Re: [Dev-C++] Where are int86() and union REGS?

[Per W. <pw...@ia...>]

Take a look at the djgpp compiler. It is a DOS extender, i.e. for running
32-bit code from the original DOS command line. It has very good support
for graphics, and the applications runs from the Win32 command line too.

/Per W

On Sun, 22 Aug 2004, James Dent wrote:

> Hello.
> I have been trying to program some low-level graphics routines for a cons=
ole
> application. All of the
> C++ books I have read have used the data structure union REGS to represen=
t
> the registry, and
> functions such as int86(), outport, etc. etc. (included in dos.h). This
> header may be obsolete, or
> a Borland extension of C++ - I don't know. I turned to assembly to
> accomplish the same function,
> but the code shown below resulted in the Blue Screen of Death when the 'i=
nt'
> command was
> called.
>
> int mode =3D -1;
>
> void SetVideoMode (int local_mode)
> {
>     // This function consists of two parts: firstly, it saves the current
>     // video mode in the global variable oldmode, and secondly, it loads
>     // various values into the registry and calls the Video BIOS interrup=
t
>     // for changing screen mode.
>
>     mode =3D local_mode;
>
>     asm( "movb $0xF,%ah"         );          // The BIOS interrupt to ret=
urn
>                                                          // the video mod=
e.
>     asm( "int $0x10"            );                // The Video BIOS
> interrupt.
>     asm( "movb %al,_oldmode"     );        // Stick the mode value (in %a=
l)
>                                                          // into the
> variable oldmode.    */
>
>     // The old mode has been retrieved, now all that needs to be done is =
the
>     // actual mode changing.
>
>     asm( "movb $0x0,%ah"         );          // Interrupt 0h - Screen mod=
e.
>     asm( "movb _mode,%al"        );         // Put the mode into %al
>     asm( "int $0x10"            );                // Video BIOS interrupt=
=2E
> }
>
> I have never been very good at assembly, but this code has been terribly
> hard to debug. Does anyone
> know if a new version of the dos.h functions exists for Dev-C++, or how t=
o
> use assembly to the
> same extent?
>
> Gratefully,
> >From the Assembly-Migraine afflicted.
>
> _________________________________________________________________
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>
>
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