Sample Program in Java

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Sample Program
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1 #include <ncurses.h> 2 3 int main(void) 4 { 5 initscr(); 6 start_color(); 7 init_pair(1,COLOR_WHITE,COLOR_BLUE); 8 9 addstr( This is the standard screen as it normally ; appears.\n ); 10 addstr( The cursor is synchronized -> ); 11 refresh(); 12 getch(); 13 14 leaveok(stdscr,TRUE); 15 bkgd(COLOR_PAIR(1)); 16 addstr( \n\nThe cursor is now not being updated.\n ); 17 addstr( This means that its position could be anywhere.\n ); 18 refresh(); 19 getch(); 20 21 endwin(); 22 return 0; 23 }
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Appendix A
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NCurses Library Reference
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Sample output:
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This is the standard screen as it normally appears. The cursor is synchronized ->
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The cursor appears after the >. Press Enter and the screen is painted white-on-blue, and the cursor blinks in the lower-right corner (well, on my screen).
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The cursor is now not being updated. This means that its position could be anywhere.
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Also See
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refresh(), curs_set(), getsyx()
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LINES
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The LINES constant is an int value set internally by NCurses to represent the number of rows, or lines, available on the standard screen.
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Man Page Format
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Not applicable.
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Format Reference
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LINES works like any C language constant. It can be used as an immediate value, in a comparison, or in combination with other values.
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Return Value
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The value of LINES depends on the number of rows in the terminal or standard screen, stdscr. LINES is an int.
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Notes
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Most standard terminal windows have either 24 or 25 rows. Do note that with terminal windows in graphical environments, terminals can be just about any size. Also, some text screens have the ability to show 30, 40, 50, or even more rows.
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Appendix A
NCurses Library Reference
ROWS is a variable, not a constant. Note that changing the value of ROWS does not re-size the standard screen or terminal window. Normally NCurses sets LINES equal to the LINES environment variable. This can be changed by using the use_env() function. See use_env(). Use the getmaxyx() function to determine the number of rows in any NCurses window. Yeah, this should really be ROWS, but who am I
Examples
printw( This screen has only %d rows.\n ,LINES);
Here, the printw() function displays the value of LINES in a string of text put to the screen.
if(LINES<25)
This statement tests to see if the value of LINES is less than 25. If so, then the next block of statements are executed.
Sample Program
Refer to the entry for COLS for a sample program and output.
Also See
COLS, getmaxyx(), use_env()
longname()
The longname() function returns a string describing the current terminal.
Man Page Format
char *termname(void);
Format Reference
The function has no arguments.
Appendix A
NCurses Library Reference
Return Value
A string representing information about the terminal. On error, NULL is returned.
Notes
It s best to call longname() after the initscr() or newterm() function has been used. The termname() function returns only the terminal s name, which may be part of the string returned by longname(). The string longname() returns is the verbose terminal description but not that verbose! The maximum number of characters returned by longname() is 128, which includes the trailing \0. Other functions that return information about the terminal include baudrate(), erasechar(), killchar(), has_il(), has_ic(), termattrs(), and termname().
Example
tp = longname();
Here, the memory location of the string returned by the longname() function is saved in the tp pointer.
Sample Program
1 2 3 4 5 6 7 8 9 10 11 12 13 14 #include <ncurses.h> int main(void) { initscr(); addstr( Here is the longname() information:\n ); addstr(longname()); refresh(); getch(); endwin(); return 0; }
Sample output:
Here is the longname() information: generic color xterm
Appendix A
NCurses Library Reference
Also See
termname()
meta()
The meta() function controls whether the keyboard is read in 7-bit or 8-bit mode.
Explanation
Meta comes from old terminal keyboards that had a Meta key, similar to the Alt key on a PC or the Command key on a Mac. The Meta key was a special shift key used in combination with other keys to allow for extended input of keyboard commands. In many cases, the Meta key merely added the 8th bit on input of standard keys. So the U key, which has a 7-bit value of 1010101 would have the 8-bit value 11010101 when input with the Meta key pressed.
Man Page Format
int meta(WINDOW *win, bool bf);
Format Reference
win is the name of a WINDOW variable representing a window on the screen. The man page says that this argument, however, is ignored. bf is a Boolean value, TRUE to enable the reading of the 8th bit on input, FALSE to restrict character input to 7 bits.