In the Compatibility Guide, it says:
"You can verify that this feature set is implemented by checking the version
of the Window Manager. If the Window Manager version is 4 or greater, the
High-Density Display feature set is supported. To check the version of the
Window Manager, use this call:
err = FtrGet(sysFtrCreator, sysFtrNumWinVersion, &version);
Upon return, if version has a value of 4 or greater, the High-Density
Display feature set is present. Note that just because the High-Density
Display feature set is present, it isn't necessarily being used. You may
want to check the density of the screen, as follows:
WinScreenGetAttribute(winScreenDensity, &attr);
if (attr == kDensityDouble) {
//the screen is double density
}
That's what I am doing...
"Tim Kostka" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> You're checking for the wrong thing. WinScreenGetAttribute is
"Implemented
> only if the High-Density Display Feature Set is present." So check for
that
> instead of OS 4.0+. For OS 5.0+, the HDD set is always present.
>
> err = FtrGet(sysFtrCreator,
> sysFtrNumWinVersion, &version);
>
> Upon return, if version has a value of 4 or greater, the High-Density
> Display feature set is present.
>
> It's my guess that none of the emulator rom's support the HDD set.
>
> --
> Tim Kostka
> http://www.nuprograms.com
>
>
> "Steve A" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED]
> > I am trying to determing if double-density mode is enabled. Before
> calling
> > WinScreenGetAttribute, I make sure I'm running OS 4.0 or later.
However,
> > using the emulator (with a 4.2 rom) it crashes when
WinScreenGetAttribute
> is
> > called with a SysReserved40Trap1 error ("This routine does not exist in
> this
> > version of the Palm OS"). What is newbie-me doing wrong?
> >
> > #define version40 0x04003000
> > DWord dwRomVersion;
> >
> > FtrGet(sysFtrCreator, sysFtrNumROMVersion, &dwRomVersion);
> > if (dwRomVersion >= version40) // dwRomVersion is 0x4103000
> > {
> > UInt32 attr;
> > WinScreenGetAttribute(winScreenDensity, &attr); // Dies here.
> > if( attr == kDensityDouble )
> > bDoubleDensityMode = true;
> > }
> >
> > Thanks!
> >
> >
> >
> >
>
>
>
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