Error:Unhandled exception while compiling the program

Question

hi,

here in this below simple program am trying to compile and which giving an unhandled exception.want to know whether the _outp(),_inp() functions will work for windowsxp operating system.If so,then why am getting the unhandled exception.I would like to check the low and high on the particular pins of parallel port from C program.could u please give me an example to do this way of interfacing with the parallel port in C.

include "stdafx.h"
#define PORT1 0x378

int _inp(unsigned short port);
int _outp( unsigned short port, int databyte );

int main () {

 int val = 0;
 short result;

 while ( val < 256) {

   printf("Enter a value in decimal (256 to quit)>");
   scanf("%d", &val);
 

   //_outp(PORT1, val);
   result=_inp(PORT1);
   printf("the result value:%d",result);
 
 }

 _outp(PORT1, 0);

return 0;
}

 

I checked the outportb(); function which doesnot allow at all.compiler am using is visual studio 2008.kindly suggest any tutorial links to learn the complete parallel port interfacing in C or C++

 

Answer 1

keerth516 wrote:

want to know whether the _outp(),_inp() functions will work for  windowsxp operating system.

No they won't. User-space programs aren't allowed direct access to I/O  ports. You need a kernel-mode device driver for that.

kindly suggest any tutorial
links to learn the complete parallel port interfacing in C or C++

http://logix4u.net/parallel-port/16-inpout32dll-for-windows-982000ntxp

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Igor Tandetnik