Single keypress using getche() or getchar()

[Nobody/Anonymous]

Single keypress using C++ getche(), getch() or cin.get() and C getchar() all work fine if coded in the function main().  However, if they are coded in a user defined function then in addition to pressing a key, the return key has to be pressed. 
Any ideas?

Tony

[Nobody/Anonymous]

Tony,
You must be doing something wrong. I cannot figure out what it might be, but I am currently developing a game, and I use getch() nearly all the time...
Give a little more info, preferably some code.
Yours sincerely,
Peter.
TDLGames Programmer.
Visit our website at
http://www.tdlgames.com

[Nobody/Anonymous]

Peter

I have been trying various things but still cannot get it to work.  In fact getch() causes an implicit declaration error.  I am using version 4 as version 5 seems to be in various stages of beta.  The code below works correctly using Borland 4.52 I simply need to press the appropriate key, but I have to press the return key with Dev-CPP in both the functions main() and getKey().

Many thanks
Tony

#include<iostream.h>
#include<conio.h>

//function to get a single character
char getKey();

void main()
{//start of function main
  char whichKey;

  whichKey=getKey();
  clrscr();
  cout<<"The key pressed was "<<whichKey;
  cout<<"\n\nPress any key... ";

  cin.ignore();
  whichKey=getche();
}//end of function main

/***************************************************\
The function getKey validates for values A, B, C, D
\***************************************************/
char getKey()
{//start of function getKey
  char keyPressed;
  clrscr();

  do
  {//start of do loop
    cout<<"Press a key between A..D ";
    keyPressed=getche();
    if(keyPressed>'D')
      keyPressed-=32;
  }while(keyPressed<'A'||keyPressed>'D');
  //keep looping until a valid key is pressed

  return keyPressed;
}//end of function getKey

[Nobody/Anonymous]

Tony,
I have tried to fix your problem.
I include the code at the bottom of this post. I made a few minimal changes to the code.
Also please note that both clrscr() and getch() are Borland specific functions, although GCC supports them.
I hope this helps you.
Yours sincerely,
Peter.
TDLGames Programmer.
Visit our website at
http://www.tdlgames.com
[Code]
#include<iostream>
#include<conio.h>
using namespace std;
//function to get a single character
char getKey();

int main()
{//start of function main
char whichKey;

whichKey=getKey();
system("cls");
cout<<"The key pressed was "<<whichKey;
cout<<"\n\nPress any key... ";

// cin.ignore();
whichKey=getche();
}//end of function main

/***************************************************\
The function getKey validates for values A, B, C, D
\***************************************************/
char getKey()
{//start of function getKey
char keyPressed;
system("cls");

do
{//start of do loop
cout<<"Press a key between A..D ";
keyPressed=getche();
if(keyPressed>'D')
keyPressed-=32;
}while(keyPressed<'A'||keyPressed>'D');
//keep looping until a valid key is pressed

return keyPressed;
}//end of function getKey
[/Code]

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