Activate Button in other application

i wan to active start button in other app, i u开发者_JS百科se spy ++ to check the button styles, i c bs_pushbutton. i try to use win api to do it.i tried WM_SETFOCUS and enter key to do it, but fail

these is my code

    Dim hwnd As Int32 = apiFindWindowEx(HWND_DESKTOP, 0, Nothing, "Open File -     Security Warning")
    Dim cwnd As Int32 = apiFindWindowEx(hwnd, 0, Nothing, "&Run")
    Dim i As Integer = SendMessage(cwnd, BS_PUSHBUTTON, 0, 0)

i declare BS_PUSHBUTTON = &H1& it is correct value for BS_PUSHBUTTON ???

how can i run the app button event??

It's unclear exactly what you're asking for in this question. I'm not sure whether you're attempting to enable a button or emulate a click to it.

Anyway, for the former you simply need to use EnableWindow():

EnableWindow( cwnd, true );

Or alternatively:

Button_Enable( cwnd, true );

For the latter you can use SetActiveWindow() and BM_CLICK:

SetActiveWindow( hwnd );
SendMessage( cwnd, BM_CLICK, 0, 0 );