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{{task|Terminal control}}[[Terminal Control::task| ]]
Determine the character displayed on the screen at column 3, row 6 and store that character in a variable. Note that it is permissible to utilize system or language provided methods or system provided facilities, system maintained records or available buffers or system maintained display records to achieve this task, rather than query the terminal directly, if those methods are more usual for the system type or language.
 
=={{header|Action!}}==
Method 1: terminal reading
<syntaxhighlight lang="action!">proc Main()
byte CHARS, cursorinh=$2F0
 
graphics(0) cursorinh=1
 
position(2,2) printe("Action!")
 
CHARS=Locate(2,2) position(2,2) put(CHARS)
 
cursorinh=0
position(2,4) printf("Character at column 2 row 2 was %C",CHARS)
 
return</syntaxhighlight>
 
=={{header|AutoHotkey}}==
{{works with|AutoHotkey_L}}
<p>AutoHotkey is not built for the command line, so we need call the WinAPI directly.</p><p>For fun, this writes random characters to the command window so that it has something to retrieve. </p>
<langsyntaxhighlight AHKlang="ahk">DllCall( "AllocConsole" ) ; create a console if not launched from one
hConsole := DllCall( "GetStdHandle", int, STDOUT := -11 )
Loop 10
Line 41 ⟶ 57:
return out
return 0
}</langsyntaxhighlight>
 
=={{header|BASIC}}==
 
==={{header|Applesoft BASIC}}===
<langsyntaxhighlight ApplesoftBasiclang="applesoftbasic"> 10 DEF FN C(H) = SCRN( H - 1,(V - 1) * 2) + SCRN( H - 1,(V - 1) * 2 + 1) * 16
20 LET V = 6:C$ = CHR$ ( FN C(3))</langsyntaxhighlight>
 
==={{header|LocomotiveBBC BasicBASIC}}===
{{works with|BBC BASIC for Windows}}
<syntaxhighlight lang="bbcbasic"> PRINT TAB(2,5) "Here"
char$ = GET$(2,5)
PRINT ''"Character at column 3 row 6 was " char$</syntaxhighlight>
{{works with|all BBC BASICs}} that support calling OSBYTE
<syntaxhighlight lang="bbcbasic"> PRINT TAB(2,5) "Here"
PRINT TAB(2,5); : REM Position cursor over character to read
A%=&87:char%=((USR&FFF4)AND&FF00)DIV256 : REM Ask operating system to read character
PRINT ''"Character at column 3 row 6 was CHR$(";char%;")"</syntaxhighlight>
 
==={{header|FreeBASIC}}===
<lang locobasic>10 LOCATE 3,6
The top Left corner Is at position 0,0
20 a$=COPYCHR$(#0)</lang>
<syntaxhighlight lang="freebasic">'Works on Windows. On Linux, the value returned can differ from the character shown on the console.
'For example, unprintable control codes - such as the LF character (10) that implicitly occurs
'after the end of Printed text - may be picked up instead of the untouched character in its place.
 
Print "T@4;4G,XIJ"
Print ">C+PE0)RM;"
Print "JEV6B/8E?H"
Print "FSC>41UIGR"
Print "V>41JMXMOW"
Print "IY0*KH6M;B"' Character at column 3, row 6 = 0
Print "-6<UL*>DU7"
Print "MZ))<5D:B8"
Print ".@UB/P6UQ)"
Print "<9HYH)<ZJF"
 
Dim As Integer char_ascii_value = Screen(6,3)
Locate 6, 14 : Print "Character at column 3, row 6 = "; Chr(char_ascii_value)
Sleep</syntaxhighlight>
 
 
==={{header|Locomotive Basic}}===
<syntaxhighlight lang="locobasic">10 LOCATE 3,6
20 a$=COPYCHR$(#0)</syntaxhighlight>
 
Amstrad CPC screen memory only stores pixels but no character information (as opposed to e.g. the C64), so the firmware routine (TXT_UNWRITE) called by BASIC works by trying to find a match between screen pixels and the shape of a currently defined character. If the character table or screen pixels in the area of the character are changed between writing and reading, COPYCHR$ will therefore fail.
 
