key.c

编程序的一些规范和例题

/*
 * key.c 		                                    Ver 0.0
 *
 * (c) Copyright ChangHong NetWork Co. Ltd, MianYang PRC, 2004.8.19
 *
 * Source file name : key.c
 * Author	    : Robert ChengZhiJun  ( [e-mail] )
 *
 * Original Work    : none
 *
 * Introduction     :
 *      This file is to encapsulate the KEY press function!
 *	
 * =======================
 * IMPROVEMENTS THOUGHT OF
 * =======================
 *
 * =====================
 * MODIFICATION HISTORY
 * =====================
 *
 * Date        Initials        Modification
 * ----        --------	       ------------
 * 
 * 
 */



/*
 * define the keys
 */
 #define      MUTE_KEY         0x18
 #define      I_FRAME_KEY      0x20
 


/*
 * read char on the keyboard of the computer, return 16 bit scan code
 */
typedef enum
{
    CURSOR_OFF,
    CURSOR_ON
} cursor_state_t;

int ReadKey ( cursor_state_t cursorStatus, clock_t tclkWaitTime )
{
  union REGS rg;
  
  cursorStatus = CURSOR_OFF; /*no use for Turbo C, adding this for no warning when compiling this program*/	
  tclkWaitTime = 0;          /*no use for Turbo C, adding this for no warning when compiling this program*/	  
  rg.h.ah      = 0;
  int86 ( 0x16, &rg, &rg );
  
  /*
   * czj040823 for TURBO C
   */
  #if 1
      #if 0
          printf ( " rg.h.ah1 = %d \n", rg.h.ah );
      #endif
      switch ( rg.h.ah )
      {
         /*czj040823 just for MUTE_KEY :: 'U' or 'u'*/
         case 22:
              rg.h.ah = MUTE_KEY;
              break;
         
         /*czj040823 just for I_FRAME_KEY :: 'F' or 'f'*/
         case 33:
              rg.h.ah = I_FRAME_KEY;
              break;
         
         default:
              break;
      } 
  #endif
  
  return rg.h.ah;
}