keyboard events in turbo c++

Kilgayne · #1 18-Jun-2004, 00:27

k i was trying to make a lil game in c++, everything seemed alright 'til i realized one major thing was missing : the keyboard input (omg). obviously the getch() and cin >> functions won't do i need a function that will return if a key is pressed and what it is. or sumthing like that. anyway i need something that will return the curent active key without pausing the game like getch() do. that's it, i need a getch() that won't pause the app...

is there anything in the basic header files of borland turbo c++ 3.idunno that could solve my prob? or if you could give me one with the function i need in it i would appreciate it as well.

...

btw, nice forum!

aaroncohn · #2 18-Jun-2004, 01:06

Spelling the word "something" with an 'o' instead of with a 'u' may not help you solve your input problem, but at least I'd be thinking about your situation instead of commenting on your massacre of the word "something."

machinated · #3 18-Jun-2004, 07:46

kbhit() returns true if a key gets hit. i think it's in conio.h

mithunjacob · #4 18-Jun-2004, 10:07

Quote:

Originally Posted by machinated

kbhit() returns true if a key gets hit. i think it's in conio.h

Yeah, kbhit()'s your answer..it can be used like this

Code:

while(!kbhit())
       switch(getch())
                {
                 case '2': GoUP();
                              break;
                 case '4': GoLT();
                              break;
                 case '6': GoRT();
                              break;
                 case '8': GoDN();
                              break;
                 case 27: Quit();
                }

This will force the programme into a continous loop until a key is encountered..modify it as per your own programme..it doesn't need to be a loop, you can have if(kbhit()) { switch(..... which will check, every time it encounters the if statement..

Kilgayne · #5 18-Jun-2004, 16:03

\o/ hey thanks guys, i've been searching it for months now!

...

i didnt know twas in conio... silly me.

Kilgayne · #6 19-Jun-2004, 20:38

erm... just one last thing about the input thingy...

i want my game to have like a fps rate so i use the "delay" function to reduce the speed of my app.. it works just fine when i don't hold a key down, but if i do, it starts beep-ing and the program freezes. it's not very convenient when we play a platform game. if i don't put that delay function in my prog., it wont beep and everything will be a-ok... but it won't run at the same speed on others pcs...

what can i do about it?

aaroncohn · #7 19-Jun-2004, 22:45

Hmm... I am not sure what reducing the speed of your app accomplishes... but generally, you'd want it to run at its optimal speed. Can't you ask the video card what the fps rate is? I don't know anything about graphics programming yet. You should teach me

WaltP · #8 20-Jun-2004, 02:12

Quote:

Originally Posted by Kilgayne

erm... just one last thing about the input thingy...

i want my game to have like a fps rate so i use the "delay" function to reduce the speed of my app.. it works just fine when i don't hold a key down, but if i do, it starts beep-ing and the program freezes. it's not very convenient when we play a platform game. if i don't put that delay function in my prog., it wont beep and everything will be a-ok... but it won't run at the same speed on others pcs...

what can i do about it?

Don't put the delay in by a command that pauses the game, but by computing the delay. A simple example:

CPP / C++ / C Code:

timeval = time() + 2;      // Wait for 2 seconds before proceeding
while (ch != EXIT_KEY)
{
    if (kbhit())
    {
        // process all keystrokes
    }
    if (time() > timeval)   // check if we should process
    {
        timeval = time() + 2;   // reset the pause value
         // process your game
    }
     else
    {
        // Not ready to process the game, just continue
    }
}

Kilgayne · #9 23-Jun-2004, 13:46

CPP / C++ / C Code:

if ((clock/TCK_CLK)>=(befclk+0.025))
{
    //fps=approx. 30-40
}

well i guess my problem is solved

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