Hi
Eventually it is a bit more complicate. I thought I could make it simpler but
not.
The complete example is that I want to call a objective-c method that take a
struct as parameter:
@interface NSWindow
- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)windowStyle
backing:(NSBackingStoreType)bufferingType defer:(BOOL)deferCreation
@end
The first parameter is a NSRect.
NSrect is a struct of basically 4 double on 64bit platform.
I call the method #initWithContentRect:styleMask:backing:defer: using the
objective-c runtime:
void
objc_msgSend(id receiver, SEL msg, ...);
My cCall to objc_msgSend is define as follow:
ObjcRuntime class >> objcMsgSend: receiver selector: sel args: args [
<cCall: 'objc_msgSend' returning: #cObject args: #( #cObject #cObject
#variadic )>
]
I have also define the struct NSRect as follow:
CStruct subclass: NSRect [
<declaration: #( (#x #double) (#y #double) (#w #double) (#h #double) )>
]
But the invocation doesn't work:
nsRect := NSRect new.
nsRect x value: 0.0.
nsRect y value: 0.0.
nsRect w value: 100.0.
nsRect h value: 100.0
ObjcRuntime objcMsgSend: nsWindow selector: initSeld args: {nsRect. 15. 2. 1}.
Thanks
----- Message d'origine ----
> De : Holger Hans Peter Freyther <[email protected]>
> À : Mathieu Suen <[email protected]>
> Cc : [email protected]
> Envoyé le : Jeu 17 février 2011, 23h 01min 01s
> Objet : Re: [Help-smalltalk] Passing a struct to a c-callout
>
> On 02/17/2011 09:29 PM, Mathieu Suen wrote:
>
> > oops sorry in fact I mean:
> >
> > foo: list [
> > <cCall: 'foo' returning: #void args: #( #variadic )>
> > ]
>
> could you create an example that works with the C library? e.g. printf (but
> paolo was already adding a binding for that). And doesn't va_start need the
> argument of the last type? this would mean that args should be something like
> #(#something #variadic)?
>
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