int CTwain::DropToState(int nS, HWND hwnd)
{
hwnd = DefWnd(hwnd);
while (nState > nS) {
switch (nState) {
case TRANSFERRING:
if (!EndXfer()) return FALSE;
break;
case TRANSFER_READY:
if (!CancelXfers()) return FALSE;
break;
case SOURCE_ENABLED:
if (!DisableSource()) return FALSE;
break;
case SOURCE_OPEN:
if (!CloseSource()) return FALSE;
break;
case SOURCE_MANAGER_OPEN:
if (!CloseSourceManager(hwnd)) return FALSE;
break;
case SOURCE_MANAGER_LOADED:
if (!UnloadSourceManager()) return FALSE;
break;
default:
ATLASSERT(FALSE);
} // switch
} // while
return TRUE;
}
/*
Closes the Data Source
*/
void CTwain::CloseDS()
{
if(DSOpen())
{
DisableSource();
CallTwainProc(&m_AppId,NULL,DG_CONTROL,DAT_IDENTITY,MSG_CLOSEDS,(TW_MEMREF)&m_Source);
m_bDSOpen = FALSE;
}
}
int CTwain::CloseSource(void)
{
rc = TWRC_SUCCESS;
if (nState == SOURCE_ENABLED) {
DisableSource();
}
if (nState == SOURCE_OPEN) {
DS(DG_CONTROL, DAT_IDENTITY, MSG_CLOSEDS, &SourceId);
if (nState == SOURCE_OPEN && bTrace) ATLTRACE(_T("TWAIN:CloseSource failed.\n"));
}
return (nState < SOURCE_OPEN);
} // CloseSource
/*
Ends the current transfer.
Returns TRUE if the more images are pending
*/
BOOL CTwain::EndTransfer()
{
TW_PENDINGXFERS twPend;
if(CallTwainProc(&m_AppId,&m_Source,DG_CONTROL,DAT_PENDINGXFERS,MSG_ENDXFER,(TW_MEMREF)&twPend))
{
if (twPend.Count == 0)
{
DisableSource();
_bHasNextPic = FALSE;
}
else
_bHasNextPic = TRUE;
TRACE("********** EndTransfer --> twPend.Count = %d ************\n", twPend.Count);
return twPend.Count != 0;
}
return FALSE;
}