===[[QuickBASIC#QBasic|QBasic]]===
 
The top left corner is (1, 1).
 
<langsyntaxhighlight lang="qbasic">c$ = CHR$(SCREEN(6, 3))</langsyntaxhighlight>
 
=== {{header|ZX Spectrum Basic}} ===
<langsyntaxhighlight lang="basic"> 10 REM The top left corner is at position 0,0
20 REM So we subtract one from the coordinates
30 LET c$ = SCREEN$(5,2)</langsyntaxhighlight>
 
=={{header|BBC BASIC}}==
{{works with|BBC BASIC for Windows}}
<lang bbcbasic> PRINT TAB(2,5) "Here"
char$ = GET$(2,5)
PRINT ''"Character at column 3 row 6 was " char$</lang>
 
=={{header|C}}==
Line 77 ⟶ 118:
 
{{libheader|Win32}}
<langsyntaxhighlight lang="c">#include <windows.h>
#include <wchar.h>
 
Line 109 ⟶ 150:
wprintf(L"Character at (3, 6) had been '%lc'\n", c);
return 0;
}</langsyntaxhighlight>
 
=={{header|Common Lisp}}==
==={{header|ncurses}}===
To interface the ncurses C library from Lisp, the ''croatoan'' library is used.
<syntaxhighlight lang="lisp">(defun positional-read ()
(with-screen (scr :input-blocking t :input-echoing nil :cursor-visible nil)
;; print random characters in a 10x20 grid
(loop for i from 0 to 9 do
(loop for j from 0 to 19 do
(add-char scr (+ 33 (random 94)) :y i :x j)))
;; highlight char to extract at row 6 column 3
(change-attributes scr 1 (list :reverse) :y 5 :x 2)
(refresh scr)
;; wait for keypress
(get-char scr)
;; extract char from row 6 column 3
(let ((char (extract-char scr :y 5 :x 2)))
;; then print it out again
(move scr 11 0)
(format scr "extracted char: ~A" char))
(refresh scr)
(get-char scr)))</syntaxhighlight>
 
=={{header|Go}}==
{{trans|Kotlin}}
<syntaxhighlight lang="go">package main
 
/*
#include <windows.h>
*/
import "C"
import "fmt"
 
func main() {
for i := 0; i < 80*25; i++ {
fmt.Print("A") // fill 80 x 25 console with 'A's
}
fmt.Println()
conOut := C.GetStdHandle(C.STD_OUTPUT_HANDLE)
info := C.CONSOLE_SCREEN_BUFFER_INFO{}
pos := C.COORD{}
C.GetConsoleScreenBufferInfo(conOut, &info)
pos.X = info.srWindow.Left + 3 // column number 3 of display window
pos.Y = info.srWindow.Top + 6 // row number 6 of display window
var c C.wchar_t
var le C.ulong
ret := C.ReadConsoleOutputCharacterW(conOut, &c, 1, pos, &le)
if ret == 0 || le <= 0 {
fmt.Println("Something went wrong!")
return
}
fmt.Printf("The character at column 3, row 6 is '%c'\n", c)
}</syntaxhighlight>
 
{{out}}
<pre>
The character at column 3, row 6 is 'A'
</pre>
 
=={{header|Julia}}==
{{trans|Raku}}
<syntaxhighlight lang="julia">using LibNCurses
 
randtxt(n) = foldl(*, rand(split("1234567890abcdefghijklmnopqrstuvwxyz", ""), n))
 
initscr()
 
for i in 1:20
LibNCurses.mvwaddstr(i, 1, randtxt(50))
end
 
row = rand(1:20)
col = rand(1:50)
ch = LibNCurses.winch(row, col)
LibNCurses.mvwaddstr(col, 52, "The character at ($row, $col) is $ch.") )
</syntaxhighlight>
 
