.NET
Microsoft Technologies based on the .NET software framework.
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UI Automation throws COMException
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(246.4, 76%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EVK%3C/text%3E%3C/svg%3E)
Varun Kumar
6
Reputation points
Documentation for UI Automation does not mention anything about COMException. However, I encountered the below exception:
System.Runtime.InteropServices.COMException
à System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32, IntPtr)
à MS.Internal.Automation.UiaCoreApi.CheckError(Int32)
à MS.Internal.Automation.UiaCoreApi.UiaGetUpdatedCache(MS.Internal.Automation.SafeNodeHandle, UiaCacheRequest, NormalizeState, System.Windows.Automation.Condition)
à System.Windows.Automation.AutomationElement.Normalize(System.Windows.Automation.Condition, System.Windows.Automation.CacheRequest)
à System.Windows.Automation.TreeWalker.Normalize(System.Windows.Automation.AutomationElement)
What are the possible reasons for such exceptions? The documentation for UI Automation does not mention anything about COMExceptions and so it not clear that whether these exception should be handled or not.
.NET
C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
10,309 questions
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(233.6, 28.999999999999996%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXZ%3C/text%3E%3C/svg%3E)
Xingyu Zhao-MSFT 5,356 Reputation points2022-01-24T01:32:16.933+00:00 Hi @Varun Kumar ，
Could you provide more details and which line of the code throw the exception? It will help us analyze the question.
We are waiting for your update. -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(246.4, 85%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYW%3C/text%3E%3C/svg%3E)
Yang, Wade 0 Reputation points2023-10-18T20:15:13.1966667+00:00 I have the same question. When calling AutomationElement.setFacus(), I got System.Runtime.InteropServices.COMException with the following message and stacktrace:
Failed to open the process handle at
System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo) at
MS.Internal.Automation.UiaCoreApi.CheckError(Int32 hr) at
System.Windows.Automation.AutomationElement.SetFocus()
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