Thread: [Mwinapi-commits] SF.net SVN: mwinapi:[122] trunk/ManagedWinapi/Accessibility/ AccessibleObjectList
Status: Beta
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From: <zi...@us...> - 2014-11-25 17:35:40
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Revision: 122
http://sourceforge.net/p/mwinapi/code/122
Author: ziewer
Date: 2014-11-25 17:35:37 +0000 (Tue, 25 Nov 2014)
Log Message:
-----------
Improved AccessibleEventListener.GetAccessibleObject(): Return parent or window on failure IAccessible implementation of object and/or child is missing.
This avoids exceptions for HTML content in Internet Explorer
Modified Paths:
--------------
trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs
Modified: trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs
===================================================================
--- trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs 2014-11-25 15:49:44 UTC (rev 121)
+++ trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs 2014-11-25 17:35:37 UTC (rev 122)
@@ -161,6 +161,18 @@
IAccessible iacc;
object child;
uint result = AccessibleObjectFromEvent(e.HWnd, e.ObjectID, e.ChildID, out iacc, out child);
+
+ // Note: AccessibleObjectFromEvent() sometimes fails due to missing IAccessible implementation of object and/or child
+ // This often happens for HTML content in Internet Explorer (e.g. for any <DIV> w/o 'role' attribute set).
+ // Try again without using ChildID and/or ObjectID,
+ // i.e. ChildID==0 will return the parent object; ObjectID==0 will return the parent window
+ if (result != 0 && e.ChildID != 0)
+ // second chance: try to receive object instead of child
+ result = AccessibleObjectFromEvent(e.HWnd, e.ObjectID, 0, out iacc, out child);
+ if (result != 0)
+ // third chance: try to receive window instead of object or child
+ result = AccessibleObjectFromEvent(e.HWnd, 0, 0, out iacc, out child);
+
if (result != 0) throw new Exception("AccessibleObjectFromPoint returned " + result);
return new SystemAccessibleObject(iacc, (int)child);
}
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From: <sch...@us...> - 2015-12-08 22:10:08
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Revision: 131
http://sourceforge.net/p/mwinapi/code/131
Author: schierlm
Date: 2015-12-08 22:10:07 +0000 (Tue, 08 Dec 2015)
Log Message:
-----------
added property 'HookFlags' to 'AccessibleEventListener'
% pushed from GitHub
% Author: fk <enoon1 at arcor.de>
% Date: Fri Dec 4 12:08:31 2015 +0100
Modified Paths:
--------------
trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs
Modified: trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs
===================================================================
--- trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs 2015-07-07 15:14:52 UTC (rev 130)
+++ trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs 2015-12-08 22:10:07 UTC (rev 131)
@@ -27,6 +27,7 @@
/// <summary>
/// Listens to events from the Windows accessibility system. These events are useful
/// if you want to write a screenreader or similar program.
+ /// For more information search the MSDN-documentation for the keyword 'WinEvents'.
/// </summary>
public class AccessibleEventListener : Component
{
@@ -43,6 +44,7 @@
private GCHandle gch;
private UInt32 processId = 0;
private UInt32 threadId = 0;
+ private AccessibleEventFlags hookFlags = AccessibleEventFlags.OUTOFCONTEXT;
/// <summary>
/// Initializes a new instance of this class with the specified container.
@@ -119,6 +121,30 @@
set { threadId = value; updateListener(); }
}
+ /// <summary>
+ /// The location of the hook function and of the events to be skipped.
