Getch() Problem: C vs D

[LouisHK via Digitalmars-d-learn]

Hello, I minimize the problem to identify the problem:
Here the C version:

#include <stdio.h>
int main(){
   int c;
   while(c != 27){
       printf("%d\n", (c = getch()));
   }
   return 0;
}

And works fine, but the D version below nothing happens when I 
hit ESCAPE:

import std.stdio;
extern (C) int getch();
int main(){
   int c;
   while(c != 27){
       printf("%d\n", (c = getch()));
   }
   return 0;
}

Is this a bug or there is another approach?

Thanks,

L.