Windows7 RC Multitouch API changes from the beta version

April 15, 2009

In these days we are upgrading the Windows7 Integration Library sample code. Most of the APIs have not changed but even the smallest API change can break existing applications. In this post I’d like to note the Win32 native Multi-touch API changes. The first change is that WM_TOUCHDOWN, WM_TOUCHMOVE and WM_TOUCHUP Windows messages are gone and one WM_TOUCH message replaces them. This is a good idea. Usually touch messages are coalesced, which means that you get many different messages (There are many fingers) at the same time in one WM_TOUCH Windows message. Before the change it was common...
no comments