[Vm-dev] Re: help on creating plugin

John M McIntosh johnmci at smalltalkconsulting.com
Wed Sep 17 15:22:57 UTC 2008

There is no slang defined methods.

The rule is

self blafoobar: thing
becomes blafoobar(thing)   when it builds the C code because it is  
methodName: argument  becomes methodName(argument)

For methods with more than one argument SLANG concatinates the parts  
into one Name.
Thus you can construct something like

self mem:  foo c: bar py: too

then becomes

Or so I remember

You can also use this to code procedures in SLANG for the plugin.
For example in the GStreamer plugin I code  a SLANG method

cb: element new: newPad pad: data
	"Ok the trick here is on the signal pad_add we may have multiple pads  
being created.
	Therefore we must find the sink pad that can handle the request. Note  
for ogg you could have the
	audio and video stream for example"

	| max result gstPadValue gstCapsValue |

	self var: #gstPadValue declareC: 'GstPad*  gstPadValue'.
	self var: #gstCapsValue declareC: 'GstCaps*  gstCapsValue'.
	self var: #data declareC: 'sqInt  *data'.

that becomes a C procedure
static sqInt cbnewpad(sqInt element, sqInt newPad, sqInt  *data)

On Sep 16, 2008, at 8:17 PM, Esteban Lorenzano wrote:

> Hi,
> Thanks for the answers... I'm trying to advance my plugin with your  
> advices, but is a little hard to understand (and no much time  
> available).
> I have a question, maybe very basic, but I'm a newbie at plugin  
> development:
> Is there a place where I can see all the Slang defined methods? I'm  
> asking because in some places I see a "self strlen: blah" and I  
> would like to know which ones are available for use,  instead of  
> fill my code of "self cCode: 'blah') sentences.
> Many thanks,
> Esteban

John M. McIntosh <johnmci at smalltalkconsulting.com>
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com

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