Today I will show a simple source code with two functions. This source code will try to read from a file named level.txt a string like this: 101010100000011111101110101010101 and show empty spaces and square ASCII based on this string. You can compile this source code from a file named screen.c like this:
1 2 | [mythcat@fedora GUI]$ gcc -o screen screen.c -lncurses [mythcat@fedora GUI]$ ./screen |
Let’s see… Read More »
Today, I will show a source code with ncurses that show you extended characters. Run the executable into your tty not on the terminal, because you don’t see all of these characters. Let’s see the source code :
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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | #include <ncurses.h> int main(void) { int counter, counter2=0; initscr(); curs_set(0); attron(A_UNDERLINE); mvprintw(0,24,"NCURSES ALTCHARSET CHARACTERS\n"); attroff(A_UNDERLINE); for (counter=43; counter < 256; counter++) { printw("%3d = ", counter); addch(counter | A_ALTCHARSET); if (counter2 < 7) { addch(' '); addch(ACS_VLINE); printw(" "); } counter2++; if (counter2 > 7) { addch('\n'); counter2=0; } switch (counter) { case 46: counter=47; break; case 48: counter=95; break; case 97: counter=101; break; case 126: counter=127; break; case 128: counter=160; break; case 172: counter=173; } } getch(); endwin(); return 0; } |
I
In this tutorial, I will show you how to put buttons like a matrix:
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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | #include <ncurses.h> int main() { // Initialize ncurses initscr(); cbreak(); // Permite citirea tastelor fără a aștepta apăsarea tastei Enter noecho(); // Nu afișează caracterele tastate pe ecran // Crearea fereastrei principale WINDOW *win = newwin(7, 19, 0, 0); box(win, 0, 0); // Afiseaza bordura ferestrei refresh(); // Afișează modificările // Crearea butoanelor WINDOW *button1 = derwin(win, 1, 4, 1, 1); WINDOW *button2 = derwin(win, 1, 4, 1, 6); WINDOW *button3 = derwin(win, 1, 4, 1, 11); WINDOW *button4 = derwin(win, 1, 4, 3, 1); WINDOW *button5 = derwin(win, 1, 4, 3, 6); WINDOW *button6 = derwin(win, 1, 4, 3, 11); WINDOW *button7 = derwin(win, 1, 4, 5, 1); WINDOW *button8 = derwin(win, 1, 4, 5, 6); WINDOW *button9 = derwin(win, 1, 4, 5, 11); WINDOW *button0 = derwin(win, 1, 9, 7, 1); // Setarea caracteristicilor butoanelor keypad(button1, TRUE); keypad(button2, TRUE); keypad(button3, TRUE); keypad(button4, TRUE); keypad(button5, TRUE); keypad(button6, TRUE); keypad(button7, TRUE); keypad(button8, TRUE); keypad(button9, TRUE); keypad(button0, TRUE); wprintw(button1, "1"); wprintw(button2, "2"); wprintw(button3, "3"); wprintw(button4, "4"); wprintw(button5, "5"); wprintw(button6, "6"); wprintw(button7, "7"); wprintw(button8, "8"); wprintw(button9, "9"); wprintw(button0, "0"); wrefresh(win); // Așteaptă apăsarea unei taste getch(); // Curățarea memoriei și închiderea ncurses delwin(button1); delwin(button2); delwin(button3); delwin(button4); delwin(button5); delwin(button6); delwin(button7); delwin(button8); delwin(button9); delwin(button0); delwin(win); endwin(); return 0; } |
The derwin() function is used to create a new window with these arguments : win is the parent window in which the subwindow will be created. 1 is the number of rows of the subwindow. 4 is the number of… Read More »
In this tutorial, I will show you something very simple without using the ncurses library. It is about using arguments in the command line. Create a file default.c and complete it with the source code below:
1 2 3 4 5 6 7 8 9 10 | #include <stdio.h> int main(int argc, char **argv) { printf("default command \n"); printf("argc = %d\n", argc); for(int i = 0; i < argc; i++) { printf("argv[%d] = %s\n", i, argv[i]); } return 0; } |
Use the gcc command tool to build this source code:
1 | [mythcat@fedora cmdsLinux]$ gcc -o default default.c |
You can test the new command named… Read More »
Another source code with ncurses. This time the source code will create a window with all colors.
