使用 Cocoa 的 Accessibility API 获取应用程序的 Dock 图标的位置

如何使用 Accessibility API 获取应用程序的 Dock 图标的位置？

找到了！使用这个论坛帖子 http://cocoadev.com/forums/discussion/1431/getting-dock-icon-position/p1作为参考，我能够根据我的需要调整给定的示例代码：

- (NSArray *)subelementsFromElement:(AXUIElementRef)element forAttribute:(NSString *)attribute
{
    NSArray *subElements = nil;
    CFIndex count = 0;
    AXError result;

    result = AXUIElementGetAttributeValueCount(element, (CFStringRef)attribute, &count);
    if (result != kAXErrorSuccess) return nil;
    result = AXUIElementCopyAttributeValues(element, (CFStringRef)attribute, 0, count, (CFArrayRef *)&subElements);
    if (result != kAXErrorSuccess) return nil;

    return [subElements autorelease];
}

- (AXUIElementRef)appDockIconByName:(NSString *)appName
{
    AXUIElementRef appElement = NULL;

    appElement = AXUIElementCreateApplication([[[NSRunningApplication runningApplicationsWithBundleIdentifier:@"com.apple.dock"] lastObject] processIdentifier]);
    if (appElement != NULL)
    {
        AXUIElementRef firstChild = (__bridge AXUIElementRef)[[self subelementsFromElement:appElement forAttribute:@"AXChildren"] objectAtIndex:0];
        NSArray *children = [self subelementsFromElement:firstChild forAttribute:@"AXChildren"];
        NSEnumerator *e = [children objectEnumerator];
        AXUIElementRef axElement;
        while (axElement = (__bridge AXUIElementRef)[e nextObject])
        {
            CFTypeRef value;
            id titleValue;
            AXError result = AXUIElementCopyAttributeValue(axElement, kAXTitleAttribute, &value);
            if (result == kAXErrorSuccess)
            {
                if (AXValueGetType(value) != kAXValueIllegalType)
                    titleValue = [NSValue valueWithPointer:value];
                else
                    titleValue = (__bridge id)value; // assume toll-free bridging
                if ([titleValue isEqual:appName]) {
                    return axElement;
                }
            }
        }
    }

    return nil;
}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    AXUIElementRef dockIcon = [self appDockIconByName:@"MYAPPNAME"];
    if (dockIcon) {
        CFTypeRef value;
        CGPoint iconPosition;
        AXError result = AXUIElementCopyAttributeValue(dockIcon, kAXPositionAttribute, &value);
        if (result == kAXErrorSuccess)
        {
            if (AXValueGetValue(value, kAXValueCGPointType, &iconPosition)) {
                NSLog(@"position: (%f, %f)", iconPosition.x, iconPosition.y);
            }
        }
    }
}