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

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

Please notice that the request for for a Console application. Most
graphics libraries are limited to non-console mode.

The djgpp compiler contains a DOS-extender to allow it to work in a Win32
environment and still hook interrupts etc. Also, the built-in graphics
support uses VESA and runs in console mode.

/Per W

On Sun, 22 Aug 2004, David McKen wrote:

> What version of windows are you running if you are running any version
> of NT (including 2000 & XP) then no matter what the compiler you will
> get this crash. You will have to use a graphics library to program
> graphics on any of these OSes (allegro, SDL, OpenGL, DirectX, are some
> options you can look into.
>
>
> James Dent wrote:
>
> > Hello.
> > I have been trying to program some low-level graphics routines for a
> > console application. All of the
> > C++ books I have read have used the data structure union REGS to
> > represent 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
> > 'int' command was
> > called.
> >
> > int mode = -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 interrupt
> >    // for changing screen mode.
> >
> >    mode = local_mode;
> >
> >    asm( "movb $0xF,%ah"         );          // The BIOS interrupt to
> > return
> >                                                         // the video
> > mode.
> >    asm( "int $0x10"            );                // The Video BIOS
> > interrupt.
> >    asm( "movb %al,_oldmode"     );        // Stick the mode value (in
> > %al)
> >                                                         // 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
> > mode.
> >    asm( "movb _mode,%al"        );         // Put the mode into %al
> >    asm( "int $0x10"            );                // Video BIOS interrupt.
> > }
> >
> > 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 to use assembly to the
> > same extent?
> >
> > Gratefully,
> >
> >> From the Assembly-Migraine afflicted.
> >
>
>
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