peekb

Returns the byte of memory specified by segmentoffset.

Defined in header <dos.h>

Syntax

#include <dos.h>
char peekb(unsigned  segment, unsigned offset);

Portability

Remarks

peekb returns the byte at the memory location addressed by segmentxffset.

If peekb is called when dos.h has been included, it is treated as a macro that expands to inline code. If you don't include dos.h, or if you do include it and #undef peekb, you'll get the function rather than the macro.

Return value

peekb returns the byte of information stored at the memory location segmentioffset.

See also

• peek
• pokeb

Example

#include <stdio.h>
#include <conio.h>
#include <dos.h>
int main(void)

   int value = 0;
   printfC'The current  status of your keyboard is:\n");
   value = peekb(0x0040,  0x0017);
   if (value & 1)
      printf "Right shift  on\n");
   else
      printf "Right shift  off\n");
   if (value & 2)
      printf "Left shift  on\n");
   else
      printf "Left shift  off\n");
   if (value & 4)
      printf "Control  key on\n");
   else
      printf "Control  key off\n");
   if (value & 8)
      printf "Alt key  on\n");
   else
      printf "Alt key  off\n");
   if (value & 16)
      printf "Scroll  lock on\n");
   else
      printf "Scroll  lock off\n");
   if (value & 32)
      printf "Num  lock on\n");
   else
      printf  "Num lock off\n");
if (value & 64)
   printfC'Caps  lock on\n");
else
   printfC'Caps lock  off\n");
return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

• Microsoft C runtime (search)

These are search links, not yet checked by hand.

Stable link: /3.1/dos.h/peekb/ · short form /3.1/peekb/