hello,everybody. This is a tiny game.It is like a Andre Lamothe's sample.I wrote it in Turbo C 2.0. But it does not work well.The ball can't move itself.Only while i hit the key,the ball just move a little. I think the problem is the key buffer and the function key().But im a newbie. I don't know how to use DPMI or EMS.can it work in DOS real mode? What can i do? Thanks for anyone. After is the game's src: #include <stdlib.h> #include <graphics.h> #include <bios.h> /*---------------------------Defines---------------------------------------*/ #define SCREEN_HEIGHT 480 /*Define the screen.-----------*/ #define SCREEN_WIDTH 640 #define BALL_START_X random(30) /*Define the ball--------------*/ #define BALL_START_Y random(40) /*Define the pannel.-----------*/ #define PANNEL_START_X (SCREEN_WIDTH/2 - 16) #define PANNEL_START_Y (SCREEN_HEIGHT -32) #define PANNEL_WIDTH 64 #define PANNEL_HEIGHT 16 #define KEY_ESC 27 /*Define the key map-----------*/ #define KEY_LEFT 75 #define KEY_RIGHT 77 #define KEY_L 108 #define KEY_H 104 #define GAME_STATE_INIT 0 /*Define the game's state.-----*/ #define GAME_STATE_START_LEVEL 1 #define GAME_STATE_RUN 2 #define GAME_STATE_SHUTDOWN 3 #define GAME_STATE_EXIT 4 /*-------------------------End define--------------------------------------*/ /*---------------------------Game console----------------------------------*/ int Gema_main(void); int key(void); /*----------------------------Globals--------------------------------------*/ int ball_x = 0, ball_y = 0; int ball_dx = 0, /*velocity of the ball----*/ ball_dy = 0; int pannel_x1 = 0, pannel_y1 = 0, pannel_x2 = 0, pannel_y2 = 0; int score = 0; /*the origin score.--------*/ int get_key = 0; int gdriver=DETECT, gmode; int game_state = GAME_STATE_INIT; /*-------------------------------main--------------------------------------*/ int main(void) { ball_dx+=random(2); ball_dy+=random(4); while((get_key = key()) != KEY_ESC){ Game_main(); } return 1; } /*-----------------------------End main------------------------------------*/ /*-----------------------process the ball---------------------------------*/ void process_ball(void) { cleardevice(); /*-------------Test if the ball hit the pannel----------------------------*/ if((ball_x >= pannel_x1 && ball_x <= pannel_x2) && (ball_y >= pannel_y1 && ball_y <= pannel_y2)) { ball_dy = -ball_dy; ball_y += ball_dy; if ( get_key == KEY_RIGHT || get_key == KEY_L) { ball_dx -= random(3); ball_dy -= random(3); } else if ( get_key == KEY_LEFT || get_key == KEY_H) { ball_dx += random(3); ball_dy += random(3); } else ball_dx += -1 + random(3); circle(ball_x,ball_y,30); return; } ball_x+=ball_dx; ball_y+=ball_dy; } /*End process_ball*/ /*Get key map.*/ int key() { int key; while((bioskey(1) == 0)){ key = bioskey(0); key = key & 0xff ? key & 0xff : key >> 8; return (key); } }/*End get keymap*/ /*--------------------------Game main--------------------------------------*/ int Game_main(void) { if (game_state == GAME_STATE_INIT) { initgraph(&gdriver,&gmode,"e:\\soft\\tc2"); /*goto the graphic mode*/ pannel_x1 = PANNEL_START_X; pannel_y1 = PANNEL_START_Y; pannel_x2 = pannel_x1 + PANNEL_WIDTH; pannel_y2 = pannel_y1 + PANNEL_HEIGHT; ball_x = 8 +random(SCREEN_WIDTH-16); ball_y = BALL_START_Y; ball_dx = 4 + random(8); ball_dy = 6 + random(1); } game_state = GAME_STATE_RUN; if (game_state == GAME_STATE_RUN) { cleardevice(); setcolor(GREEN); rectangle(pannel_x1,pannel_y1, pannel_x2,pannel_y2); /*-------------------Move the pannel,and keep in the screen.---------------*/ if (get_key == KEY_RIGHT || get_key == KEY_L) { pannel_x1+=8; pannel_x2 = pannel_x1 + PANNEL_WIDTH; if (pannel_x2 > (SCREEN_WIDTH)) pannel_x1 = SCREEN_WIDTH - PANNEL_WIDTH; } if (get_key == KEY_LEFT || get_key == KEY_H) { pannel_x1-=8; pannel_x2 = pannel_x1 + PANNEL_WIDTH; if (pannel_x1 < 0) pannel_x1 = 0; } /*---------------Test if the ball hit my screen.--------------------------*/ if (ball_x > (SCREEN_WIDTH) || ball_x < 0) { ball_dx = -ball_dx; ball_x +=ball_dx; score -= 50; } if(ball_y > (SCREEN_HEIGHT) || ball_y < 0) { ball_dy = -ball_dy; ball_y += ball_dy; score -= 50; } if (ball_dx > 8) ball_dx = 8; /*contorl the ball's velocity*/ else if (ball_dx < -8) ball_dx = 8; process_ball(); rectangle(pannel_x1,pannel_y1, /*Draw the pannel*/ pannel_x2,pannel_y2); circle(ball_x,ball_y,6); /*Draw the ball*/ /*-----------------Exit the game.----------------------------------------*/ if (get_key == KEY_ESC) { game_state = GAME_STATE_SHUTDOWN; } } else if (game_state == GAME_STATE_SHUTDOWN) { closegraph(); game_state = GAME_STATE_EXIT; } return (1); } [edited by - longlong_0 on March 12, 2003 4:44:38 AM]

I never coded C++, so I don''t know if I can help you, but the
problem sounds like the ball is ''waiting'' for keyboard input.

So I would recommend making a new really short program to find out how those keyboard commands work.
Some DOS-based keyboard commands will pause your program until any keypress has occured.
So use the short program to find out exactly what each keyboard instruction does. I''m convinced the C language offers a routine which will just tell you what key is pressed or return 0 if nothing happend and continue the program.

Good Luck, NewBe

quote:Original post by Xanth
Ok, try changing your key function to...

int key() {

int key;

if(kbhit()) {
key = getch();
return (key);
} else {
return -1;
}

}

And change your main loop to...

while(1) {
get_key = key();
if(get_key == KEY_ESC) break;

Game_main();
}

I think that should help things.


[edited by - Xanth on March 12, 2003 2:59:41 PM]

thank for your help.
i have solved the problem.
there are many things i will do .
thanks