Output to LPT1

[Barbusix]

HELLO Everyone!
I am novice in programing in dev C++,
and allready have a problem.
I am trying to send a signal as a bit in output to parallel port!
Here is the code

#include <conio.h>
#include <stdio.h>
int _outp( short port, int databyte);
int main()
{
int inval = 0 ;
while (inval < 256 )
{
printf( " Enter number beetween 0 and 256 ");
scanf("%d", &inval);
_outp(0x378, inval);
}
_outp(0x378, 0 );
return 0 ;
}

Here is the message what compiler says:
linker error , undefined reference to `_outp(short int)`
Help please?

[weaknessforcats]

The linker can't find the code for this function:

int _outp( short port, int databyte);
 

[Barbusix]

[quote=weaknessforcats]The linker can't find the code for this function:
[code]
int _outp( short port, int databyte);

what to do then with linker?

[weaknessforcats]

Locate the code for that function. If it's in a library then add the library to your make file so the linker can search it.

The documentation for the functon should a) identify the header file to use and b) the library name to add to the makefile. If you wrote thios function, then add the soruce file with the funciton definition to your make file.

[newb16]

First of all check that your OS supports ( unlike, e.g., win XP ) direct write to io port. If not, search for the driver first.

[weaknessforcats]

_outp is in libc.lib. Is that library in your build?