, file);
                     buffer==micheque.fecha;
                     fgets(buffer, 255, file);
                     buffer==micheque.nocuenta;
                     fgets(buffer, 255, file);
                     buffer==micheque.banco;
                     fgets(buffer, 255, file);
                     buffer==micheque.monto;
                     } while ( buffer[0] != '-' );
                     break;
                }
        }
    }

    printf("\n\n%-50c____________________________ \n\r");
    printf("\n%-60cFirma \n\r");    
    printf("\n********************************************************************************\n\n\r");
    continuar(); 
}

>but i need to divide everyline into a variable so i can put everything very fancy
what do u mean how to get each fields from the line read from the file. u might well use sscanf or strtok. but i recommand u not to use strtok it changes the original string. better use sscanf

NOTE: is your code u are not checking the return value of fgets. u must check that.

ssharish2005

Okey i got improvement

few problems:

1st. i goes thru the do-while again and then it wud show again every field with - and then stop.
2nd. sscanf doesnt takes spaces? for example on the name i had "Erick Valverde" it just takes "Erick"

Code:

void mostrarcheque()
{
    system ("cls");
    printf("\n%-27cImpresion de Cheques\n\r");
    printf("\n%-28cMostrar Cheques\n\r");
    FILE *file;    
    file = fopen("cheques.txt", "r"); 
    struct cheque micheque;
    char buffer[100];
    char buffer_numerocheque[3];
    int key = 0;
    printf("\n%-7cBuscar por: \n\r"); 
    printf("\n%-7cEscriba el Cheque : ");
    fgets (buffer_numerocheque,255,stdin);
    if(file==NULL) 
    {
        printf("Error: No se pudo abrir el archivo.\n");
    }
    else
    {
        while(fgets(buffer, 255, file)!= NULL) 
        { 
                if ( strcmp (buffer, buffer_numerocheque) == 0 )
                {
                     printf("\n********************************************************************************\n\n\r");
                     printf("%-60cCheque No.");
                     do
                     {
                                           
                     sscanf(buffer, "%s", micheque.numerodecheque);         
                     printf("%s\n", micheque.numerodecheque);
                     fgets(buffer, 255, file);
                     sscanf(buffer, "%s ", micheque.destinatario);         
                     printf("Paguese a : %s\n", micheque.destinatario);
                     fgets(buffer, 255, file);
                     sscanf(buffer, "%s ", micheque.fecha);         
                     printf("Fecha : %s\n", micheque.fecha);
                     fgets(buffer, 255, file);
                     sscanf(buffer, "%s ", micheque.nocuenta);         
                     printf("Numero de Cuenta : %s\n", micheque.nocuenta);
                     fgets(buffer, 255, file);
                     sscanf(buffer, "%s ", micheque.banco);         
                     printf("Banco : %s\n", micheque.banco);
                     fgets(buffer, 255, file);
                     sscanf(buffer, "%s ", micheque.monto);         
                     printf("Monto Total : %s\n", micheque.monto);
                     buffer=="-";
                     } while ( buffer[0] != '-' );
                     break;
                }
        }
    }

    printf("\n\n%-50c____________________________ \n\r");
    printf("\n%-60cFirma \n\r");    
    printf("\n********************************************************************************\n\n\r");
    continuar(); 
}

okey, i got my wait out of the do-while by using

Code:

buffer[0]='-';

so 1st problem solved. any help on the second?