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DOES ANY BODY KNOW HOW TO DETECT A KEYSTROKE IN C++ AND DETERMINE WHAT KEY WAS PRESSED??? OR BASICLY A "cin >>" WHERE YOU DON'T HAVE TO PRESS <enter> AT THE END OF THE INPUT.
Im trying to make an interactive menu where you can press the up or down keys to select an item.
Example:cout<<"New Game<- \nOptions";
onKeyPress("enter"){
startGame();//open this function
}
onKeyPress("down"){
system("CLS"); //clear screen
cout<<"New Game \nOptions<-";
onKeyPress("enter"){
setOptions();//open this function
}
}so users don't have to press enter to select an option:
int a;
cout<<"New Game = 1\nOptions = 2\n";
cin >>a;
swich (a){
case 1:
startGame();
case 2:
setOptions();
default:
cout<<"\nERROR!";
}can somebody post an example or some helpfull links?
Thanks,
Jake
cin is designed for buffered input. If your compiler has it, look for the non-standard function getch... usually included with conio.h
unsigned key;
do{
key = getch();
switch(key){...}}while(some condition);
0 
Jake:
This code will capture and show any
combination of keys in ascii or special
keys (like CTRL+A and so on) without
pressing <enter>.int main(int argc, char **argv)
{/*
press "q" (lower case letter only)
to quit */
*/unsigned int key;
do
{
key = getch();
printf("key = %d\n", key);
}
while(key != 'q');
return 0;}
MYXP
0
Thanks for the examples, but they don't work the way I expected them to. You still have to hit enter after you press a key. It may be my compiler. I use Bloodshed Dev-C++ 4.0. If you don't have to hit enter after you press a key, tell me what compiler you use.
Thanks,
Jake
0
In myxp's example, you can add an additional call to getch(e). If the outer call is 0, then you've got extended keys, so trap the inner call for the special keys. ie: arrows, function keys, etc.
Try getche() in Dev C. However it will output the character, so call putch('\x8'); after it if you wish not to have an echo.
HTH
0
Ronin1:
Thanks for the reply, but I am kinda new to C++. Can you give me an example of how this might work? Where do you place "putch('\x8');"? And not to sound rude, but what do you mean by "outer call is 0"? Is this some var I have to set - or the number I put petween the parenthesis? I'm kinda confused, so bear with me.Thanks in advance,
Jake
0
Don't worry about rudeness. If you cross the line, then I won't reply. :P
unsigned key1, key2;
do
{
key1 = getche(); // outer test
putch('\x8'); // put backspace charif(key1 == 0) // means that a special key was pressed
{
key2 = getche(); // inner
putch('\x8');switch(key2)
{
case 72: /* up arrow */ break;
...
}// end switch
}//end if
}while(key1 != 27); // esc key pressed?You need to be careful with getch in OSes like XP, NT, or 2K since they emulate console output. They can go nuts.
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