How can I simulate a button click given the handle to the button's window?
Send a BM_CLICK
message to the HWND of the button:
SendMessage(hButton, BM_CLICK, 0, 0);
That causes the button to receive WM_LBUTTONDOWN
and WM_LBUTTONUP
messages, and the parent to receive an BN_CLICKED
notification, as if the user had physically clicked on the button.
Find the handle to the button that you want to click (by using FindWindowEx
), and just send click message:
SendMessage(hButton, WM_LBUTTONDOWN, MK_LBUTTON, MAKELPARAM(0, 0));
SendMessage(hButton, WM_LBUTTONUP, MK_LBUTTON, MAKELPARAM(0, 0));
SendMessage(hParent, WM_COMMAND, MAKEWPARAM(IdOfButton, BN_CLICKED), (LPARAM)hwndOfButton);
Typically you can get away without the hwndOfButton
, if you don't know it - depends on the dialog's implementation!
It can be SendMessage
or PostMessage
, depending on your use case.