Hello
I am having trouble figuring out why the _getch() function read some extended keys as printable chars. I wrote a function that read chars from the keyboard and store them in a string variable. The user can use backspace to delete a character and the enter key to end input and return the string.
I taught that everything was fine until i accidentally press one of the Left Arrow keys and the letter 'K' was displayed. I explored further and found that other extended keys displayed printable chars:
Left Arrow: K, Right Arrow: M, Up Arrow: H, Down Arrow: P
PrtScn: R, Home: G, End: O, Delete: S
PgUp: I, PgDn: Q
If anyone can help me figure this out, i would appreciate it.
Thanks
Here is a code snippet of the function:
Code:
void getString( char * buffer, int size )
{
const int Max = size - 1 ;
char return = '\r' ;
char backspace = '\b' ;
while (( Ch = _getch() ) != return )
{
if (Ch == 0 ) {
// ignore extended keys
Ch = _getch() ;
}
else if ( Ch == backspace ) {
// remove char at end, update string
}
else if ( ( Ch >= 32 ) && ( Ch <= 122) ) {
if ( strlen( buffer) < Max ) {
// echo char and add it to buffer
}
}
} // end while
} // end function
I
problem with _getch
