Like this nested type of property, how should I write its structure?
Hank Huang
Daniel B. Widdis
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Hank Huang
Sent: Wednesday, July 7, 2021 12:29 AM
To: Java Native Access <jna-...@googlegroups.com>
Subject: Re: Like this nested type of property, how should I write its structure?
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Daniel Widdis
All of these <something>Ref variables are pointers. You could probably get away with just mapping everything to a pointer, ant it would work, but it’s better to be type safe.
Some of these pointers point to specific things (in this case, an element of a UI like a button or toolbar, etc.) which is why for type safety you should generally do more than just use “Pointer” everywhere.
You should probably be able to define this and do most of what you need to if you use the mapping in CoreFoundation:
class AXUIElementRef extends CFTypeRef {
}
Or you could also do this with core JNA.
class AXUIElementRef extends PointerType {
}
Let me know what doesn’t work with this simple mapping.
From: 'Hank Huang' via Java Native Access <jna-...@googlegroups.com>
Reply-To: <jna-...@googlegroups.com>
Date: Tuesday, July 6, 2021 at 5:30 PM
To: "jna-...@googlegroups.com" <jna-...@googlegroups.com>
Subject: Re: Like this nested type of property, how should I write its structure?
I found the corresponding attribute of AXUIElementRef in http://mirror.informatimago.com/next/developer.apple.com/releasenotes/Accessibility/AssistiveAPI.html. But the Value Type of the attribute of kAXParentAttribute and kAXWindowAttribute is another AXUIElementRef, which makes me unable to start. At the same time I also refer to the mapping of CFStringRef.
From: jna-...@googlegroups.com <jna-...@googlegroups.com> on behalf of Daniel B. Widdis <wid...@gmail.com>
Sent: Wednesday, July 7, 2021 12:29 AM
To: Java Native Access <jna-...@googlegroups.com>
Subject: Re: Like this nested type of property, how should I write its structure?
[EXTERNAL]
First, some feedback. It's difficult to review screenshots in my email client and it's harder to guess what you're trying to do.
Secondly I didn't see the question for a while because it's in the subject line. It would be more helpful to readers ask the question in the body of the email.
It looks like you want to map AXUIElementRef. For that you need to go to either the documentation or the header file.
A brief web search shows the documentation here: AXUIElementRef | Apple Developer Documentation
That matches the header file declaration: WebCoreSystemInterface.h (apple.com)
Both appear to be pointers so you could simply extend PointerType to decorate it for type safety. However, the documentation for AXUIElement, which the reference points to, is here: AXUIElement.h | Apple Developer Documentation
The overview on that page indicates it's an extension of CFTypeRef, which is mapped in JNA's CoreFoundation class. See the mappings for CFNumberRef and CFStringRef, which are declared similarly and have helper methods to provide a more object oriented approach. jna/CoreFoundation.java at f89905af56aef305d569db5ae1b06607807edcc9 · java-native-access/jna (github.com)
On Tue, Jul 6, 2021 at 7:41 AM 'Hank Huang' via Java Native Access <jna-...@googlegroups.com> wrote:
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Dan Widdis
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Hank Huang
public interface ApplicationServices extends Library {I try to call AXUIElementCopyAttributeValue to get the "kAXEnabledAttribute" for element, But it failed.
ApplicationServices INSTANCE = Native.load("ApplicationServices", ApplicationServices.class);
class AXUIElementRef extends CFTypeRef {
public AXUIElementRef() {
super();
}
public AXUIElementRef(Pointer p) {
super(p);
}
}
AXUIElementRef AXUIElementCreateApplication(int pid);
CFBooleanRef AXUIElementCopyAttributeValue(AXUIElementRef element,String attribute,CFBooleanRef value);
}
public static void main(String[] args) {
ApplicationServices.AXUIElementRef element = ApplicationServices.INSTANCE.AXUIElementCreateApplication(75239);
System.out.println(ApplicationServices.INSTANCE.AXUIElementCopyAttributeValue(element,"kAXEnabledAttribute", null).booleanValue());
}
Sent: Wednesday, July 7, 2021 9:13 AM
To: jna-...@googlegroups.com <jna-...@googlegroups.com>
Subject: Re: Like this nested type of property, how should I write its structure?
Hank Huang
Daniel Widdis
> I try to call AXUIElementCopyAttributeValue to get the "kAXEnabledAttribute" for element, But it failed.
The second argument of AXUIElementCopyAttributeValue is a CFString. You can’t just pass a regular String.
Change your attribute parameter to CFString and create one with your String. (And CFRelease() it when you’re done with it. The CFString helper methods in JNA’s CoreFoundation class can help with all this.)
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Hank Huang
public class test {
// This is the standard, stable way of mapping, which supports extensive
// customization and mapping of Java to native types.
public interface ApplicationServices extends Library {
ApplicationServices INSTANCE = Native.load("ApplicationServices", ApplicationServices.class);
class AXUIElementRef extends CFTypeRef {
public AXUIElementRef() {
super();
}
public AXUIElementRef(Pointer p) {
super(p);
}
}
AXUIElementRef AXUIElementCreateApplication(int pid);
int AXUIElementCopyAttributeValue(AXUIElementRef element, CFStringRef attribute, CFTypeRef value);
void AXUIElementPerformAction(AXUIElementRef element,CFStringRef action);
}
public static void main(String[] args) {
CFStringRef attribute = CFStringRef.createCFString("kAXTitleAttribute");
CFArrayRef value;
value = new CFArrayRef();
ApplicationServices.AXUIElementRef element = ApplicationServices.INSTANCE.AXUIElementCreateApplication(75102);
ApplicationServices.INSTANCE.AXUIElementCopyAttributeValue(element,attribute,value);
System.out.println("value = " + value);
attribute.release();
// ApplicationServices.INSTANCE.AXUIElementPerformAction(element,CFStringRef.createCFString("kAXPressAction"));
}
}
/// return value = NULLI tried to do this, but the return value it gave me was just null and I make sure my pid is correct
To: jna-...@googlegroups.com <jna-...@googlegroups.com>
Subject: Re: Like this nested type of property, how should I write its structure?
Daniel B. Widdis
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Daniel B. Widdis
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Hank Huang
2021年7月8日 上午3:36，Daniel B. Widdis <wid...@gmail.com> 写道：[EXTERNAL]
[EXTERNAL]
[EXTERNAL]
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