How to switch a process between default desktop and Winlogon desktop?
c++, windows, winlogon
Solution
You did the right thing: `SetThreadDesktop` is correct. The error is telling you that you have some resources open on the current desktop though, such as a window, and that prevents you from switching. If you had tried to produce a minimal test-case (as you are meant to do when asking questions here!) you would have found that out.
Cut out parts of your program until you find the chunk that's preventing you switching desktop. Some Windows APIs are nasty and prevent you switching desktop, so need to be called in a dedicated thread.
Problem
I am writing a remote desktop application like TeamViewer in C++ on Windows 7 (x64) and Windows 8 (x64). 1. What made me stuck I have implemented the mouse input and keyboard input by using SendInput(). I found SendInput() worked perfectly when the process ran under `winsta0\desktop`. But after the user locked the computer or the screensaver launched, it didn’t work. If I run the process under `winsta0\winlogon`, `SendInput()` doesn’t work under `winsta0\default`. 2. What I have tried I have tried using SetThreadDesktop() to switch the process from `winsta0\desktop` to `winsta0\winlogon`, but I got error 170: "The requested resource is in use" and I stucked. 3. What I want to know I noticed that TeamViewer has a process named `TeamViewer_Desktop.exe` which can control mouse and keyboard under Winlogon, Default and Screensaver. How does it do it? Can you provide the code to help me understand how to solve my question? I want to know** how I can make my application switch between the default desktop and Winlogon desktop. So I can control the mouse and keyboard on a secured desktop without creating another process running under `winlogon.exe`.