补充调整：设备离线时扫描单张，状态栏增加提示

app/scanner2/mainwindow.cpp

@@ -679,8 +679,27 @@ void MainWindow::on_AcquireInto2()
     HGResult ret = HGBASE_ERR_FAIL;
     if (nullptr != m_devUser)
     {
+        bool deviceIsOnline = true;
         ret = m_devUser->StartScan();
-        if (HGBASE_ERR_OK != ret)
+#if defined(HG_CMP_MSC)
+
+        if (HGTWAIN_ERR_DEVICEOFFLINE == ret)
+        {
+            deviceIsOnline = false;
+        }
+#else
+        if (HGSANE_ERR_DEVICEOFFLINE == ret)
+        {
+            deviceIsOnline = false;
+        }
+#endif
+
+        if (!deviceIsOnline)
+        {
+            deleteDevUser();
+        }
+
+        if (HGBASE_ERR_OK != ret && deviceIsOnline)
         {
             on_scanFinishEvent();
         }
@@ -1391,7 +1410,32 @@ void MainWindow::on_scanFinishEvent()
             else
                 ret = m_devUser->StartScan();
 
-            if (HGBASE_ERR_OK != ret)
+            bool deviceIsOnline = true;
+            ret = m_devUser->StartScan();
+#if defined(HG_CMP_MSC)
+
+            if (HGTWAIN_ERR_DEVICEOFFLINE == ret)
+            {
+                deviceIsOnline = false;
+            }
+#else
+            if (HGSANE_ERR_DEVICEOFFLINE == ret)
+            {
+                deviceIsOnline = false;
+            }
+#endif
+
+            if (!deviceIsOnline)
+            {
+                if (ScanType_SingleScanToCache == m_scanType)
+                {
+                    QMessageBox::information(this, tr("Prompt"), tr("Device is offline"));
+                }
+
+                deleteDevUser();
+            }
+
+            if (HGBASE_ERR_OK != ret && deviceIsOnline)
             {
                 on_scanFinishEvent();
             }
@@ -3458,9 +3502,29 @@ void MainWindow::on_act_acquireSingle_triggered()
     HGResult ret = HGBASE_ERR_FAIL;
     if (nullptr != m_devUser)
     {
+        bool deviceIsOnline = true;
         ret = m_devUser->StartSingleScan();
         
-        if (HGBASE_ERR_OK != ret)
+#if defined(HG_CMP_MSC)
+
+        if (HGTWAIN_ERR_DEVICEOFFLINE == ret)
+        {
+            deviceIsOnline = false;
+        }
+#else
+        if (HGSANE_ERR_DEVICEOFFLINE == ret)
+        {
+            deviceIsOnline = false;
+        }
+#endif
+
+        if (!deviceIsOnline)
+        {
+            QMessageBox::information(this, tr("Prompt"), tr("Device is offline"));
+            deleteDevUser();
+        }
+
+        if (HGBASE_ERR_OK != ret && deviceIsOnline)
         {
             on_scanFinishEvent();
         }
@@ -3513,8 +3577,27 @@ void MainWindow::on_act_acquireInto_triggered()
         HGResult ret = HGBASE_ERR_FAIL;
         if (nullptr != m_devUser)
         {
+            bool deviceIsOnline = true;
             ret = m_devUser->StartScan();
-            if (HGBASE_ERR_OK != ret)
+#if defined(HG_CMP_MSC)
+
+            if (HGTWAIN_ERR_DEVICEOFFLINE == ret)
+            {
+                deviceIsOnline = false;
+            }
+#else
+            if (HGSANE_ERR_DEVICEOFFLINE == ret)
+            {
+                deviceIsOnline = false;
+            }
+#endif
+
+            if (!deviceIsOnline)
+            {
+                deleteDevUser();
+            }
+
+            if (HGBASE_ERR_OK != ret && deviceIsOnline)
             {
                 on_scanFinishEvent();
             }
@@ -3582,8 +3665,27 @@ void MainWindow::on_act_insertFromScanner_triggered()
         HGResult ret = HGBASE_ERR_FAIL;
         if (nullptr != m_devUser)
         {
+            bool deviceIsOnline = true;
             ret = m_devUser->StartScan();
-            if (HGBASE_ERR_OK != ret)
+#if defined(HG_CMP_MSC)
+
+            if (HGTWAIN_ERR_DEVICEOFFLINE == ret)
+            {
+                deviceIsOnline = false;
+            }
+#else
+            if (HGSANE_ERR_DEVICEOFFLINE == ret)
+            {
+                deviceIsOnline = false;
+            }
+#endif
+
+            if (!deviceIsOnline)
+            {
+                deleteDevUser();
+            }
+
+            if (HGBASE_ERR_OK != ret && deviceIsOnline)
             {
                 on_scanFinishEvent();
             }

modules/twain_user/HGTwainImpl.cpp

@@ -664,12 +664,22 @@ HGResult HGTwainDSImpl::EnableWithSingleScan(HWND parent, HGDSEventFunc eventFun
     HGResult ret = GetCapInt(CAP_XFERCOUNT, &oldXferCount);
     if (HGBASE_ERR_OK != ret)
     {
+        TW_STATUS status;
+        m_dsmImpl->m_pDSMProc(&m_dsmImpl->m_AppId, &m_iden, DG_CONTROL, DAT_STATUS, MSG_GET, (TW_MEMREF)&status);
+        if (status.ConditionCode == TWCC_CHECKDEVICEONLINE)
+            return HGTWAIN_ERR_DEVICEOFFLINE;
+
         return ret;
     }
 
     ret = SetCapInt(CAP_XFERCOUNT, TWTY_INT16, 1);
     if (HGBASE_ERR_OK != ret)
     {
+        TW_STATUS status;
+        m_dsmImpl->m_pDSMProc(&m_dsmImpl->m_AppId, &m_iden, DG_CONTROL, DAT_STATUS, MSG_GET, (TW_MEMREF)&status);
+        if (status.ConditionCode == TWCC_CHECKDEVICEONLINE)
+            return HGTWAIN_ERR_DEVICEOFFLINE;
+
         return ret;
     }
 
@@ -678,6 +688,11 @@ HGResult HGTwainDSImpl::EnableWithSingleScan(HWND parent, HGDSEventFunc eventFun
     twUI.hParent = (TW_HANDLE)parent;
     if (TWRC_SUCCESS != m_dsmImpl->m_pDSMProc(&m_dsmImpl->m_AppId, &m_iden, DG_CONTROL, DAT_USERINTERFACE, MSG_ENABLEDS, (TW_MEMREF)&twUI))
     {
+        TW_STATUS status;
+        m_dsmImpl->m_pDSMProc(&m_dsmImpl->m_AppId, &m_iden, DG_CONTROL, DAT_STATUS, MSG_GET, (TW_MEMREF)&status);
+        if (status.ConditionCode == TWCC_CHECKDEVICEONLINE)
+            return HGTWAIN_ERR_DEVICEOFFLINE;
+
         return HGTWAIN_ERR_FAIL;
     }