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Reading char from stdin without waiting for input
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Posting Whiz in Training
I'm seeing if it is possible to write a pong game only using standard C with maximum portability. I've worked out everything except user input. When the game is playing, If the user has no key pressed down, the paddle does not move but the ball should keep moving. I can only think of two way's of doing this. One is to get the user to hold down an extra key at all times. The other is to shut off the buffer on stdin using setvbuf(), which will hopefully make getchar() return EOF or NULL when no key is being pressed. Would these work? Does anyone have any other idea's?
Thanks.
Thanks.
"Sometimes, when I lie in bed at night and look up at the stars, I think to myself, "Man! I really need to fix that roof."-Jack Handy
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Posting Whiz in Training
I think you would have to look at the ncurses library .. or the pdcurses library for the Window's equivalent to avoid any platform specific requirements.
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Originally Posted by yellowSnow 
I think you would have to look at the ncurses library .. or the pdcurses library for the Window's equivalent to avoid any platform specific requirements.
I want to see what can be done with standard C alone. "Sometimes, when I lie in bed at night and look up at the stars, I think to myself, "Man! I really need to fix that roof."-Jack Handy
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Originally Posted by Hiroshe
That would be cheating.
http://c-faq.com/osdep/cbreak.html
Last edited by Dave Sinkula; Aug 2nd, 2009 at 3:07 pm.
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Junior Poster in Training
I also had the same problem in past,
I think, if you are using Turbo C, under <dos.h>, there is a function called kbhit(), checks keyboard hit.
I think, if you are using Turbo C, under <dos.h>, there is a function called kbhit(), checks keyboard hit.
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Last edited by deepugtm; Aug 2nd, 2009 at 3:34 pm.
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kbhit() function is in conio.h library and conio.h is not a standard library which is not what Hiroshe want
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Is it standard behaviour for a key just pressed to outpower a key being held down? ie. The user holds down the space bar for the whole game, and the "up" key out powers the spacebar? If not, than I guess I'll have a theird key for "stay still".
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Originally Posted by Hiroshe
Is it standard behaviour for a key just pressed to outpower a key being held down? ie. The user holds down the space bar for the whole game, and the "up" key out powers the spacebar? If not, than I guess I'll have a theird key for "stay still".
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Originally Posted by Dave Sinkula
Prepare to be disappointed.
http://c-faq.com/osdep/cbreak.html
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Only when the user is satisfied and presses the RETURN key (or equivalent) is the line made available to the calling program.
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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Hmm... Then I guess the best I can do in standard C is to pause the game and get the user input (up, down, still) befor continuing on.
I'm too stubborn. Maybe instead of the space bar, get the user to hold down return. Just write an input function that ignores '\n'. That way the stream continuously updates. Would this work? I'll try it at home.
I'm too stubborn.
Maybe instead of the space bar, get the user to hold down return. Just write an input function that ignores '\n'. That way the stream continuously updates. Would this work? I'll try it at home. "Sometimes, when I lie in bed at night and look up at the stars, I think to myself, "Man! I really need to fix that roof."-Jack Handy
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Posting Whiz in Training
Nope, It didn't work. When I hold down return and press a character, it wait's for the another return. Thanks for helping.
"Sometimes, when I lie in bed at night and look up at the stars, I think to myself, "Man! I really need to fix that roof."-Jack Handy
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