Hi Mariano

Thanks for the tips, you got me on the right track. Some trial and lots of error got me to a solution.

In order to use MacOs system calls you have to:

1) identify the function you want to use e.g.�KLGetKeyboardLayoutCount

2) find out what header file this is defined in. here it's "Keyboards.h" in the Framework "Carbon/Carbon.h"

So far it's easy from the Apple documentation

3) find out which Bundle this is in. I used Finder to find out where Keyboards.h is used, it's used in HIToolbox.framework

4) find the actual compiled framework, on my system it's at:

/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox

5) I placed a copy of this file in the Pharo bundle at: �Pharo-1.0.app/Contents/Resources/HIToolbox

An the call looks like:

apiKLGetKeyboardLayoutCount

�� �< cdecl: ulong 'KLGetKeyboardLayoutCount' (void) module: 'HIToolbox'> ��

�� �^ self externalCallFailed.�

I tried a link to the bundle, that didn't work.

Probably the correct way to do this is to change Pharos RES path (in Pharo.sh) to include the a pointer to HIToolbox executable.

I may try that if I go further with this than a prototype.

Cheers

David

On 05 May, 2010, at 23:15, Mariano Martinez Peck wrote:

BTW....keyboards seems to be a .h� (a header) , but not a library...at least in my mac

Do you have also the library ?� I am still newbie with the Mac OS :(

Cheers

mariano

On Wed, May 5, 2010 at 11:10 PM, Mariano Martinez Peck <marianopeck@gmail.com> wrote:

On Tue, May 4, 2010 at 4:46 PM, David Wilson <djwilson@bluewin.ch> wrote:

Hi

I'm new to Pharo (although I was a Smalltalk programmer in the 90's), and I'm trying to use FFI to access an MacOs system function:

Hi and welcome!
�

apiKLGetKeyboardLayoutCount
� �< cdecl: ulong 'KLGetKeyboardLayoutCount' (void) �module: 'keyboards'>
� �^ self externalCallFailed.

I get an error "'Unable to find function address'" which seems to say the OS-module "keyboards" can't be found.

Exactly. That's the problem.
�

I can't figure out what the address should be.
The function is defined here: http://developer.apple.com/legacy/mac/library/documentation/Carbon/Reference/KeyboardLayoutServices/Reference/reference.html
(yes, it's deprecated, I have a very old mac runnning 10.4).

But you see the library in your computer, isn't it ? I mean, it is there, but FFI doesn't find it ?

�

I'm not sure if I'm using FFI correctly, do I have to somehow include the external library in the Pharo VM?

No, you shouldn't need to do that. However, you can try to put them there just to see if that's the problem. I think that at some point (depends on an order) the library is searched in the same place where you are calling from. So, yes, do a test, but just a test. It should work without doing that.

How did you install FFI ?� Which Pharo VM and image versions are you using ?

Can anyone help?

I would like too, but I don't have such library.

I developed a wrapper for a Clibrary called OpenDBX using FFI. In our website, some people experimented similar problems.
Please take a look to the title "Problems with Mac OS:"� of the following link:

http://www.squeakdbx.org/Compiling%20and%20installing%20OpenDBX
�
I also cc'ed people that can help you.

Cheers

Mariano

I'm looked for FFI examples, but don't find anything helpful.

David


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