SendMessage is causing script to hang

Question

I am having an issue where the SendMessage() function is causing a script to hang and thus never exiting though it is running the SendMessage like it should (Its task comple

Answer 1

Short version of this script as a batch file command (put this line in a .bat file):

@powershell (Add-Type '[DllImport(\"user32.dll\")]^public static extern int PostMessage(int hWnd, int hMsg, int wParam, int lParam);' -Name a -Pas)::PostMessage(-1,0x0112,0xF170,2)

Answer 2

Please add

Add-Type -Assembly UIAutomationClient

and use

public static extern IntPtr PostMessage(int hWnd, UInt32 hMsg, Int32 wParam, Int32 lParam);

or

public static extern IntPtr SendMessage(int hWnd, UInt32 hMsg, Int32 wParam, Int32 lParam);

And the script will no longer crash

Answer 3

Change SendMessage to PostMessage. It worked for me.

The difference is that PostMessage is asynchronous and it doesn't have to wait for any response.