=={{header|Kotlin}}==
This is based on the C entry and works on Windows 10:
<syntaxhighlight lang="scala">// Kotlin Native version 0.3
 
import kotlinx.cinterop.*
import win32.*
 
fun main(args: Array<String>) {
for (i in 0 until (80 * 25)) print("A") // fill 80 x 25 console with 'A's
println()
memScoped {
val conOut = GetStdHandle(-11)
val info = alloc<CONSOLE_SCREEN_BUFFER_INFO>()
val pos = alloc<COORD>()
GetConsoleScreenBufferInfo(conOut, info.ptr)
pos.X = (info.srWindow.Left + 3).toShort() // column number 3 of display window
pos.Y = (info.srWindow.Top + 6).toShort() // row number 6 of display window
val c = alloc<wchar_tVar>()
val len = alloc<IntVar>()
ReadConsoleOutputCharacterW(conOut, c.ptr, 1, pos.readValue(), len.ptr)
if (len.value == 1) {
val ch = c.value.toChar()
println("The character at column 3, row 6 is '$ch'")
}
else println("Something went wrong!")
}
}</syntaxhighlight>
 
{{out}}
<pre>
The character at column 3, row 6 is 'A'
</pre>
 
=={{header|Ksh}}==
<syntaxhighlight lang="ksh">
#!/bin/ksh
 
# Determine the character displayed on the screen at column 3, row 6 and
# store that character in a variable.
#
# Use a group of functions "shellcurses"
 
# # Variables:
#
FPATH="/usr/local/functions/shellcurses/"
 
rst="�[0m"
red="�[31m"
whi="�[37m"
 
integer row=${1:-6} col=${2:-3} # Allow command line row col input
 
# # 10x10 grid of random digits
#
typeset -A grid
for ((i=0; i<10; i++)); do
for ((j=0; j<10; j++)); do
(( grid[${i}][${j}] = (RANDOM % 9) + 1 ))
done
done
 
# # Functions:
#
 
 
######
# main #
######
# # Initialize the curses screen
#
initscr ; export MAX_LINES MAX_COLS
 
# # Display the random number grid with target in red
#
clear
for ((i=1; i<=10; i++)); do
for ((j=1; j<=10; j++)); do
colr=${whi}
(( i == row )) && (( j == col )) && colr=${red}
mvaddstr ${i} ${j} "${colr}${grid[$((i-1))][$((j-1))]}${rst}"
done
done
 
str=$(rtnch ${row} ${col}) # return char at (row, col) location
 
mvaddstr 12 1 "Digit at (${row},${col}) = ${str}" # Display result
move 14 1
refresh
endwin</syntaxhighlight>
 
{{out}}<pre>
2466511215
6743931696
7546513188
7233775996
4748942123
8893655153
8341639139
8772676987
3772947552
8454526539
 
Digit at (6,3) = 9</pre>
 
=={{header|Nim}}==
{{trans|Raku}}
{{trans|Julia}}
{{libheader|nim-ncurses}}
This Nim version is inspired by Raku and Julia versions.
<syntaxhighlight lang="nim">import random, sequtils, strutils
import ncurses
 
randomize()
 
let win = initscr()
assert not win.isNil, "Unable to initialize."
 
for y in 0..9:
mvaddstr(y.cint, 0, newSeqWith(10, sample({'0'..'9', 'a'..'z'})).join())
 
let row = rand(9).cint
let col = rand(9).cint
let ch = win.mvwinch(row, col)
 
mvaddstr(row, col + 11, "The character at ($1, $2) is $3.".format(row, col, chr(ch)))
mvaddstr(11, 0, "Press any key to quit.")
refresh()
discard getch()
 
endwin()</syntaxhighlight>
 
{{out}}
<pre>tw5bl8mhvl
37t0nvwjhr
055co0b3hm
409stl3jgv The character at (3, 8) is g.
a9j5354rci
o5ymlrtgt2
9yjag11u7n
2nv32g6s7x
3l1zujlpl2
opkl6us0mf
 
Press any key to quit.</pre>
 
=={{header|Perl}}==
{{trans|Raku}}
<syntaxhighlight lang="perl"># 20200917 added Perl programming solution
 
use strict;
use warnings;
 
use Curses;
 
initscr or die;
 
my $win = Curses->new;
 
foreach my $row (0..9) {
$win->addstr( $row , 0, join('', map { chr(int(rand(50)) + 41) } (0..9)))
};
 
my $icol = 3 - 1;
my $irow = 6 - 1;
 
my $ch = $win->inch($irow,$icol);
 
