joySetCapture function

The joySetCapture function captures a joystick by causing its messages to be sent to the specified window.

Syntax

MMRESULT joySetCapture(
  HWND hwnd,
  UINT uJoyID,
  UINT uPeriod,
  BOOL fChanged
);

Parameters

hwnd

Handle to the window to receive the joystick messages.

uJoyID

Identifier of the joystick to be captured. Valid values for uJoyID range from zero (JOYSTICKID1) to 15.

uPeriod

Polling frequency, in milliseconds.

fChanged

Change position flag. Specify TRUE for this parameter to send messages only when the position changes by a value greater than the joystick movement threshold. Otherwise, messages are sent at the polling frequency specified in uPeriod.

Return Value

Returns JOYERR_NOERROR if successful or one of the following error values.

Return code Description
MMSYSERR_NODRIVER
The joystick driver is not present.
MMSYSERR_INVALPARAM
Invalid joystick ID or hwnd is NULL.
JOYERR_NOCANDO
Cannot capture joystick input because a required service (such as a Windows timer) is unavailable.
JOYERR_UNPLUGGED
The specified joystick is not connected to the system.
JOYERR_PARMS
Invalid joystick ID or hwnd is NULL.

Remarks

If the specified joystick is currently captured, the function returns undefined behavior. Call the joyReleaseCapture function to release the captured joystick, or destroy the window to release the joystick automatically.

Requirements

   
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header joystickapi.h (include Windows.h)
Library Winmm.lib
DLL Winmm.dll

See Also

Joysticks

Multimedia Joystick Functions