Subject:
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Re: LDrawIni API (was: LDRAWPREDIRS LDRAWPOSTDIRS - additional search paths)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 16 Mar 2004 22:57:16 GMT
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Viewed:
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6484 times
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In lugnet.cad.dev, Don Heyse wrote:
> In lugnet.cad.dev, Lars C. Hassing wrote:
> > Here are my ideas of an API for accessing the LDrawIni settings.
>
> <Snip ideas>
>
> Here are a few random thoughts on those ideas...
>
> I haven't thought about it enough to decide if I have a preference
> on the format of the UnknownFlags. Either way seems ok to me.
>
> If directories marked with <SKIP> are excluded from the search dirs,
> how would I temporarily enable a <SKIP> directory?
By modifying ldraw.ini or setting an env var.
Why would you want to enable a <SKIP> dir from within a program?
> I mentioned this before but apparently nobody noticed. :^) How about
> having LDrawIniComputeRealDirs() also substitute the value of
> %USERPROFILE% or $HOME for a <HOMEDIR> tag? That way I can have a
> platform independent way of pointing to part directories in my home
> directory from a centralized ldraw.ini file on the network. Or a
> single ldraw.ini file on a dual boot PC.
I did notice, but forgot it, sorry.
%USERPROFILE% or $HOME for <HOMEDIR>, OK fine with me.
> Perhaps the PrivateData should tell where the info came from: what ini
> file, environment vars, or LdrawIniResetSearchDirs(). (I'm not actually
> sure I need to know unless I'm planning on saving ini modifications.)
Yes, I actually thought of adding
char *LDrawDirSource;
char *SearchDirsSource;
char *LgeoDirSource;
strings you could use for e.g. debugging.
L3P could print them in the POV header.
Any interest?
> Are you planning on making a similar API for creating or modifying and
> saving the ini file? I'll probably try to use the LdrawSetup program
> as an LDDP style plugin, but others may want to incorporate it directly
> into their programs.
You can copy'n'paste the dialog resources and the corresponding
.h and .cpp files from the LDrawSetup project (VC6) into your program,
or you can simply launch LDrawSetup.
> I see you've included the LGEODIR. Have you given any thought to
> making this extensible beyond that? We might someday like to be able
> to locate some other ldraw part conversion library via the ldraw.ini
> file. For example the LDRAWPOV library. Could LDrawIniGet() be
> extended to handle this, or would a more generic function be better.
>
> char *LDrawIniGetVar(const char *LdrawDir, char *VarName, int *ErrorCode);
>
> LgeoDir = LdrawIniGetVar(NULL, "LgeoDirectory", &err);
> ldrawpovDir = LdrawIniGetVar(NULL, "LdrawpovDir", &err);
I had my doubts about whether to include LgeoDir or not.
I know that probably only L3P uses it, but the structure could/should contain
all data found in ldraw.ini?
In that case you would simply publish an update of the LDrawIni source code
supporting the LdrawpovDir.
However, LDrawIniGetVar is a good idea for not very common variables.
More arguments could be: const char *EnvVar, char **Source
I'm open to both.
/Lars
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