与 UAC 的屏幕键盘交互

Question

I have created a winforms onscreen keyboard in C# with visual studio however this will not work when the UAC (User Account Control) window comes up so an administrator is unable to use their login details for specific troubleshooting areas.

I have tried using the following which work everywhere but none will work with the UAC window, these do not type anything;

SendKeys
user32.dll keybd_event function
InputSimulator

Any help much appreciated.

Answer 1

The UAC prompt will not open on the current desktop, but in the brand-new Secure Desktop, it will suspend any currently open desktop.
It is intentional, because the program is not allowed to interact with this dialog box.

There is one exception: "Trusted SYSTEM processes can run on a secure desktop", so you can refer to the following materials.
Ease of Access registry details
UI Automation Security Overview