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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 | /* color-demo.c */ #include <curses.h> #include <stdio.h> #include <stdlib.h> void init_colorpairs(void); short curs_color(int fg); int colornum(int fg, int bg); void setcolor(int fg, int bg); void unsetcolor(int fg, int bg); void init_colorpairs(void) { int fg, bg; int colorpair; for (bg = 0; bg <= 7; bg++) { for (fg = 0; fg <= 7; fg++) { colorpair = colornum(fg, bg); init_pair(colorpair, curs_color(fg), curs_color(bg)); } } } short curs_color(int fg) { switch (7 & fg) { /* RGB */ case 0: /* 000 */ return (COLOR_BLACK); case 1: /* 001 */ return (COLOR_BLUE); case 2: /* 010 */ return (COLOR_GREEN); case 3: /* 011 */ return (COLOR_CYAN); case 4: /* 100 */ return (COLOR_RED); case 5: /* 101 */ return (COLOR_MAGENTA); case 6: /* 110 */ return (COLOR_YELLOW); case 7: /* 111 */ return (COLOR_WHITE); } } int colornum(int fg, int bg) { int B, bbb, ffff; B = 1 << 7; bbb = (7 & bg) << 4; ffff = 7 & fg; return (B | bbb | ffff); } // set the color pair by colornum and bold/bright A_BOLD void setcolor(int fg, int bg) { attron(COLOR_PAIR(colornum(fg, bg))); attron(A_BOLD); } // unset the color pair by colornum and bold/bright A_BOLD void unsetcolor(int fg, int bg) { attroff(COLOR_PAIR(colornum(fg, bg))); attroff(A_BOLD); } // main function int main(void) { int fg, bg; // initialize curses initscr(); keypad(stdscr, TRUE); cbreak(); noecho(); // initialize colors if (has_colors() == FALSE) { endwin(); puts("Your terminal does not support color"); exit(1); } start_color(); init_colorpairs(); // draw test pattern if ((LINES < 24) || (COLS < 80)) { endwin(); puts("Your terminal needs to be at least 80x24"); exit(2); } mvaddstr(0, 35, " COLORS used in ncurses ! "); mvaddstr(2, 0, " low intensity from 0-7 "); mvaddstr(12, 0, " high intensity from 8-15 "); for (bg = 0; bg <= 7; bg++) { for (fg = 0; fg <= 7; fg++) { setcolor(fg, bg); mvaddstr(fg + 3, bg * 10, " COLOR "); unsetcolor(fg, bg); } for (fg = 8; fg <= 15; fg++) { setcolor(fg, bg); mvaddstr(fg + 5, bg * 10, " COLOR "); unsetcolor(fg, bg); } } mvaddstr(LINES - 1, 0, "You can press any key to quit"); // refresh the screen refresh(); // get key getch(); // close window endwin(); exit(0); } |
This is result of the source code:
In this tutorial, I will show a source code that creates a border and a taskbar with three tasks assigned to keys F5, F6, and F7. This source code has two main areas: win and taskbar_win. Both pointers are good and each of these is defined for each window. The source code is commented on… Read More »
I started a new project since my monitor broke and I can no longer use the PC. I have an old HP Compaq 6710b laptop with Fedora 39 Linux Distro. The project contains software for the terminal in Linux. The first is an online radio that uses mpg123, and you can find it in this… Read More »
If you want to try the Raspberry Pi ARM operating system in Windows 10 then you need to install the Qemu free and open-source emulator. I used this version qemu-w32-setup-20220419 from the official webpage. After installation, you need to download in the same folder with the qemu installation this software kernel-qemu-4.4.34-jessie and the Rasberry Pi… Read More »