afx_msg void OnActivateApp( BOOL bActive, HANDLE hTask );
bActive
Specifies whether the CWnd is being activated or deactivated. TRUE means the CWnd is being activated. FALSE means the CWnd is being deactivated.
hTask
Specifies a task handle. If bActive is TRUE, the handle identifies the task that owns the CWnd being deactivated. If bActive is FALSE, the handle identifies the task that owns the CWnd being activated.
Called when CWnd is about to be activated and CWnd belongs to a different task than the currently active window. OnActivateApp is called for all top-level windows of the task being activated, and for all top-level windows of the task being deactivated.
This message-handler member function calls the Default member function. Override this member function in your derived class to handle the WM_ACTIVATEAPP message.
CWnd::Default, WM_ACTIVATEAPP