Vbscript Sendkeys not working in some applications - vbscript

Question

I recently google around and found that tools like CCleaner can be automated to Scan and Fix Regsitry errors by VBScript or AutoIt scripts.
As I prefer native tools and libraries, so I created a VBScript to automate the Registry Cleaning process(not upto the last button click, as there are too many buttons for that to be automatable), which is as below:
On Error Resume Next
Set WshShell = WScript.CreateObject("WScript.Shell")
Set UsrEnvDmn = WshShell.Environment("User")
UsrEnvDmn("CclnrInstDir") = "C:\Program Files\CCleaner"
WshShell.Run """%CclnrInstDir%\\CCleaner64.exe"" /Registry"
WScript.Sleep 1000 : WshShell.AppActivate "CCleaner"
WScript.Sleep 2000 : WshShell.SendKeys "%s"
WScript.Sleep 5000 : WshShell.SendKeys "%f"
Set WshShell = Nothing : Set UsrEnvDmn = Nothing
But the problem is once CCLeaner opens and comes into focus, the Sendkeys function isn't clicking/selecting any buttons or options in the window. If I press manually Alt + s then the Scan process indeed starts, but I badly need to automate that thing, if possible upto the very end of registry cleanup process.
Can anyone guide on this ?

Answer 1

See the remarks section of SetForegroundWindow. Your script has to comply with at least one of those rules when you use AppActivate (as this is what AppActivate calls). You keep sleeping and losing the right to set the foreground window. See CCleaner documentation on a better way https://www.ccleaner.com/docs/ccleaner/advanced-usage/command-line-parameters
The system restricts which processes can set the foreground window. A
process can set the foreground window only if one of the following
conditions is true:
•The process is the foreground process.
•The process was started by the foreground process.
•The process received the last input event.
•There is no foreground process.
•The process is being debugged.
•The foreground process is not a Modern Application or the Start
Screen.
•The foreground is not locked (see LockSetForegroundWindow).
•The foreground lock time-out has expired (see
SPI_GETFOREGROUNDLOCKTIMEOUT in SystemParametersInfo).
•No menus are active.