optimize

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On 13/01/2008 at 23:05, xxxxxxxx wrote:

User Information:
Cinema 4D Version:    
Platform:   Windows  ;   
Language(s) :     C++  ;

---------
Hi!
Is it a C++ subtlety which I will never understand or is it really
a compiler fault (Microsoft C++ 6.0) ?
the following code works fine, but delivers garbage if
speed-optimized.Whats wrong?
   //------------------------------
   Filename make_Filename(Filename path , String name , String suff )
   {
     Filename p  = path;
     Filename n  = Filename(name);
     Filename pn = p + n;
     pn.SetSuffix(suff);
     return(pn);
   };
   //------------------------------
   ...........
     BaseFile *bf = BaseFile::Alloc();
     Filename filnam;
              filnam = make_Filename(GeGetPluginPath() , String("test") , String("txt"));
  
                   ---> c:\maxon....\myplugdir est.txt == ok
   speedoptimized  ---> c:\maxon....\myplugdir\.        ==
  
     bf->Open(filnam, GE_READ , FILE_DIALOG ,GE_INTEL);
   .....
   //------------------------------
Can someone help?

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On 14/01/2008 at 00:39, xxxxxxxx wrote:

The backslash '' is used for such things as '\n' you need to use two '\' to get a single character as a backslash.

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On 14/01/2008 at 07:18, xxxxxxxx wrote:

the "" part of the message denotes the two different results of
a) compiled without optimiziation
b) *with* optimization

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On 14/01/2008 at 08:45, xxxxxxxx wrote:

You should use Filename.SetFile() instead of '+' (it's more reliable). Also, I've found that there is no real equivalence for '=' with Filename. Better to do it like this:

> Filename p = Filename(path);
> p.SetFile(name);
> p.SetSuffix(suff);
> return (p);

Not certain what you mean by 'speed-optimized'? The default SDK project build settings specify "Maximize Speed" for optimizations.

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On 14/01/2008 at 21:47, xxxxxxxx wrote:

Hi.
Of course "Maximize Speed.
I wanted to know, if its my fault (as usual) or if the
compiler did something wrong.
unfortunately the function
   Filename make_Filename(Filename path , String name , String suff )
seems to work correctly. Its the call which does something,
but I cannot find out whats wrong. Its all a little bit
worrying, because I have not the slightest idea what to do
(or not to do).

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On 14/01/2008 at 22:47, xxxxxxxx wrote:

For which version of C4D is this being built - which SDK?

I've never experienced a problem like that. This can sometimes be unexpected code problems elsewhere seeping into seemingly good code (e.g.: memory corruption).

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On 15/01/2008 at 00:43, xxxxxxxx wrote:

Hi.
 c4d 9.6
 sdk 8.5
 I dont believe that this has any importance.
 Memory corruption? No, I dont think so. Maybe an unfortunate
compiler settings. I think I will compare with the originals.
I *have* expererienced different behaviour of optimzed/not optimuzed
programmes but that was my own fault.

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On 15/01/2008 at 05:08, xxxxxxxx wrote:

Sorry, must have been having a dumb moment...

Have you tried passing them as local variables to see if it makes any difference,e.g.

> _
> String test_str="Test",txt_str="Txt";
>
> filnam = make_Filename(GeGetPluginPath(), test_str,txt_str);
> _

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On 16/01/2008 at 01:23, xxxxxxxx wrote:

HI!
  --> Have you tried passing them as local variables
Now I have. No difference.
But I think its really a compiler error.
As far as I cannot understand that kind of stuff, the compiler
forgets to reserve memory for the result of GeGetPluginPath()
on the stack. So the other parameters are overridden and
this could well explain the results.
Now I use : Filename localvar = GeGetPluginPath(). ... and so on.
and its working now.
...until the next next time of course.