使用AXTextMarker的WebKit应用程序上的macOS可访问性API [英] macOS accessibility API on WebKit applications with AXTextMarker

问题描述

我需要从Safari，Mail等Webkit应用程序访问数据，也许还要从其他应用程序访问数据.我可以在Accessibility Inspector中看到:AXTextMarker和AXTextMarkerForRange.

I need to access data from webkit applications such as Safari, Mail and maybe others. I can see in the Accessibility Inspector there is :AXTextMarker and AXTextMarkerForRange.

我尝试了获取此信息的常用方法:

I tried the usual way to get this info :

AXUIElementRef systemWideElement = AXUIElementCreateSystemWide();    //creating system wide element
AXUIElementRef focussedElement = NULL;

AXError error = AXUIElementCopyAttributeValue(systemWideElement, kAXFocusedUIElementAttribute, (CFTypeRef *)&focussedElement);                //Copy the focused
if (error != kAXErrorSuccess){
    NSLog(@"Could not get focused element");
}else{
    AXValueRef marker = NULL;
    AXError getTextValueError = AXUIElementCopyAttributeValue(focussedElement, kAXMarkerUIElementsAttribute , (CFTypeRef *)&marker);        
}

kAXMarkerUIElementsAttribute是我用Marker可以看到的唯一东西，但是每次都为空.

kAXMarkerUIElementsAttribute is the only thing I can see with Marker but everything is empty each time.

我猜出于安全原因，我无法访问它们?有什么可能的办法.我正在为阅读困难的人开发一个应用程序，它确实可以提供帮助.

I guess for security reasons, I cannot access them? Is there any way possible. I am developing an app for people with difficulties reading and it could really help.

谢谢

推荐答案

提示和技巧:

向focussedElement询问其支持的属性.使用功能:

Ask focussedElement for its supported attributes. Use the functions:

AXError AXUIElementCopyAttributeNames(AXUIElementRef element, CFArrayRef  _Nullable *names);

返回指定的辅助功能对象支持的所有属性的列表.

Returns a list of all the attributes supported by the specified accessibility object.

和

AXError AXUIElementCopyParameterizedAttributeNames(AXUIElementRef element, CFArrayRef  _Nullable *names);

返回指定的辅助功能对象支持的所有参数化属性的列表.

Returns a list of all the parameterized attributes supported by the specified accessibility object.

大多数未记录的属性不言自明.

Most undocumented attributes are self explanatory.

例如，将所选文本作为属性字符串获取:

For example get the selected text as attributed string:

CFTypeRef markerRange = NULL;
AXError error = AXUIElementCopyAttributeValue(focussedElement, (CFStringRef)@"AXSelectedTextMarkerRange", &markerRange);
CFTypeRef result = NULL;
error = AXUIElementCopyParameterizedAttributeValue(focussedElement, (CFStringRef)@"AXAttributedStringForTextMarkerRange", markerRange, &result);

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