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Re: [Pharo-users] Using FFI to call a MacOs System function

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Mariano Martinez Peck

Re: [Pharo-users] Using FFI to call a MacOs System function

On Tue, May 4, 2010 at 4:46 PM, David Wilson <[hidden email]> 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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johnmci

Re: [Pharo-users] Using FFI to call a MacOs System function

Well

* KLGetKeyboardLayoutCount() *** DEPRECATED ***

* Deprecated:

* Use TISCreateInputSourceList API to create a list of input

* sources that match specified properties.

* Summary:

* Returns the number of keyboard layouts.

* Mac OS X threading:

* Not thread safe

* Parameters:

* oCount:

* On exit, the number of keyboard layouts

* Availability:

* Mac OS X: in version 10.2 and later in Carbon.framework [32-bit only] but deprecated in 10.5

* CarbonLib: not available in CarbonLib 1.x, is available on Mac OS X version 10.2 and later

* Non-Carbon CFM: not available

That would imply you need to say

module: 'Carbon.framework'

If you look at the usage of FFI in Sophie, you'll find *lots* of examples

http://www.opensophie.org/

just download the app run and tap "cmd-'.'" to get a debugger up.

But I think there was an example in the FFI stuff once. Say:

apicall: void 'GetMouse' (MacPoint) module:'Carbon.framework'>

You can also set SqueakDebug to 1 in the Squeak VM's info.plist setting to

get the VM to print lots more diagnostics info to the Console when it attempts to run for the entry point name .

On 2010-05-05, at 2:10 PM, Mariano Martinez Peck wrote:

On Tue, May 4, 2010 at 4:46 PM, David Wilson <[hidden email]> 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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John M. McIntosh <[hidden email]> Twitter: squeaker68882

Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com

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DavidWilson

Re: [Pharo-users] Using FFI to call a MacOs System function

Hi John

It works as you describe, thanks.
Sorry only to reply now, your post didn't come to me via email (don't know why!) I only saw it today.

David