XP won't allow access to the port. Install GiveIO, and it will.
http://sourceforge.net/project/showf...ease_id=150767

All of the comments I've found (with my Google search that you should have made) indicate that application level programs under 32-bit windows (aka Win32) cannot directly access the I/O ports.

The primary suggestion appears to be that if you really need that level of access to the hardware you will need to write a driver to support it. There was also a mention of some sample code included in the Windows DDK.

I have no personal experience in that area, good luck.

Thank u

> I have used outportn(base,pin); cmd with header file dos.h
Which is older - you or your compiler?

I'm figuring you're using some fossil like TurboC.

The answer is to "get with the times", and use a compiler which is actually compatible with your OS, and not something which is half-heartedly supported for backward compatibility.

I installed GiveIO
But its not working is there any other way out

which is the latest C compiler please tell me

After you run your program, check the state of the port pins with LPT to confirm it isn't working.
http://neil.fraser.name/software/lpt/
If not, there's also Userport.
http://www.mattjustice.com/parport/par_nt.html
Your program is only going to work in Turbo C because you're using DOS functions.

> which is the latest C compiler please tell me
http://en.wikipedia.org/wiki/Visual_Studio_Express

still riding with problem