$win->addstr( $irow, $icol+10, 'Character at column 3, row 6 = '.$ch );
 
$win->addstr( LINES() - 2, 2, "Press any key to exit..." );
 
$win->getch;
 
endwin;</syntaxhighlight>
 
=={{header|Phix}}==
<!--<syntaxhighlight lang="phix">(notonline)-->
<lang Phix>--
<span style="color: #000080;font-style:italic;">--
-- demo\rosetta\Positional_read.exw
-- demo\rosetta\Positional_read.exw
-- ================================
-- ================================
--
--</span>
position(6,1) -- line 6 column 1 (1-based)
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (position, get_screen_char)</span>
puts(1,"abcdef")
<span style="color: #7060A8;">position</span><span style="color: #0000FF;">(</span><span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- line 6 column 1 (1-based)</span>
integer {ch,attr} = get_screen_char(6,3)
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"abcdef"</span><span style="color: #0000FF;">)</span>
printf(1,"\n\n=>%c",ch)
<span style="color: #004080;">integer</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">ch</span><span style="color: #0000FF;">,</span><span style="color: #000000;">attr</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">get_screen_char</span><span style="color: #0000FF;">(</span><span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">)</span>
{} = wait_key()</lang>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n\n=&gt;%c"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">ch</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">{}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">wait_key</span><span style="color: #0000FF;">()</span>
<!--</syntaxhighlight>-->
{{out}}
<pre>
Line 131 ⟶ 426:
 
=>c
</pre>
 
=={{header|PowerShell}}==
This gets the character at position (3, 6) of the ''buffer'', not necessarily of the screen.
<syntaxhighlight lang="powershell">
$coord = [System.Management.Automation.Host.Coordinates]::new(3, 6)
$rect = [System.Management.Automation.Host.Rectangle]::new($coord, $coord)
$char = $Host.UI.RawUI.GetBufferContents($rect).Character
</syntaxhighlight>
 
=={{header|Python}}==
<syntaxhighlight lang="python">import curses
from random import randint
 
 
# Print random text in a 10x10 grid
stdscr = curses.initscr()
for rows in range(10):
line = ''.join([chr(randint(41, 90)) for i in range(10)])
stdscr.addstr(line + '\n')
 
# Read
icol = 3 - 1
irow = 6 - 1
ch = stdscr.instr(irow, icol, 1).decode(encoding="utf-8")
 
# Show result
stdscr.move(irow, icol + 10)
stdscr.addstr('Character at column 3, row 6 = ' + ch + '\n')
stdscr.getch()
 
curses.endwin()
</syntaxhighlight>
 
{{out}}
<pre>T@4;4G,XIJ
>C+PE0)RM;
JEV6B/8E?H
FSC>41UIGR
V>41JMXMOW
IY0*KH6M;B Character at column 3, row 6 = 0
-6<UL*>DU7
MZ))<5D:B8
.@UB/P6UQ)
<9HYH)<ZJF
</pre>
 
=={{header|Racket}}==
Works in a CMD box on Windows:
<langsyntaxhighlight lang="racket">
#lang racket
(require ffi/unsafe ffi/unsafe/define)
Line 146 ⟶ 486:
(and (ReadConsoleOutputCharacterA (GetStdHandle -11) b 1 #x50002)
(printf "The character at 3x6 is <~a>\n" b))
</syntaxhighlight>
</lang>
 
=={{header|Raku}}==
(formerly Perl 6)
{{trans|Python}}
<syntaxhighlight lang="raku" line>use NCurses;
 
# Reference:
# https://github.com/azawawi/perl6-ncurses
 
# Initialize curses window
my $win = initscr() or die "Failed to initialize ncurses\n";
 
# Print random text in a 10x10 grid
 
for ^10 { mvaddstr($_ , 0, (for ^10 {(41 .. 90).roll.chr}).join )};
 
# Read
 
my $icol = 3 - 1;
my $irow = 6 - 1;
 
my $ch = mvinch($irow,$icol);
 
# Show result
 
mvaddstr($irow, $icol+10, 'Character at column 3, row 6 = ' ~ $ch.chr);
 
mvaddstr( LINES() - 2, 2, "Press any key to exit..." );
 
# Refresh (this is needed)
nc_refresh;
 
# Wait for a keypress
getch;
 
# Cleanup
LEAVE {
delwin($win) if $win;
endwin;
}</syntaxhighlight>
 
{{out}}
<pre>
+W18:5I<1N
N-I.HG45SK
BFJY8:AK)8
J+4U<H1++:
RP>BX-/19Y
URDESVX;HX Character at column 3, row 6 = D
J7+X3@E<BG
M;?2U<8+FI
)@BG,:D)O1
)>A-=LDY-.
 
