LPT unter XP-vista

#include <stdio.h>

#include <stdlib.h>

#include <conio.h>

#include <windows.h>

/* Definitions in the build of inpout32.dll are:            */

/*   short _stdcall Inp32(short PortAddress);               */

/*   void _stdcall Out32(short PortAddress, short data);    */

/* prototype (function typedef) for DLL function Inp32: */

     typedef short (_stdcall *inpfuncPtr)(short portaddr);

     typedef void (_stdcall *oupfuncPtr)(short portaddr, short datum);

#define PPORT_BASE 0x378

void test_write(void);

void test_read_control(void);

/* After successful initialization, these 2 variables

   will contain function pointers.

 */

     inpfuncPtr inp32fp;

     oupfuncPtr oup32fp;

/* Wrapper functions for the function pointers

    - call these functions to perform I/O.

 */

     short  Inp32 (short portaddr)

     {

          return (inp32fp)(portaddr);

     }

     void  Out32 (short portaddr, short datum)

     {

          (oup32fp)(portaddr,datum);

     } 

int main(void)

{

     HINSTANCE hLib;

     short x;

     int i;

     /* Load the library */

     hLib = LoadLibrary("inpout32.dll");

     if (hLib == NULL) {

          fprintf(stderr,"LoadLibrary Failed.\n");

          return -1;

     }

     /* get the address of the function */

     inp32fp = (inpfuncPtr) GetProcAddress(hLib, "Inp32");

     if (inp32fp == NULL) {

          fprintf(stderr,"GetProcAddress for Inp32 Failed.\n");

          return -1;

     }

     oup32fp = (oupfuncPtr) GetProcAddress(hLib, "Out32");

     if (oup32fp == NULL) {

          fprintf(stderr,"GetProcAddress for Oup32 Failed.\n");

          return -1;

     }

/*******************************************************/

/** IF WE REACHED HERE, INITIALIZED SUCCESSFUL    ******/

/*******************************************************/

     //test_read_control();

     test_write();

     //test_read_control();

     /* finished - unload library and exit */

     FreeLibrary(hLib);

     //system("pause");

     return 0;

}

//   TEST:  Write constant to Control register)

void test_write(void) {

     short x;

     int i;

     Out32(0x37A,0xCA);     // Set Output-only again

}

//   TEST:  READ data from control

void test_read_control(void) {

     short x;

     int i;

     i=0x37A;

     x = 12;

     x = Inp32(i);

     printf("Port read (%04X)= %04X\n",i,x);

}