DIDEVCAPS Structure

Describes a Microsoft?DirectInput?device's capabilities. This structure is used with the IDirectInputDevice8::GetCapabilities method.

Syntax

typedef struct DIDEVCAPS {
    DWORD dwSize;
    DWORD dwFlags;
    DWORD dwDevType;
    DWORD dwAxes;
    DWORD dwButtons;
    DWORD dwPOVs;
    DWORD dwFFSamplePeriod;
    DWORD dwFFMinTimeResolution;
    DWORD dwFirmwareRevision;
    DWORD dwHardwareRevision;
    DWORD dwFFDriverVersion;
} DIDEVCAPS, *LPDIDEVCAPS;

Members

dwSize

Size of this structure, in bytes. This member must be initialized by the application before a call to the IDirectInputDevice8::GetCapabilities method.

dwFlags

Flags associated with the device. This value can be a combination of the following:

DIDC_ALIAS

The device is a duplicate of another DirectInput device. Alias devices are by default not enumerated by IDirectInput8::EnumDevices.

DIDC_ATTACHED

The device is physically attached.

DIDC_DEADBAND

The device supports deadband for at least one force-feedback condition.

DIDC_EMULATED

If this flag is set, the data is coming from a user mode device interface, such as a Human Interface Device (HID), or by some other ring 3 means. If it is not set, the data is coming directly from a kernel mode driver.

DIDC_FORCEFEEDBACK

The device supports force feedback.

DIDC_FFFADE

The force-feedback system supports the fade parameter for at least one effect. If the device does not support fade, the fade level and fade time members of the DIENVELOPE structure are ignored by the device.

After a call to the IDirectInputDevice8::GetEffectInfo method, an individual effect sets the DIEFT_FFFADE flag if fade is supported for that effect.

DIDC_FFATTACK

The force-feedback system supports the attack parameter for at least one effect. If the device does not support attack, the attack level and attack time members of the DIENVELOPE structure are ignored by the device.

After a call to the IDirectInputDevice8::GetEffectInfo method, an individual effect sets the DIEFT_FFATTACK flag if attack is supported for that effect.

DIDC_HIDDEN

Fictitious device created by a device driver so that it can generate keyboard and mouse events. Such devices are not normally enumerated by IDirectInput8::EnumDevices or configured by IDirectInput8::ConfigureDevices.

DIDC_PHANTOM

Placeholder. Phantom devices are by default not enumerated by IDirectInput8::EnumDevices.

DIDC_POLLEDDATAFORMAT

At least one object in the current data format is polled, rather than interrupt-driven. For these objects, the application must explicitly call the IDirectInputDevice8::Poll method to obtain data.

DIDC_POLLEDDEVICE

At least one object on the device is polled, rather than interrupt-driven. For these objects, the application must explicitly call the IDirectInputDevice8::Poll method to obtain data. HID devices can contain a mixture of polled and nonpolled objects.

DIDC_POSNEGCOEFFICIENTS

The force-feedback system supports two coefficient values for conditions (one for the positive displacement of the axis and one for the negative displacement of the axis) for at least one condition. If the device does not support both coefficients, the negative coefficient in the DICONDITION structure is ignored.

After a call to the IDirectInputDevice8::GetEffectInfo method, an individual condition sets the DIEFT_POSNEGCOEFFICIENTS flag if separate positive and negative coefficients are supported for that condition.

DIDC_POSNEGSATURATION

The force-feedback system supports a maximum saturation for both positive and negative force output for at least one condition. If the device does not support both saturation values, the negative saturation in the DICONDITION structure is ignored.

After a call to the IDirectInputDevice8::GetEffectInfo method, an individual condition sets the DIEFT_POSNEGSATURATION flag if separate positive and negative saturation are supported for that condition.

DIDC_SATURATION

The force-feedback system supports the saturation of condition effects for at least one condition. If the device does not support saturation, the force generated by a condition is limited only by the maximum force that the device can generate.

After a call to the IDirectInputDevice8::GetEffectInfo method, an individual condition sets the DIEFT_SATURATION flag if saturation is supported for that condition.

DIDC_STARTDELAY

The force-feedback system supports the start delay parameter for at least one effect. If the device does not support start delays, the dwStartDelay member of the DIEFFECT structure is ignored.

dwDevType

Device type specifier. This member can contain values identical to those in the dwDevType member of the DIDEVICEINSTANCE structure.

dwAxes

Number of axes available on the device.

dwButtons

Number of buttons available on the device.

dwPOVs

Number of point-of-view controllers available on the device.

dwFFSamplePeriod

Minimum time between playback of consecutive raw force commands, in microseconds.

dwFFMinTimeResolution

Minimum time, in microseconds, that the device can resolve. The device rounds any times to the nearest supported increment. For example, if the value of dwFFMinTimeResolution is 1000, the device would round any times to the nearest millisecond.

dwFirmwareRevision

Firmware revision of the device.

dwHardwareRevision

Hardware revision of the device.

dwFFDriverVersion

Version number of the device driver.

Remarks

The semantics of version numbers are left to the manufacturer of the device. The only guarantee is that newer versions have larger numbers.

Structure Information

Header	dinput.h
Minimum operating systems	Windows 98

See Also

DIDEVICEINSTANCE