accsesing the paralell port in c++

i am writing c ode for a college project i'm using dev c++

what i was wondering is, how would you go about doing it using dev c++

i managed to do it using microsoft visual c++ using

Code:

---



#include <iostream.h>
#include<io.h>
#include<windows.h>




#define DATA 0x378
#define STATUS 0x379
#define CONTROL 0x37a

---

and this in main

Code:

---



HANDLE h;
h = CreateFile("\\\\.\\giveio", GENERIC_READ, 0, NULL, OPEN_ EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE) {
printf("Couldn't accses giveio device\n");
}
CloseHandel(h);

---

but help 'cause

Code:

---


_outp(int addres,value);

_inp(addres);

---

aren't working


thanks kindly ;)

_inp and _outp are most likely failing because they compile to assembly instructions that only the OS is allowed to use, and your program is running in userspace. With the VC++ code, you used OS services to send the data to the 'raw' device, which makes it allowable.

I'm not a hardware expert, but that's the likely issue.

Dovel, why are you using that stupid compiler?? only joking. It works on visual, so I don't see what's wrong with using that. (your laptop doesn't have a parallel port ... ) ask richie, it's something about conio.h not being standardised

I've never actually done it... but I've done a tiny bit of research on the subject. Maybe you can find something on this site.

You might post your question on the Windows forum too. This is a platform-specific issue, and there's probably someone there who knows the secret! <<< EDIT- ...Or, maybe not. I just did a quick search, and all I found was a suggestion to use CreateFile() with no details... Maybe you can find the details of how to use CreateFile() for an I/O port on MSDN ???? >>>

I think you can open the port using file I/O commands, but I don't know the details.

Stuka is right. Windows NT, 2K, or XP prevents a user mode program from directly accessing an I/O or memory address. A kernel mode (driver) program can do it, but writing drivers is an advanced topic.

I once wrote a program to make sounds by writing to the internal speaker's hardware. It works on Win98, but I get some sort of "access violation" error when I run the program on a modern Windows system. If all else fails, can you use Win98 for your project?

Once you find the solution, it should work on Dev-C++ or Windows... The standard WinAPI functions should work in Dev-C++.