David,

Tcl is finding the shared library, if it didn't you would get a  
different error. BUt Tcl is not able to initialize the library because  
it can't find the initialization functions it expects.

The way Tcl loads a shared library extension is it takes the name of  
the shared library (or the package name if you have passed that into  
"package require"), upper-cases the first letter, lower-cases all the  
others, adds _Init and looks up that symbol and runs the function.

A common mistake is to forget the weirdo capitalization rules (which  
were invented to get around non-case-sensitive file systems).

Does your library indeed define Crax_Init and Crax_SafeInit functions?   
And are they exported?

You can use

nm /Users/drobin/Library/Tcl/CRAX/CRAX.dylib

You should see a "T" symbol (exported text) for both of these.

Jim

On Thursday, March 27, 2003, at 10:51  AM, David Robinson wrote:

>  Okay I realize that this is going to be a rather vague question and I  
>  apologize in advance but I'm not sure how to approach this.
> 
>  We've succeeded in building a Tcl extension in a fashion similar to  
>  TclSpeech (called CRAX).  However, when we execute 'package require  
>  CRAX' the following dump appears in the Wish console:
> 
>  package require CRAX
>  dyld: /Applications/Utilities/Wish Shell.app/Contents/MacOS/Wish Shell  
>  NSLookupSymbolInImage() dynamic library:  
>  /Users/drobin/Library/Tcl/CRAX/CRAX.dylib does not define symbol:  
>  _Crax_Init
>  dyld: /Applications/Utilities/Wish Shell.app/Contents/MacOS/Wish Shell  
>  NSLookupSymbolInImage() dynamic library:  
>  /Users/drobin/Library/Tcl/CRAX/CRAX.dylib does not define symbol:  
>  _Crax_SafeInit
>  couldn't find procedure Crax_Init
> 
>  It seems that the right library/Framework is not being linked in our  
>  infinite ignorance we've not been able to determine what we are  
>  missing.  Any suggestions or even guesses would be appreciated.
> 
>  Thanks for your patience,  Dave
> 
>  ----------------------------------------------------------------------- 
>  -------
>  Q: What do you have when 100 Manchester United Fans are buried up to  
>  their  necks in sand?
>  A: Not enough sand.
> 
> 
> 
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--
Jim Ingham                                   jingham@[...].com
Developer Tools
Apple Computer



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