/*
* openDSM
*
* Open the data source manager
*/
int
openDSM(pTW_SESSION twSession)
{
/* Make sure that we aren't already open */
if (DSM_IS_OPEN(twSession))
return TRUE;
/* Open the data source manager */
twSession->twRC = callDSM(APP_IDENTITY(twSession), NULL,
DG_CONTROL, DAT_PARENT, MSG_OPENDSM,
(TW_MEMREF) &(twSession->hwnd));
/* Check the return code */
switch (twSession->twRC) {
case TWRC_SUCCESS:
/* We are now at state 3 */
twSession->twainState = 3;
return TRUE;
break;
case TWRC_FAILURE:
default:
LogMessage("OpenDSM failure\n");
break;
}
return FALSE;
}
/*
* TwainProcessMessage
*
* Returns TRUE if the application should process message as usual.
* Returns FALSE if the application should skip processing of this message
*/
int
TwainProcessMessage(LPMSG lpMsg, pTW_SESSION twSession)
{
TW_EVENT twEvent;
twSession->twRC = TWRC_NOTDSEVENT;
/* Only ask Source Manager to process event if there is a Source connected. */
if (DSM_IS_OPEN(twSession) && DS_IS_OPEN(twSession)) {
/*
* A Source provides a modeless dialog box as its user interface.
* The following call relays Windows messages down to the Source's
* UI that were intended for its dialog box. It also retrieves TWAIN
* messages sent from the Source to our Application.
*/
twEvent.pEvent = (TW_MEMREF) lpMsg;
twSession->twRC = callDSM(APP_IDENTITY(twSession), DS_IDENTITY(twSession),
DG_CONTROL, DAT_EVENT, MSG_PROCESSEVENT,
(TW_MEMREF) &twEvent);
/* Check the return code */
if (twSession->twRC == TWRC_NOTDSEVENT) {
return FALSE;
}
/* Process the message as necessary */
processTwainMessage(twEvent.TWMessage, twSession);
}
/* tell the caller what happened */
return (twSession->twRC == TWRC_DSEVENT);
}
