I'm trying to convert the C code for TaskScheduler COM to rust, and currently stuck with the VARIANT argument of ITaskService::Connect:

    //  Create an instance of the Task Service.
    let mut p_service: *mut ITaskService = unsafe { std::mem::zeroed() };

    let hr = unsafe {
      CoCreateInstance(
        &TaskScheduler::uuidof(),
        ptr::null_mut(),
        CLSCTX_IN

I tried using the ScreenToClient and ClientToScreen methods in WinApi/WinApi/Windows/NativeWindow.cs because I thought they did the same thing as the Windows functions of the same name. But, after getting unexpected results, I noticed that the methods had AdjustWindowRectEx/InverseAdjustWindowRectEx calls in them as well, which results in something other than a simple client/screen coord