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Also See
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10, overlay(), overwrite(), dupwin()
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curs_set()
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The curs_set() function controls the cursor s visibility.
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Man Page Format
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int curs_set(int visibility);
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Format Reference
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The value of visibility can be 0, 1, or 2:
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0 makes the cursor invisible 1 sets the cursor to normal mode 2 sets the cursor to a very visible mode
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Return Value
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The function returns a value, 0, 1, 2, representing the previous cursor state, defined above. ERR is returned if the cursor state cannot be changed.
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Appendix A
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NCurses Library Reference
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Notes
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Not all terminals support the curs_set() function. By returning the cursor s previous state, it s possible to restore the cursor later. But note that the endwin() function restores the terminal s cursor to a visible state if curs_set() has altered it. However, the cursor may not be restored to the same state it was in before the NCurses program was started, meaning that if the cursor was invisible when your program started, that state will not be restored when your program ends.
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Examples
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curs_set(0);
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This command makes the cursor invisible.
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curs_set(1);
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Here, the cursor is restored to normal, visible mode.
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Sample Program
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 #include <ncurses.h> int main(void) { int r; initscr(); /* first, turn the cursor off */ r = curs_set(0); if(r == ERR) { endwin(); puts( This terminal cannot change the cursor. ); return(1); } addstr( The cursor has been turned off: ); refresh(); getch(); /* second, turn the cursor on */ curs_set(1); move(1,0); addstr( The cursor now on: ); refresh(); getch(); /* third, turn the cursor very on */
Appendix A
28 29 30 31 32 33 34 35 36 37
NCurses Library Reference
curs_set(2); move(2,0); addstr( The cursor is now very on: ); refresh(); getch(); curs_set(r); endwin(); return 0; } /* restore cursor */
Sample output:
This terminal cannot change the cursor.
The cursor has been turned off: The cursor now on: The cursor is now very on:
Each line is followed by the cursor in the indicated state.
Also See
14, move()
curses_version()
The curses_version() function returns a string that describes the name, version, release, and patch information for the version of NCurses being run. This is an extended NCurses function.
Man Page Format
const char * curses_version(void);
Format Reference
The function has no arguments.
Return Value
The function returns a string in the format:
ncurses major.minor.patch
Appendix A
NCurses Library Reference
The text ncurses begins the string. It stands for NCurses or New Curses, the version of the NCurses library used to compile the program. major is the major release number. minor is the minor release number. patch is the number of the most recent patch.
Notes
Several constants defined in NCURSES.H contain similar information for determining NCurses version, as listed in Table A-4. The NCURSES_VERSION string is simply the NCURSES_VERSION_MAJOR and NCURSES_VERSION_MINOR values, separated by a dot.
Example
vernum = curses_version();
Here, the string returned by curses_version() is stored in the char array (string variable) vernum.
Sample Program
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 #include <ncurses.h> int main(void) { initscr(); #ifdef NCURSES_VERSION printw( This is %s.\n ,curses_version()); #else printw( You are apparently not using NCurses.\n ); #endif refresh(); getch(); endwin(); return 0; }
Sample output: Hopefully, something like:
This is ncurses 5.4.20040208.
Appendix A
NCurses Library Reference
Table A-4: NCurses version constants CONSTANT NCURSES_VERSION NCURSES_VERSION_MAJOR NCURSES_VERSION_MINOR NCURSES_VERSION_PATCH DEFINES String containing NCurses major and minor versions Major version number Minor version number Patch number
Also See
NCURSES_VERSION
delch()
The delch() function deletes the character at the cursor s position. Any characters to the right on the same line are then slid one place to the left. Blanks are used to fill in the end of the line.
Man Page Formats
int int int int delch(void); wdelch(WINDOW *win); mvdelch(int y, int x); mvwdelch(WINDOW *win, int y, int x);
Format Reference
The base function has no arguments; refer to the mv, mvw, and w prefix entries elsewhere in this appendix for information on the win, y, and x arguments.
Return Value
OK on success, or ERR on failure.
Notes
This function does not change the cursor s position. To delete a line of text, use the deleteln() function. To insert a single character, the insch() function is used.