Author Topic: C string with numbers for a label (Read 10793 times)

Munchor · « **on:** October 02, 2011, 07:24:12 am »

I am using GTK+ to create a label with numbers on it:

time_text = gtk_label_new("Time: %i:%i:%i", hours, minutes, seconds);
The gtk_label_new function takes a const gchar *str as argument. However, when compiling the code, I get:

Quote from: GCC

error: too many arguments to function ‘gtk_label_new’

This is because I am passing four arguments to gtk_label_new.

So I need to pass only one string, but I need the numbers included (hours, minutes, seconds).

Any idea? Thanks!

calc84maniac · « **Reply #1 on:** October 02, 2011, 12:26:19 pm »

Try this:

Code: [Select]

// I chose 20 arbitrarily as a maximum buffer size, you can have a lower character limit if you want
char temp_text[20];
// Using %02i instead of %i because you probably want 2 characters padded with 0 on the left
snprintf(temp_text, sizeof(temp_text), "Time: %02i:%02i:%02i", hours, minutes, seconds);
// Now call with one argument like it wants
time_text = gtk_label_new(temp_text);

Munchor · « **Reply #2 on:** October 02, 2011, 12:33:56 pm »

It worked perfectly, I found a way that converts each number to a char*, but using snprintf(); is much cleaner, thanks!

Author Topic: C string with numbers for a label (Read 10793 times)

Munchor

C string with numbers for a label

calc84maniac

Re: C string with numbers for a label

Munchor

Re: C string with numbers for a label