NCurses Library Reference in Java

Creating Quick Response Code in Java NCurses Library Reference
Appendix A
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NCurses Library Reference
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The default state for interrupt flushing is set by the terminal and inherited by your NCurses program.
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Examples
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intrflush(NULL,TRUE);
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Here, the intrflush() state is set TRUE, meaning that the input buffer is flushed when an interrupt key is pressed.
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intrflush(NULL,TRUE);
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The intrflush() state is set above to FALSE, meaning that the input is not flushed when an interrupt key is pressed but may be flushed afterwards.
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Sample Program
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 #include <ncurses.h> int main(void) { char buffer[81]; initscr(); intrflush(NULL,FALSE); addstr( Type on the keyboard whilst I wait...\n ); refresh(); napms(5000); /* 5 seconds */ addstr( Here is what you typed:\n ); getnstr(buffer,80); refresh(); endwin(); return 0; }
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Sample output:
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Type on the keyboard whilst I wait...
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Type something; then press Ctrl+C. The Ctrl+C quits the program, and then you ll see the text you typed appear at the prompt.
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Also See
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flushinp(), qiflush(), typeahead()
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Appendix A
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NCurses Library Reference
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isendwin()
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The isendwin() function is used to determine whether NCurses visual mode has not been reactivated after a call to the endwin() function has been made.
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Explanation
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Though endwin() is officially the End of NCurses Program function, it s still possible to use NCurses functions after the endwin() call has been made. For example, endwin() can be used to suspend NCurses visual mode and return to tty mode. Afterwards, any subsequent calls to refresh() or doupdate() restore NCurses visual mode, meaning that though endwin() has been called, NCurses functions are still being used. (The endwin() function still needs to be called when the program really does quit.) The isendwin() function returns TRUE if endwin() has been called and the program has not re-activated NCurses visual mode. isendwin() returns FALSE if endwin() has been called and followed by a refresh() or doupdate() function to once again activate NCurses visual mode.
Man Page Format
bool isendwin(void);
Format Reference
The function has no arguments.
Return Value
A Boolean value, either TRUE or FALSE, both of which are defined in NCURSES.H. TRUE is returned when the endwin() function has been called and NCurses visual mode has been restarted by a refresh() or doupdate() function. FALSE is returned when endwin() has been called and NCurses has not returned to visual mode.
Notes
Do not use this function to determine whether or not NCurses is in visual mode. FALSE is returned when isendwin() is called before endwin() has been issued.
Appendix A
NCurses Library Reference
Calling isendwin() before initscr() or newterm() has initialized NCurses isn t necessarily a Bad Thing; like other NCurses functions used outside of initialization it will merely return FALSE. I refer to this as the Is it really over function.
Examples
endwin(); if(isendwin())
The if condition evaluates to TRUE because the endwin() function was just issued.
endwin(); refresh(); if(isendwin())
The if condition evaluates to FALSE because although the endwin() function has been issued, the refresh() function has restarted NCurses visual mode.
Sample Program
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 after 23 #include <ncurses.h> int main(void) { initscr(); addstr( Press Enter to temporarily suspend this program:\n ); refresh(); getch(); endwin(); fputs( Program suspended... ,stdout); if(isendwin()) fputs( isendwin() returns TRUE... ,stdout); else fputs( isendwin() returns FALSE... ,stdout); puts( Press Enter: ); fflush(stdout); getch(); addstr( Now NCurses visual mode has been restarted ; endwin().\n ); if(isendwin())
Appendix A
24 25 26 27 28 29 30 31 32
NCurses Library Reference
addstr( isendwin() returns TRUE.\n ); else addstr( isendwin() returns FALSE.\n ); refresh(); getch(); endwin(); return 0; }
Sample output:
Press Enter to temporarily suspend this program:
Press Enter and the program ends. You see:
Program suspended...isendwin() returns TRUE...Press Enter:
Press Enter:
Press Enter to temporarily suspend this program: Now NCurses visual mode has been restarted after endwin(). isendwin() returns TRUE.
Also See
endwin()
is_linetouched()
The is_linetouched() function determines whether a line of text in a window has been altered since the last screen update.