dev: 使用AXUIElementCopyAttributeValue返回错误

[dengyan1992]

• (void)getSelectedTextByAccessibility:(void (^)(NSString *_Nullable text, AXError error))completion { AXUIElementRef systemWideElement = AXUIElementCreateSystemWide(); AXUIElementRef focusedElement = NULL;

  AXError getFocusedUIElementError = AXUIElementCopyAttributeValue(systemWideElement, kAXFocusedUIElementAttribute, (CFTypeRef *)&focusedElement);

  NSString *selectedText; AXError error = getFocusedUIElementError;

  // !!!: This frame is left-top position CGRect selectedTextFrame = [self getSelectedTextFrame]; // NSLog(@"selected text: %@", @(selectedTextFrame));

  self.selectedTextFrame = [EZCoordinateUtils convertRectToBottomLeft:selectedTextFrame];

  if (getFocusedUIElementError == kAXErrorSuccess) { AXValueRef selectedTextValue = NULL; AXError getSelectedTextError = AXUIElementCopyAttributeValue(focusedElement, kAXSelectedTextAttribute, (CFTypeRef )&selectedTextValue); if (getSelectedTextError == kAXErrorSuccess) { // Note: selectedText may be @"" selectedText = (__bridge NSString )(selectedTextValue); selectedText = [selectedText removeInvisibleChar]; self.selectedText = selectedText; NSLog(@"--> Accessibility success, getText: %@", selectedText); } else { if (getSelectedTextError == kAXErrorNoValue) { NSLog(@"Not support Auxiliary, error: %d", getSelectedTextError); } else { NSLog(@"Accessibility error: %d", getSelectedTextError); } } error = getSelectedTextError; }

  if (focusedElement != NULL) { CFRelease(focusedElement); } CFRelease(systemWideElement);

  completion(selectedText, error); }

使用这部分代码，AXError getFocusedUIElementError = AXUIElementCopyAttributeValue(systemWideElement, kAXFocusedUIElementAttribute, (CFTypeRef )&focusedElement);返回kAXErrorCannotComplete，或者 AXError getSelectedTextError = AXUIElementCopyAttributeValue(focusedElement, kAXSelectedTextAttribute, (CFTypeRef )&selectedTextValue);返回kAXErrorAttributeUnsupported。一直没有成功，授权了辅助功能。想向各位大神请教一下是什么原因，非常感谢。

[github-actions[bot]]

Hello dengyan1992, Thank you for your first issue contribution 🎉

[tisfeng]

这里不成功，有很多种原因，具体请查看 苹果文档

   /*! The function cannot complete because messaging failed in some way or because the application with which the function is communicating is busy or unresponsive. */
    kAXErrorCannotComplete          = -25204,

    /*! The attribute is not supported by the AXUIElementRef. */
    kAXErrorAttributeUnsupported        = -25205,

[dengyan1992]

您好，我运行Easydict工程是正常的，然后自己对照该工程调用，辅助功能的权限是开了的，目前没有这个函数没有返回成功过，查看文档也看不出有什么问题，上网查资源调用方法都是一样的，想请教一下大佬，具体会有哪些问题导致不成功

[tisfeng]

这个问题比较复杂，辅助功能权限有时候会有 bug，你可以尝试移除（不是关闭）应用权限然后重新添加。

[tisfeng]

kAXErrorCannotComplete 我没遇到过，kAXErrorAttributeUnsupported 遇到过，表示控件属性不支持，因为不是所有的应用都支持 AXUIElementCopyAttributeValue 这个函数，如苹果自己的 Safari, Mail 等。