Thread: inpout32.dll function help

Hallo

I am having trouble with a small piece of code that I have downloaded from the internet. The code is the example program for "inpout32.dll"

The thing I am trying to find out is how to use following commands in an other project.

Code:

short _stdcall Inp32(short PortAddress);
void _stdcall Out32(short PortAddress, short data);

The project is for VC++, but I would prefer to work in dev-cpp. Is that possible without recompiling a whole lot of stuff?

Here is the rest of the code:

Code:

// InpoutTest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include <iostream>
/* ----Prototypes of Inp and Outp--- */

short _stdcall Inp32(short PortAddress);
void _stdcall Out32(short PortAddress, short data);

/*--------------------------------*/

int main(int argc, char* argv[])
{

	int data;

	if(argc<3)
	{
		//too few command line arguments, show usage
		printf("Error : too few arguments\n\n***** Usage *****\n\nInpoutTest read <ADDRESS> \nor \nInpoutTest write <ADDRESS> <DATA>\n\n\n\n\n");
	} 
	else if(!strcmp(argv[1],"read"))
	{

		data = Inp32(atoi(argv[2]));

		printf("Data read from address %s is %d \n\n\n\n",argv[2],data);
	
	}
	else if(!strcmp(argv[1],"write"))
	{
		if(argc<4)
		{
			printf("Error in arguments supplied");
			printf("\n***** Usage *****\n\nInpoutTest read <ADDRESS> \nor \nInpoutTest write <ADDRESS> <DATA>\n\n\n\n\n");
		}
		else
		{
		Out32(atoi(argv[2]),atoi(argv[3]));
		printf("data written to %s\n\n\n",argv[2]);
		}
	}

    int stuff;
	std::cin >> stuff;
	return 0;
}

Thank you for your time

What exactly is the problem you are having, you don't say in your post? [It's quote common to know what you yourself is talking about, but others don't!]

--
Mats

What exactly is the problem you are having, you don't say in your post? [It's quote common to know what you yourself is talking about, but others don't!]

That why they try to force you to re-read your own essays from when you learn to write utile you die. Sorry for that.

I am going to use the .dll file on a older computer without VC++, so is there some way to make that code work in dev-cpp? I only need the Inp32/Out32 functions.
When I try to compile it in de-cpp right now I get "unknown reference to 0576363@23"

(Dont remember to exact number now, sorry)

Hope it makes more sense now, time for bed soon

If all you want to do is some simpl IN/OUT instructions, it seems completely overkill to link with a DLL. I found this snipped about linking with DLL's. http://www.cygwin.com/cygwin-ug-net/dll.html

How about using (unportable) inline assembler instead? Something like this:

Code:

typedef unsigned char byte;
typedef unsigned short word;
typedef unsigned long dword;

byte inb(word port) {
    byte res;
    __asm__ __volatile__("in %dx,%al": "=a"(res):"d"(port));
   return res;
}

word inw(word port) {
    word res;
    __asm__ __volatile__("in %dx,%ax": "=a"(res):"d"(port));
   return res;
}

word inl(word port) {
    word res;
    __asm__ __volatile__("in %dx,%eax": "=a"(res):"d"(port));
   return res;
}

void outb(word port, byte val) {
    __asm__ __volatile__("out %al,%dx"::"a" (val), "d"(port));
}

void outw(word port, word val) {
    __asm__ __volatile__("out %ax,%dx"::"a" (val), "d"(port));
}


void outl(word port, dword val) {
    __asm__ __volatile__("out %eax,%dx"::"a" (val), "d"(port));
}

It's been a few weeks since I last did inline assembler in gcc, but I think that should compile and work correctly.

--
Mats

Thank you, but the thing is that I have never touched assembly before. I hardly know basic c++.

Can I past the code from you post into a header file and use it in my project? Or does I have to do something else?

Yes, you can paste that into either a header or a .c(pp) file (and create prototypes in a .h file).

If you use it in a header, I would suggest adding "static inline" before each function, which will mean to the compiler "don't keep a copy of this function unless someone is calling it, and if possible, just stuff the code in where the call is".

I suspect that there are some Linux header files that contains these as macros/inline functions.

If you are planning to learn about hardware and "direct access to io-devices", I think you will need some understanding of assembler.

--
Mats

If you are planning to learn about hardware and "direct access to io-devices", I think you will need some understanding of assembler.

Not in any near future. Right now im learning cpp and are more than happy with that. I only need to open and close parallel ports. Which turned into a real pain in winXP.

Thanks for you great help. I will try it out tomorrow morning.

I did not get the above code to work. It is probably my fault, as I have never touched assembly before.

So here I am, asking to be spoon feed.

Code:

#include <iostream>


using namespace std;


typedef unsigned char byte;
typedef unsigned short word;
typedef unsigned long dword;

byte inb(word port) {
    byte res;
    __asm__ __volatile__("in %dx,%al": "=a"(res):"d"(port));
   return res;
}

word inw(word port) {
    word res;
    __asm__ __volatile__("in %dx,%ax": "=a"(res):"d"(port));
   return res;
}

word inl(word port) {
    word res;
    __asm__ __volatile__("in %dx,%eax": "=a"(res):"d"(port));
   return res;
}

void outb(word port, byte val) {
    __asm__ __volatile__("out %al,%dx"::"a" (val), "d"(port));
}

void outw(word port, word val) {
    __asm__ __volatile__("out %ax,%dx"::"a" (val), "d"(port));
}


void outl(word port, dword val) {
    __asm__ __volatile__("out %eax,%dx"::"a" (val), "d"(port));
}

main()
{
      system ("PAUSE");
      return 0;  
}

Thats "my" code, just to check if I can get it to compile.

The error I get is:

In function `byte inb(word)':
operand number missing after %-letter
operand number missing after %-letter

What do I need to do to make it work?

I have not added anything in the project settings which says I use assembly, do I have to do that in some way maybe?

Using Dev-c++ 4.9.9.2

Sorry for posting a follow up question so late, but summer is here and I have been in Turkey for a while.

Thanks for all help.