sending message to another app

I guess first i should ask how to get the window into HWnd

Ok now i have this and seems to work.

CWnd* cwnd = FindWindow(NULL,"Setup - Spybot - Search & Destroy");
CWnd* TButton = cwnd->GetDlgItem(0x0008031A); // this is the next button id

so now can i use sendmessage or postmessage to click the button, I'm so close i can feel it.

I meant BN_CLICKED. I Did search the forum, and i got the answer, but sad to say it is not working. I'm getting an error when it gets to sendmessage. here is the code.

CWnd *cwnd = FindWindow(NULL,"Setup - Spybot - Search & Destroy");
CWnd *button = cwnd->GetDlgItem(0x0008031A);
button->SendMessage(BN_CLICKED,1,0);

I checked the return value of getdlgitem and its giving me a 0. So basically it's null.
But the button does exist and that is the control id.
Why is it giving me a null when it does exist?

Yes it is unusual for the control id to vary, but it certainly can. Are you sure that is what is happening? You can use Spy++ to be sure. If that is happening, then the program is doing things differently from most programs, but otherwise it is not strange or whatever.

I am not sure what the best solution is, but probably you can use FindWindow again, using the parent window and the button text for the window text.

I searched my source code and found my sample of sending a BN_CLICKED. Yours will vary but this should be close enough.WPARAM WParam = MAKEWPARAM(IDCANCEL, BN_CLICKED);
GetParent()->PostMessage(WM_COMMAND, WParam, NULL);