I have some problems with ncurses.
Could someone tell me why it doesn't print anything out?

#include <ncurses.h>

int main()
{
initscr();
cbreak();
noecho();
start_color();

int lines, cols;
WINDOW *win;

getmaxyx(stdscr, lines, cols);

win = newwin(lines, cols, 0, 0);
init_pair(1, COLOR_RED, COLOR_BLACK);
attrset(COLOR_PAIR(1) | A_BOLD);
wattrset(win, COLOR_PAIR(1));

wrefresh(win);

mvwprintw(win, (lines + 0), (cols), "Line 1");
mvwprintw(win, (lines + 1), (cols), "Line 2");
mvwprintw(win, (lines + 2), (cols), "Line 3");
mvwprintw(win, (lines + 3), (cols), "Line 4");

wrefresh(win);

getch();

endwin();
return 0;
}

Thank you for your help!

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Calle wrote:
>I have some problems with ncurses.
>Could someone tell me why it doesn't print anything out?
>
>#include <ncurses.h>
>
>int main()
>{
>   initscr();
>   cbreak();
>   noecho();
>   start_color();
>
>   int lines, cols;
>   WINDOW *win;
>
>   getmaxyx(stdscr, lines, cols);
>
>   win = newwin(lines, cols, 0, 0);
>   init_pair(1, COLOR_RED, COLOR_BLACK);
>   attrset(COLOR_PAIR(1) | A_BOLD);
>   wattrset(win, COLOR_PAIR(1));
>
>   wrefresh(win);

Adding:

refresh();

here makes it work almost how you want,

>   mvwprintw(win, (lines + 0), (cols), "Line 1");
>   mvwprintw(win, (lines + 1), (cols), "Line 2");
>   mvwprintw(win, (lines + 2), (cols), "Line 3");
>   mvwprintw(win, (lines + 3), (cols), "Line 4");

On my 80x24 terminal this tries to print the four lines at:
80x24, 80x25, 80x26 and 80x27, which are all out of bounds.
Valid coordinates are
y = 0 to (lines - 1), and
x = 0 to (cols - 1)

>
>   wrefresh(win);
>
>   getch();
>
>   endwin();
>   return 0;
>}
>
>Thank you for your help!

Hope that helps!

--
Eric Enright                   /"\
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Public Key: 0xBEDF636F         / \

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Calle <calle8787@hotmail.com> wrote:
> I have some problems with ncurses.
> Could someone tell me why it doesn't print anything out?

The getch() refreshes stdscr, which overwrites the other windows.
See the discussion of doupdate() and wnoutrefresh().

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net

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In article <f81f4cdc.0406231436.2e202dad@posting.google.com>,
calle8787@hotmail.com (Calle) wrote:

> I have some problems with ncurses.
> Could someone tell me why it doesn't print anything out?
[snip]
>    win = newwin(lines, cols, 0, 0);
[snip]
>    mvwprintw(win, (lines + 0), (cols), "Line 1");
>    mvwprintw(win, (lines + 1), (cols), "Line 2");
>    mvwprintw(win, (lines + 2), (cols), "Line 3");
>    mvwprintw(win, (lines + 3), (cols), "Line 4");

Window coordinates start at (0, 0).  You're trying to write starting at
(lines, cols), which is outside the window you created.

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