 
 
 
 
 
 
 
 
 
 
 
Press any key to exit...
</pre>
 
=={{header|REXX}}==
Line 152 ⟶ 559:
{{works with|PC/REXX}}
{{works with|Personal REXX}}
<langsyntaxhighlight lang="rexx">/*REXX program demonstrates reading a charcharacter from (at) at specific screen location. */
row = 6 row = 6 /*point to row six. /*point to a particular row on screen*/
col = 3 /*point to column" three. " " " column " " */
howMany = 1 /*read one character. /*read this many characters from screen*/
 
stuff = scrRead(row, col, howMany) /*this'll do it. */
 
other = scrRead(40, 63, 1) /*same thing, but for row forty. */
/*stick a fork in it, we're all done. */</langsyntaxhighlight><br><br>
 
=={{header|TXR}}==
<syntaxhighlight lang="txrlisp">;;; Type definitions and constants
 
(typedef BOOL (enum BOOL FALSE TRUE))
(typedef HANDLE cptr)
(typedef WCHAR wchar)
(typedef DWORD uint32)
(typedef WORD uint16)
(typedef SHORT short)
 
(typedef COORD
(struct COORD
(X SHORT)
(Y SHORT)))
 
(typedef SMALL_RECT
(struct SMALL_RECT
(Left SHORT)
(Top SHORT)
(Right SHORT)
(Bottom SHORT)))
 
(typedef CONSOLE_SCREEN_BUFFER_INFO
(struct CONSOLE_SCREEN_BUFFER_INFO
(dwSize COORD)
(dwCursorPosition COORD)
(wAttributes WORD)
(srWindow SMALL_RECT)
(dwMaximumWindowSize COORD)))
 
;;; Various constants
 
(defvarl STD_INPUT_HANDLE (- #x100000000 10))
(defvarl STD_OUTPUT_HANDLE (- #x100000000 11))
(defvarl STD_ERROR_HANDLE (- #x100000000 12))
 
(defvarl NULL cptr-null)
(defvarl INVALID_HANDLE_VALUE (cptr-int -1))
 
;;; Foreign Function Bindings
 
(with-dyn-lib "kernel32.dll"
(deffi GetStdHandle "GetStdHandle" HANDLE (DWORD))
(deffi GetConsoleScreenBufferInfo "GetConsoleScreenBufferInfo"
BOOL (HANDLE (ptr-out CONSOLE_SCREEN_BUFFER_INFO)))
(deffi ReadConsoleOutputCharacter "ReadConsoleOutputCharacterW"
BOOL (HANDLE (ptr-out (array 1 WCHAR))
DWORD COORD (ptr-out (array 1 DWORD)))))
 
;;; Now the character at <2, 5> -- column 3, row 6.
 
(let ((console-handle (GetStdHandle STD_OUTPUT_HANDLE)))
(when (equal console-handle INVALID_HANDLE_VALUE)
(error "couldn't get console handle"))
 
(let* ((cinfo (new CONSOLE_SCREEN_BUFFER_INFO))
(getinfo-ok (GetConsoleScreenBufferInfo console-handle cinfo))
(coord (if getinfo-ok
^#S(COORD X ,(+ 2 cinfo.srWindow.Left)
Y ,(+ 5 cinfo.srWindow.Top))
#S(COORD X 0 Y 0)))
(chars (vector 1))
(nread (vector 1))
(read-ok (ReadConsoleOutputCharacter console-handle chars
1 coord nread)))
(when (eq getinfo-ok 'FALSE)
(error "GetConsoleScreenBufferInfo failed"))
(prinl cinfo)
(when (eq read-ok 'FALSE)
(error "ReadConsoleOutputCharacter failed"))
(unless (plusp [nread 0])
(error "ReadConsoleOutputCharacter read zero characters"))
(format t "character is ~s\n" [chars 0])))</syntaxhighlight>
 
