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IDirectInputDevice8::GetDeviceState Method

  • Artículo

Retrieves immediate data from the device.

Syntax

HRESULT GetDeviceState(
         DWORD cbData,
         LPVOID lpvData
)

Parameters

  • cbData
    Size of the buffer in the lpvData parameter, in bytes.
  • lpvData
    Address of a structure that receives the current state of the device. The format of the data is established by a prior call to the IDirectInputDevice8::SetDataFormat method.

Return Value

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_INPUTLOST, DIERR_INVALIDPARAM, DIERR_NOTACQUIRED, DIERR_NOTINITIALIZED, E_PENDING.

Remarks

Before device data can be obtained, set the cooperative level by using the IDirectInputDevice8::SetCooperativeLevel method, then set the data format by using IDirectInputDevice8::SetDataFormat, and acquire the device by using the IDirectInputDevice8 Interface method.

The five predefined data formats require corresponding device state structures according to the following table:

Data format State structure
c_dfDIMouse DIMOUSESTATE
c_dfDIMouse2 DIMOUSESTATE2
c_dfDIKeyboard array of 256 bytes
c_dfDIJoystick DIJOYSTATE
c_dfDIJoystick2 DIJOYSTATE2

For example, if you passed the c_dfDIMouse format to the IDirectInputDevice8::SetDataFormat method, you must pass a DIMOUSESTATE structure to the IDirectInputDevice8::GetDeviceState method.

Requirements

Header: Declared in dinput.h.

See Also

IDirectInputDevice8::Poll
Polling and Event Notification
Buffered and Immediate Data