Drawing currency symbol

Question

How to draw a currency symbol in a custom label using CGContextShowTextAtPoint method in draw rect. Here the symbol is in string format.

Any help!! Thanks

Answer 1

I don't really get what you're asking, checking the documentation, the method would look something like that:

 CGContextRef ctx = UIGraphicsGetCurrentContext(); 
 const char *string = "$";
 CGContextShowTextAtPoint (ctx, 160, 240, string, 1);

Haven't tested it, but this should draw $ in the center of the screen.
BTW, why not use images?

~ Natanavra.

Answer 2

You have to resort to C style strings, since this is what CGContextShowTextAtPoint() requires. In order to correctly handle the locale (the currency symbol changes with the locale) you must use setlocale(), then you format your string using strfmon() and finally you pass the string created with strfmon() to CGContextShowTextAtPoint().

Documentation is available as follows from the terminal:

man 3 setlocale
man 3 strfmon

EDIT/UPDATE: For your information, strfmon() internally uses struct lconv. The structure can be retrieved with the function localeconv(). See man 3 localeconv for a detailed description of the fields available in the structure.

for instance, try the following simple C program setting different locales

#include <stdio.h>
#include <locale.h>
#include <monetary.h>

int main(void)
{
    char buf[BUFSIZ];
    double val = 1234.567;

    /* use your current locale */
    setlocale(LC_ALL, ""); 

    /* uncomment the next line and try this to use italian locale */
    /* setlocale(LC_ALL, "it_IT"); */ 
    strfmon(buf, sizeof buf, "You owe me %n (%i)\n", val, val);

    fputs(buf, stdout);
    return 0;
}

The following uses localeconv():

#include <stdio.h>
#include <limits.h>
#include <locale.h>

int main(void)
{
    struct lconv l;
    int i;

    setlocale(LC_ALL, "");
    l = *localeconv();

    printf("decimal_point = [%s]\n", l.decimal_point);
    printf("thousands_sep = [%s]\n", l.thousands_sep);

    for (i = 0; l.grouping[i] != 0 && l.grouping[i] != CHAR_MAX; i++)
        printf("grouping[%d] = [%d]\n", i, l.grouping[i]);

    printf("int_curr_symbol = [%s]\n", l.int_curr_symbol);
    printf("currency_symbol = [%s]\n", l.currency_symbol);
    printf("mon_decimal_point = [%s]\n", l.mon_decimal_point);
    printf("mon_thousands_sep = [%s]\n", l.mon_thousands_sep);
    printf("positive_sign = [%s]\n", l.positive_sign);
    printf("negative_sign = [%s]\n", l.negative_sign);
}