Notes:
* An <code>ptr-out</code> to an <code>array</code> of 1 <code>DWORD</code> is used for the number of characters out parameter. The FFI type <code>(ptr-out DWORD)</code> cannot work as a function argument, because integer objects are not mutable, and there isn't any concept of taking the address of a variable. A vector of 1 integer is mutable, and by making such a vector correspond with the FFI type <code>(array 1 DWORD)</code>, the necessary semantics is achieved.
* The quasiquote expression <code>^#S(COORD X ,(+ 2 cinfo.srWindow.Left) Y ,(+ 5 cinfo.srWindow.Top))</code> is equivalent to <code>(new COORD X (+ 2 cinfo.srWindow.Left) Y (+ 5 cinfo.srWindow.Top))</code>. It is done this way to demonstrate support for structure quasiquoting.
 
=={{header|Wren}}==
{{trans|Raku}}
{{libheader|ncurses}}
An embedded program so we can ask the C host to communicate with ncurses for us.
<syntaxhighlight lang="wren">/* Terminal_control_Positional_read.wren */
 
import "random" for Random
 
foreign class Window {
construct initscr() {}
 
foreign addstr(str)
 
foreign inch(y, x)
 
foreign move(y, x)
 
foreign refresh()
 
foreign getch()
 
foreign delwin()
}
 
class Ncurses {
foreign static endwin()
}
 
// initialize curses window
var win = Window.initscr()
if (win == 0) {
System.print("Failed to initialize ncurses.")
return
}
 
// print random text in a 10x10 grid
var rand = Random.new()
for (row in 0..9) {
var line = (0..9).map{ |d| String.fromByte(rand.int(41, 91)) }.join()
win.addstr(line + "\n")
}
 
// read
var col = 3 - 1
var row = 6 - 1
var ch = win.inch(row, col)
 
// show result
win.move(row, col + 10)
win.addstr("Character at column 3, row 6 = %(ch)")
win.move(11, 0)
win.addstr("Press any key to exit...")
 
// refresh
win.refresh()
 
// wait for a keypress
win.getch()
 
// clean-up
win.delwin()
Ncurses.endwin()</syntaxhighlight>
<br>
We now embed this in the following C program, compile and run it.
<syntaxhighlight lang="c">/* gcc Terminal_control_Positional_read.c -o Terminal_control_Positional_read -lncurses -lwren -lm */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ncurses.h>
#include "wren.h"
 
/* C <=> Wren interface functions */
 
void C_windowAllocate(WrenVM* vm) {
WINDOW** pwin = (WINDOW**)wrenSetSlotNewForeign(vm, 0, 0, sizeof(WINDOW*));
*pwin = initscr();
}
 
void C_addstr(WrenVM* vm) {
WINDOW* win = *(WINDOW**)wrenGetSlotForeign(vm, 0);
const char *str = wrenGetSlotString(vm, 1);
waddstr(win, str);
}
 
void C_inch(WrenVM* vm) {
WINDOW* win = *(WINDOW**)wrenGetSlotForeign(vm, 0);
int y = (int)wrenGetSlotDouble(vm, 1);
int x = (int)wrenGetSlotDouble(vm, 2);
char c = (char)mvwinch(win, y, x);
char s[2] = "\0";
sprintf(s, "%c", c);
wrenSetSlotString(vm, 0, s);
}
 
void C_move(WrenVM* vm) {
WINDOW* win = *(WINDOW**)wrenGetSlotForeign(vm, 0);
int y = (int)wrenGetSlotDouble(vm, 1);
int x = (int)wrenGetSlotDouble(vm, 2);
wmove(win, y, x);
}
 
void C_refresh(WrenVM* vm) {
WINDOW* win = *(WINDOW**)wrenGetSlotForeign(vm, 0);
wrefresh(win);
}
 
void C_getch(WrenVM* vm) {
WINDOW* win = *(WINDOW**)wrenGetSlotForeign(vm, 0);
wgetch(win);
}
 
void C_delwin(WrenVM* vm) {
WINDOW* win = *(WINDOW**)wrenGetSlotForeign(vm, 0);
delwin(win);
}
 
void C_endwin(WrenVM* vm) {
endwin();
}
 
WrenForeignClassMethods bindForeignClass(WrenVM* vm, const char* module, const char* className) {
WrenForeignClassMethods methods;
methods.allocate = NULL;
methods.finalize = NULL;
if (strcmp(module, "main") == 0) {
if (strcmp(className, "Window") == 0) {
methods.allocate = C_windowAllocate;
}
}
return methods;
}
 
