C# app using C++ ShowWindow() call fails on Win10 IOT 1809 build 17763.6775 put works on other Win10 1809 17763.107

Question

C# app using C++ ShowWindow() call fails on Win10 IOT 1809 build 17763.6775 put works on other Win10 1809 17763.107

McBean-Meir, Adrian (DI MC GMC MF-CON OPS FF2 EN) 0

I am getting the handle of an application using its title string. The using that handle to use ShowWindow(). This works on win7 and some win10 but fails to work on Win10 IOT 1809 build 17763.6775. Does anyone have any ideas to what could block it. I have read about issues with local and service accounts, but unsure.

RLWA32 50,071 Reputation points

2025-08-07T13:26:02.37+00:00

One possible reason for ShowWindow to fail is if the call is trying to manipulate the window of a high integrity process from a process with a lower integrity level. The Windows User Interface Privilege Isolation security mechanism prevents such manipulation. Most interactive processes running without Administrator privileges run at the medium integrity level.

Without knowing specifics, I can't suggest a better reason than that above.

Your answer

RLWA32 50,071 Reputation points

2025-08-07T13:26:02.37+00:00

One possible reason for ShowWindow to fail is if the call is trying to manipulate the window of a high integrity process from a process with a lower integrity level. The Windows User Interface Privilege Isolation security mechanism prevents such manipulation. Most interactive processes running without Administrator privileges run at the medium integrity level.

Without knowing specifics, I can't suggest a better reason than that above.

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C# app using C++ ShowWindow() call fails on Win10 IOT 1809 build 17763.6775 put works on other Win10 1809 17763.107

Your answer