?
im Thread
http://www.c-plusplus.net/forum/viewtopic-var-t-is-171009.html
gabs ne Lösung
HWND ParentWnd;
ParentWnd = FindWindow(NULL, "Rechner");
SetForegroundWindow(ParentWnd);
int hwnd=0;
HWND hwndChild;
if(ParentWnd == 0)
{
}
else
{
hwndChild = FindWindowEx(ParentWnd,0,"Button","1");
SendMessage(hwndChild, WM_LBUTTONDOWN, 0, 0);
SendMessage(hwndChild, WM_LBUTTONUP, 0, 0);
}