And it pretty much works as you would expect it to. in Java

Print QR-Code in Java And it pretty much works as you would expect it to.
And it pretty much works as you would expect it to.
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Swallowing Only So Much of a String
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Rather than risk some idiot typing 3,000 characters of text for his first name (the latter part of which is a worm program designed to hijack your computer), use the getnstr() function instead of getstr(). That n in there means accept only n characters of input, a wise and logical addition to the input command. Listing 2-8 shows a subtle modification of the previous string1.c program.
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Listing 2-8: STRING2.C
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 #include <ncurses.h>
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int main(void) { char first[4]; char last[4]; initscr(); addstr( Enter the first 3 letters of your first name ); refresh(); getnstr(first,3); addstr( Enter the first 3 letters of your last name ); refresh(); getnstr(last,3); addstr( Your secret agent name is ); printw( %s%s ,first,last); addch( ! ); refresh(); getch();
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Listing 2-8 (continued)
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23 24 25 endwin(); return 0; }
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The size of the input buffers, first and last, is set to 4 characters. That s 3 letters plus the null \0 at the end of the string. Note the format for getnstr(): First comes the character buffer, then the maximum character count. Users can still backspace and erase after reaching that number of characters, but if they try to type any more, the computer beeps at them (or the screen flashes). The printw() function displays the two short strings. Finally addch() is used to display the exclamation point.
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The Obligatory scanw() Program
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I m not a big scanf() fan (as you already know if you ve read my C programming books); therefore you re not going to be seeing much of scanw() outside of this section. Given that, Listing 2-9 shows the obligatory demonstration of scanw().
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Listing 2-9: SUSHI.C
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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 #include <ncurses.h> #define UNI 4.5 int main(void) { int pieces; initscr(); addstr( SUSHI BAR ); move(3,0); printw( We have Uni today for $%.2f.\n ,UNI); addstr( How many pieces would you like ); refresh(); scanw( %d ,&pieces); printw( You want %d pieces \n ,pieces); printw( That will be $%.2f! ,UNI*(float)pieces); refresh(); getch(); endwin(); return 0; }
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Again, this could just be a simple scanf() program, though scanw() is used instead. I ve not much more to say about it, mostly because, as I ve already mentioned, I m not a big scanf() fan.
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T I P The big flub everyone makes with scanf()/scanw() is forgetting the ampersand before nonarray variable names. That one will cost you a core dump or three if you don t catch it.
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Formatting Text
NCurses not only puts text up on the screen; it also lets you put text on the screen with style. While the style may not be as elaborate as the styles offered in a GUI word processor, it is enough to add emphasis, fun, and perhaps a wee bit o color to what would otherwise be boring terminal text.
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There are three useful functions that control the tone of the text displayed on the screen: attrset(attr) attron(attr) attroff(attr) The attrset() function sets text attributes. It directs NCurses to apply the attribute(s) specified to all text displayed from that point onward. The attron() and attroff() functions turn specific text attributes on or off, respectively. There is some confusion regarding whether to use attrset() or attron() to apply text attributes. You can use either one. For example: attrset(A_BOLD);
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Formatting Text
attron(A_BOLD); Both these statements apply the bold text attribute to any text displayed afterward. The difference is that attrset() turns off all other attributes previously applied, leaving only bold applied to the text, while attron() adds the bold attribute to any attributes already applied to the text.
More than Boring Black and White (but Not Much)
When you start up NCurses, the text output is displayed using the normal (A_NORMAL) text attribute. That equates to the standard white text on a black background or however you have your terminal configured (for example, green text on a white background or whatever). But that s so boring! Table 3-1 lists the basic (noncolor) text attributes you can apply to text using the attrset() or attron() functions.
Table 3-1: NCurses Text Attributes ATTRIBUTE NAME A_ALTCHARSET A_BLINK A_BOLD A_DIM A_INVIS A_NORMAL A_REVERSE A_STANDOUT A_UNDERLINE A_PROTECT A_HORIZONTAL A_LEFT A_LOW A_RIGHT A_TOP A_VERTICAL Not implemented WHAT IT DOES Displays text using an alternative character set (defined by your terminal) Annoying blinking text Bright text, bold text, thick text (depending on terminal type) Dimmed text (not as bright as regular text) Hidden text (available only on certain terminals) Normal text Inverse text Same as standout() Underline text Protected text, available only on certain terminals, prevents text from being overwritten.