/*
* closeDSM
*
* Close the data source manager
*/
int
closeDSM(pTW_SESSION twSession)
{
if (DSM_IS_CLOSED(twSession)) {
LogMessage("closeDSM: Source Manager not open\n");
return FALSE;
} else {
if (DS_IS_OPEN(twSession)) {
LogMessage("closeDSM: Can't close source manager with open source\n");
return FALSE;
} else {
twSession->twRC = callDSM(APP_IDENTITY(twSession), NULL,
DG_CONTROL, DAT_PARENT, MSG_CLOSEDSM,
(TW_MEMREF)&(twSession->hwnd));
if (twSession->twRC != TWRC_SUCCESS) {
LogMessage("CloseDSM failure -- %s\n", currentTwainError(twSession));
}
else {
/* We are now in state 2 */
twSession->twainState = 2;
}
}
}
/* Let the caller know what happened */
return (twSession->twRC==TWRC_SUCCESS);
}
/*
* 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);
}
/*
* openDS
*
* Open a data source using the TWAIN user interface.
*/
int
openDS(pTW_SESSION twSession)
{
TW_IDENTITY *dsIdentity;
/* The datasource manager must be open */
if (DSM_IS_CLOSED(twSession)) {
LogMessage("openDS: Cannot open data source... manager closed\n");
return FALSE;
}
/* Is the data source already open? */
if (DS_IS_OPEN(twSession)) {
LogMessage("openDS: Data source already open\n");
return TRUE;
}
/* Open the TWAIN datasource */
dsIdentity = DS_IDENTITY(twSession);
twSession->twRC = callDSM(APP_IDENTITY(twSession), NULL,
DG_CONTROL, DAT_IDENTITY, MSG_OPENDS,
(TW_MEMREF) dsIdentity);
/* Check the return to determine what the user decided
* to do.
*/
switch (twSession->twRC) {
case TWRC_SUCCESS:
/* We are now in TWAIN state 4 */
twSession->twainState = 4;
LogMessage("Data source %s opened\n", DS_IDENTITY(twSession)->ProductName);
LogMessage("\tVersion.MajorNum = %d\n", dsIdentity->Version.MajorNum);
LogMessage("\tVersion.MinorNum = %d\n", dsIdentity->Version.MinorNum);
LogMessage("\tVersion.Info = %s\n", dsIdentity->Version.Info);
LogMessage("\tProtocolMajor = %d\n", dsIdentity->ProtocolMajor);
LogMessage("\tProtocolMinor = %d\n", dsIdentity->ProtocolMinor);
LogMessage("\tManufacturer = %s\n", dsIdentity->Manufacturer);
LogMessage("\tProductFamily = %s\n", dsIdentity->ProductFamily);
return TRUE;
break;
default:
LogMessage("Error \"%s\" opening data source\n", currentTwainError(twSession));
break;
}
return FALSE;
}
