BOOL WOW32DriverCallback(dwCallback, dwFlags, wDeviceHandle, wMsg, dwUser,
dwParam1, dwParam2)
DWORD dwCallback;
DWORD dwFlags;
WORD wDeviceHandle;
WORD wMsg;
DWORD dwUser;
DWORD dwParam1;
DWORD dwParam2;
WOW32DriverCallback allows a 32-bit thunk extension DLL to simulate a Multimedia hardware interrupt callback into 16-bit code. The built-in thunks for wave, midi, and time callbacks make use of this function to callback into 16-bit application code.
Parameters
dwCallback
Specifies either the address of a callback function, a window handle, or a task handle, depending on the flags specified in dwFlags.
dwFlags
Specifies how the 16-bit client application is notified, according to one of the following flags:
| Flag | Meaning |
| DCB_FUNCTION | Indicates that a message should be sent to a callback function. dwCallback must be a 16-bit address of the 16-bit application callback routine. |
| DCB_WINDOW | Indicates that a message should be sent to the 16-bit window handle specified in dwCallback. |
| DCB_TASK | Indicates that a message should be sent ot the 16-bit task handle specified in dwCallback. |
wDeviceHandle
Specifies a 16-bit handle of the device associated with the notification.
wMsg
Specifies a message to be sent to the application.
dwUser
Specifies the DWORD of user-instance data supplied by the application when the device was opened.
dwParam1
Specifies a message-dependent parameter. If this is a pointer, it must be mapped to a valid 16-bit address. All fields in the structure pointed to must be mapped correctly.
dwParam2
Specifies a message-dependent parameter. If this is a pointer, it must be mapped to a valid 16-bit address. All fields in the structure pointed to must be mapped correctly.
Return Value
WOW32DriverCallback returns TRUE if the operation was successful.
Comments
The 16-bit client specifies how it is notified when the device is opened. If notification is accomplished with a callback function, wDeviceHandle, wMsg, dwUser, dwParam1, and dwParam2 are passed to the callback. If notification is accomplished by means of a window, only wMsg, wDeviceHandle, and dwParam1 are passed.
Users will have to dynamically link to this function.
See Also
WOW32ResolveHandle