How do I enumerate the display devices in a multi-monitor system?
Enumeration can be performed through a simple iteration by the application using methods of the IDirect3D9 interface. Call GetAdapterCount to determine the number of display adapters in the system. Call GetAdapterMonitor to determine which physical monitor an adapter is connected to (this method returns an HMONITOR, which you can then use in the Win32 API GetMonitorInfo to determine information about the physical monitor). Determining the characteristics of a particular display adapter or creating a Direct3D device on that adapter is as simple as passing the appropriate adapter number in place of D3DADAPTER_DEFAULT when calling GetDeviceCaps, CreateDevice, or other methods.
