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Article View: comp.os.msdos.programmer
Article #1444

int 9h

#1444
From: "John E. Davis"
Date: Fri, 11 Sep 1992 16:56
44 lines
1694 bytes
Hi,

   I need  to know how to do something very simple:  intercept interrupt 9
(keyboard ready), set a flag if a certain key was pressed otherwise call the
old interrupt nine handler.  I know how to do everything, EXCEPT reading the
key directly from the keyboard.  So I have: (BCC++ 3.0)

void interrupt (*oldint9)();
extern volatile int KeyBoard_Flag;
extern int Interrupt_Char;         /* probably a scan code needed */

void init_int9_handler(void)
{
     oldint9 = getvect(9);
     setvect(9, int9_handler);
}
  
void restore_int9_handler(void)
{
     setvect(9, oldint9);
}

void interrupt int9_handler(void)
{
     if (/* peek at key from keyboard */ == Interrupt_Char)
       KeyBoard_Flag = 1;
     else
       (*oldint9)();
}

	  
In the last routine, I need to know how to complete the if statement.

Any comments or suggestions will be greatly appreciated.

Thanks,
--
     _____________
#___/John E. Davis\_________________________________________________________
#
# internet: davis@amy.tch.harvard.edu
#   bitnet: davis@ohstpy
#   office: 617-735-6746
#
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From: davis@pacific.mps.ohio-state.edu ("John E. Davis")
Subject: int 9h
Message-ID: <DAVIS.92Sep11115609@pacific.mps.ohio-state.edu>
Sender: news@pacific.mps.ohio-state.edu
Nntp-Posting-Host: pacific.mps.ohio-state.edu
Reply-To: davis@pacific.mps.ohio-state.edu  (John E. Davis)
Organization: "Dept. of Physics, The Ohio State University"
Date: Fri, 11 Sep 1992 16:56:09 GMT
Lines: 44