Xref:	news2.mv.net comp.os.msdos.djgpp:2962
From:	latorre AT ix DOT netcom DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	Subject: [pleh] djgfx linear VBE2 example code problems
Date:	Sun, 21 Apr 1996 10:20:57 -0700
Organization:	Netcom
Lines:	26
Message-ID:	<317A6E79.28D4@ix.netcom.com>
NNTP-Posting-Host:	frd-md1-01.ix.netcom.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I'm totaly new to protected mode and was trying to work through the
example code from the DJGFX doc but keep getting GPF's. I think the
problem is with the code for copy_buffer2:
    
    void copy_buffer2(void)
    {
        movedata( _my_ds(), doublebuffer,
                  our_global_selector, videoptr,
                  width*height );
    }

doublebuffer == malloc(width*height)
videoptr ==     (unsigned char *)0x0 // I tried the linear_address too

I set up our_global_selector thusly:
        
    short our_global_selector = __dpmi_allocate_ldt_descriptors(1);
    __dpmi_set_segment_base_address( our_global_selector,
                                     linear_address);
    
What needs to change ? What am I doing wrong ?


Thanks,

mlarch AT fred DOT net

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