Pointer to memory

I found the code below as a DOS program and I need it to include in my MFC Windows program but I got an error of "Memory could not be read", Is there another way to handle this in Windows?

This is the code:

unsigned int GetLPT1Addr()
{
unsigned int far *ptraddr;
unsigned int address;
ptraddr=(unsigned int far*)0x00000408;
address=*ptraddr;
return address;
}

Thanks in advance,
Alextrons

32 bit windows and 16 bit DOS handle things very differently. You cannot expect to port old DOS code like this to a 32 bit environment.

If you want to "talk" to a port, look at the CreateFile() API function with particular regard to the "communications resources" sections.

Thanks Adrian for the idea, but how about _inp() and _outp() functions? Can we use this to get the address of LPT1? And you mean that there is no "ptraddr=(unsigned int far*)0x00000408; " kind of code in VC++? Can you make an equivalent code for me for that one line?


Sorry for being insistent, I hope you don't mind.

Quote:

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but how about _inp() and _outp() functions?

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You can't use those in a win32 app either. As Adrian has stated you can use CreateFile(), along with these.

Quote:

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Originally posted by Alextrons
Thanks Adrian for the idea, but how about _inp() and _outp() functions? Can we use this to get the address of LPT1? And you mean that there is no "ptraddr=(unsigned int far*)0x00000408; " kind of code in VC++? Can you make an equivalent code for me for that one line?


Sorry for being insistent, I hope you don't mind.

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It has nothing to do with VC++. Windows won't let you access memory like that. Memory management prohibits you from accessing memory not allocated to your program.

So can teach how to do it in Windows?

So can you please teach me how to do it in Windows.

to Alextrons: If you make a typo, you have an EDIT button in the lower right corner of your post. No need to post a new one ;)

Ah...Ok thanks...

Yeppers, that is exactly why you use the new API (It's called: WinAPI)--- It has a toolbox full of routines to do everything and more that you could do in dos.

You don't go direct to devices under the API, you call a manager and uses it's routines to access that device.