riaz muhammad, MSc

#include <conio.h>
#include <stdio.h>
#include <windows.h>
#include <iostream>

/* definitions on what port is what base address depends, so use this */
#define LPT1     0x378
#define LPT2     0x278
#define LPT3     0x3BC

/* register offsets */
#define DATA     0
#define STATUS   1
#define CONTROLL 2

#define  BASE_ADDRESS   LPT1   /* this is the address we use (modify here if you need to) */

typedef short _stdcall (*INP32)(short PortAddress);
typedef void  _stdcall (*OUT32)(short PortAddress, short Data);
using namespace std;

int main(void) {

    short     value;
        
    HINSTANCE hLib;
    INP32     Inp32;
    OUT32     Out32;
     
/******************** LIBRARY INIT ***********************/
     
    if ((hLib = LoadLibrary("inpout32.dll")) == NULL) {
        printf("Unable to load inpout32.dll, did you copy it to the system folder?\n");
        return 0;
    }
    
    if ((Inp32 = (INP32)GetProcAddress(hLib, "Inp32")) == NULL) {
        printf("Unable to establish handle to input function.\n");
        return 0;
    }
    
    if ((Out32 = (OUT32)GetProcAddress(hLib, "Out32")) == NULL) {
        printf("Unable to establish handle to output function.\n");
        return 0;
    }


/*********************** MAIN CODE **************************/
     //do while (tf != 3) {
     int tf;
     cout << "Please indicate to clear or activate the leds. 0 for clear, 1 for activate. 3 to exit.\n";
     cin >> tf;
     
     if (tf = 0) {                                            
                 //  Write to the data register 
                 printf("You typed 0");
                 value = 0x00;
                 printf("Writing 0x%2X to port 0x%X...\n" ,value ,BASE_ADDRESS  );
                 Out32( BASE_ADDRESS , value );

                 // Read it back 
                 value = Inp32(BASE_ADDRESS);
                 printf("\n(Reading) Port %04X = %04X\n", BASE_ADDRESS, value);
     }
     
     if (tf = 1) {
                 //  Now use a different value 
                 printf("You hit 1");
                 value = 0xff;
                 printf("\nWriting 0x%2X to port 0x%X...\n" ,value ,BASE_ADDRESS  );
                 Out32(BASE_ADDRESS, value);
     
                 // Read it back  
                 value = Inp32(BASE_ADDRESS);
                 printf("\n(Reading) Port %04X = %04X\n\n", BASE_ADDRESS, value);
     }
    //}

 /******************** CLEANUP ******************************/

     // GO FREEE LITTLE LIBRARIES!, GO FREEEEE!!!
     FreeLibrary(hLib);

     // were done.
     printf("Press any key to exit.\n");
     getch();

     return 1;
}