Re: How to Define "extern" keyword in C++ Builder(Here is Complete Code)

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#15046

From: Remy Lebeau (TeamB)
Date: Tue, 22 Jul 2003 23:49

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"Umar Kazi" <umarkazi@yahoo.com> wrote in message
news:3f1dc4d5$1@newsgroups.borland.com...

> Actually I am trying to access input port while using windows XP.

Can't be done directly.  Windows is a protected OS.  Particular more so in
the NT family (NT, 2K, and XP).  Direct access to hardware is not allowed.
You need to use a device driver for that instead.

> void main()
> extern "C"
> {
> short __import __stdcall InpVal(378h);
> }

That is not valid code.  It is declaring a function named main() which
contains an inner function InpVal() inside of it.  C++ does not support
inner functions.  If all you are trying to do is call the InpVal() function
from within your program's main() function, then it should look more like
this instead:

    int main()
    {
        short s = InpVal(0x378);
        // use s as needed
        return 0;
    }


Gambit

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Subject: Re: How to Define "extern" keyword in C++ Builder(Here is Complete Code)
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