| DirectX SDK | 
The IDirectInputDevice7::SetDataFormat method sets the data format for the DirectInput device.
HRESULT SetDataFormat( LPCDIDATAFORMAT lpdf );
If the method succeeds, the return value is DI_OK.
If the method fails, the return value can be one of the following error values:
| DIERR_ACQUIRED | 
| DIERR_INVALIDPARAM | 
| DIERR_NOTINITIALIZED | 
The data format must be set before the device can be acquired by using the IDirectInputDevice7::Acquire method. It is necessary to set the data format only once. The data format cannot be changed while the device is acquired.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dinput.h.
  Import Library: Use dinput.lib.