Hi John,
  Thanks for explanations, I'll also  download Tweak-Platforms to  
understand more.

Thanks
  Davide

On 10 Jan 2006, at 18:44, John M McIntosh wrote:

> Sure, you're missing the entire Sophie code base which uses this,  
> however at the moment the implementation of the caller of this is via
>
> Tweak-Platforms from the impara tweak server.
>
> I had added these types (MacCFString, MacCFType, MacCFURL,  
> MacCFURL), and the FFI interfaces to assist in getting the folder  
> paths for known os-x folder locations, however I've not actually  
> tested *all* the api calls yet.
>
> Usage is quite straightforward.
>
>
> 	buffer _ ByteArray new: 4096.
> 	error := self cFStringGetCString: possibleCFString buffer: buffer  
> size: buffer size encoding: 0.
> 	self cFRelease: possibleCFString.
>
> Typically I've been copying the C definition into the method like  
> so for documentation purposes.
>
> cFStringGetCString: aStringRef buffer: aBuffer size: aSize  
> encoding: anEncoding
> 	<cdecl: bool 'CFStringGetCString' (MacCFString* char* long long)  
> module:'Carbon.framework'>
> 	^ self externalCallFailed
>
> "Boolean CFStringGetCString (
>    CFStringRef theString,
>    char *buffer,
>    CFIndex bufferSize,
>    CFStringEncoding encoding
> );"
>
> I'll note that I'm cheating and resolving CFIndes and  
> CFStdringEncoding to long, but you could define a structured class  
> with a long field for those.
>
> Save your image often, mistakes in coding the FFI logic will  
> generally crash your VM.
>
> On 10-Jan-06, at 5:42 AM, Davide Varvello wrote:
>
>> Hi Bert,
>>
>>
>>> As for your questions, yes, FFI is just fine for this. And I'd  
>>> recommend Carbon.
>>>
>>> For a bit of working recent Carbon FFI code have a look at
>>>
>>> 	http://source.impara.de/Sophie.html
>>>
>>> The "Files-Locations" package uses FFI calls to locate system  
>>> folders
>>
>>
>> I downloaded the Files-Locations-bf.18.mcz it contains 4 classes:  
>> MacCFString, MacCFType, MacCFURL, MacCFURL but there are no  
>> methods that call os libraries. Am I missing something?
>> Thanks
>>  Davide
>>
>>
>
> --
> ====================================================================== 
> =====
> John M. McIntosh <johnmci at smalltalkconsulting.com> 1-800-477-2659
> Corporate Smalltalk Consulting Ltd.  http:// 
> www.smalltalkconsulting.com
> ====================================================================== 
> =====
>
>