+ /// </summary>
+ public AccessibleEventFlags HookFlags
+ {
+ get { return hookFlags; }
+ set
+ {
+ if (!(
+ value == AccessibleEventFlags.INCONTEXT ||
+ value == AccessibleEventFlags.OUTOFCONTEXT ||
+ value == (AccessibleEventFlags.OUTOFCONTEXT | AccessibleEventFlags.SKIPOWNPROCESS) ||
+ value == (AccessibleEventFlags.OUTOFCONTEXT | AccessibleEventFlags.SKIPOWNTHREAD) ||
+ value == (AccessibleEventFlags.INCONTEXT | AccessibleEventFlags.SKIPOWNPROCESS) ||
+ value == (AccessibleEventFlags.INCONTEXT | AccessibleEventFlags.SKIPOWNTHREAD)
+ ))
+ {
+ throw new ArgumentException("Invalid flags.");
+ }
+ hookFlags = value;
+ updateListener();
+ }
+ }
+
private void updateListener()
{
if (handle != IntPtr.Zero)
@@ -128,7 +154,7 @@
}
if (enabled)
{
- handle = SetWinEventHook(min, max, IntPtr.Zero, internalDelegate, processId, threadId, 0);
+ handle = SetWinEventHook(min, max, IntPtr.Zero, internalDelegate, processId, threadId, (uint)hookFlags);
}
}
@@ -292,7 +318,33 @@
}
}
+
/// <summary>
+ /// This enumeration lists Flag values that specify the location of the hook function and of the events to be skipped.
+ /// </summary>
+ [Flags]
+ public enum AccessibleEventFlags
+ {
+
+ /// <summary>
+ /// The callback function is not mapped into the address space of the process that generates the event.
+ /// </summary>
+ OUTOFCONTEXT = 0x0000,
+ /// <summary>
+ /// Prevents this instance of the hook from receiving the events that are generated by the thread that is registering this hook.
+ /// </summary>
+ SKIPOWNTHREAD = 0x0001,
+ /// <summary>
+ /// Prevents this instance of the hook from receiving the events that are generated by threads in this process. This flag does not prevent threads from generating events.
+ /// </summary>
+ SKIPOWNPROCESS = 0x0002,
+ /// <summary>
+ /// The DLL that contains the callback function is mapped into the address space of the process that generates the event.
+ /// </summary>
+ INCONTEXT = 0x0004
+ }
+
+ /// <summary>
/// This enumeration lists known accessible event types.
/// </summary>
public enum AccessibleEventType
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From: <sch...@us...> - 2015-12-08 22:10:16
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Revision: 132
http://sourceforge.net/p/mwinapi/code/132
Author: schierlm
Date: 2015-12-08 22:10:13 +0000 (Tue, 08 Dec 2015)
Log Message:
-----------
removed INCONTEXT from AccessibleEventFlags because this mode was not needed and not tested
% pushed from GitHub
% Author: fk <enoon1 at arcor.de>
% Date: Tue Dec 8 11:22:13 2015 +0100
Modified Paths:
--------------
trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs
Modified: trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs
===================================================================
--- trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs 2015-12-08 22:10:07 UTC (rev 131)
+++ trunk/ManagedWinapi/Accessibility/AccessibleObjectListener.cs 2015-12-08 22:10:13 UTC (rev 132)
@@ -130,12 +130,9 @@
set
{
if (!(
- value == AccessibleEventFlags.INCONTEXT ||
value == AccessibleEventFlags.OUTOFCONTEXT ||
value == (AccessibleEventFlags.OUTOFCONTEXT | AccessibleEventFlags.SKIPOWNPROCESS) ||
- value == (AccessibleEventFlags.OUTOFCONTEXT | AccessibleEventFlags.SKIPOWNTHREAD) ||
- value == (AccessibleEventFlags.INCONTEXT | AccessibleEventFlags.SKIPOWNPROCESS) ||
- value == (AccessibleEventFlags.INCONTEXT | AccessibleEventFlags.SKIPOWNTHREAD)
+ value == (AccessibleEventFlags.OUTOFCONTEXT | AccessibleEventFlags.SKIPOWNTHREAD)
))
{
throw new ArgumentException("Invalid flags.");
@@ -337,11 +334,7 @@
/// <summary>
/// Prevents this instance of the hook from receiving the events that are generated by threads in this process. This flag does not prevent threads from generating events.
/// </summary>
- SKIPOWNPROCESS = 0x0002,
- /// <summary>
- /// The DLL that contains the callback function is mapped into the address space of the process that generates the event.
- /// </summary>
- INCONTEXT = 0x0004
+ SKIPOWNPROCESS = 0x0002
}
/// <summary>
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