WrenForeignMethodFn bindForeignMethod(
WrenVM* vm,
const char* module,
const char* className,
bool isStatic,
const char* signature) {
if (strcmp(module, "main") == 0) {
if (strcmp(className, "Window") == 0) {
if (!isStatic && strcmp(signature, "addstr(_)") == 0) return C_addstr;
if (!isStatic && strcmp(signature, "inch(_,_)") == 0) return C_inch;
if (!isStatic && strcmp(signature, "move(_,_)") == 0) return C_move;
if (!isStatic && strcmp(signature, "refresh()") == 0) return C_refresh;
if (!isStatic && strcmp(signature, "getch()") == 0) return C_getch;
if (!isStatic && strcmp(signature, "delwin()") == 0) return C_delwin;
} else if (strcmp(className, "Ncurses") == 0) {
if ( isStatic && strcmp(signature, "endwin()") == 0) return C_endwin;
}
}
return NULL;
}
 
static void writeFn(WrenVM* vm, const char* text) {
printf("%s", text);
}
 
void errorFn(WrenVM* vm, WrenErrorType errorType, const char* module, const int line, const char* msg) {
switch (errorType) {
case WREN_ERROR_COMPILE:
printf("[%s line %d] [Error] %s\n", module, line, msg);
break;
case WREN_ERROR_STACK_TRACE:
printf("[%s line %d] in %s\n", module, line, msg);
break;
case WREN_ERROR_RUNTIME:
printf("[Runtime Error] %s\n", msg);
break;
}
}
 
char *readFile(const char *fileName) {
FILE *f = fopen(fileName, "r");
fseek(f, 0, SEEK_END);
long fsize = ftell(f);
rewind(f);
char *script = malloc(fsize + 1);
fread(script, 1, fsize, f);
fclose(f);
script[fsize] = 0;
return script;
}
 
int main(int argc, char **argv) {
WrenConfiguration config;
wrenInitConfiguration(&config);
config.writeFn = &writeFn;
config.errorFn = &errorFn;
config.bindForeignClassFn = &bindForeignClass;
config.bindForeignMethodFn = &bindForeignMethod;
WrenVM* vm = wrenNewVM(&config);
const char* module = "main";
const char* fileName = "Terminal_control_Positional_read.wren";
char *script = readFile(fileName);
WrenInterpretResult result = wrenInterpret(vm, module, script);
switch (result) {
case WREN_RESULT_COMPILE_ERROR:
printf("Compile Error!\n");
break;
case WREN_RESULT_RUNTIME_ERROR:
printf("Runtime Error!\n");
break;
case WREN_RESULT_SUCCESS:
break;
}
wrenFreeVM(vm);
free(script);
return 0;
}</syntaxhighlight>
 
{{out}}
Sample output:
<pre>
86.Z=B>)0I
R/X,HX=6RE
>*12?I-G0+
D*8S-2A.)3
9)+=89UNXW
YQN4L8NC4W Character at column 3, row 6 = N
6EQC@=))B/
XWOSZ4/CR@
LU->=2@RW1
ZKFRC9EOT0
 
Press any key to exit...
</pre>
 
=={{header|XPL0}}==
<langsyntaxhighlight XPL0lang="xpl0">include c:\cxpl\stdlib;
int C;
[Cursor(3, 6); \move cursor to column 3, row 6 (top left = 0,0)
\Call BIOS interrupt routine to read character (& attribute) at cursor position
C:= CallInt($10, $0800, 0) & $00FF; \mask off attribute, leaving the character
]</langsyntaxhighlight>
 
{{omit from|ACL2}}
PureFox
9,476

edits

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