有“设备”功能的app，设置项增加不支持弹窗提示

app/scanner/hg_settingdialog.cpp

@@ -887,7 +887,16 @@ void hg_settingdialog::slot_checkedClicked()
     m_list_IdValueTitle.append(QPair<QPair<int, QVariant>, QString>(QPair<int, QVariant>(id, checkBoxcurrentState), md5(opt->title)));
 
     SANE_Int method = 0;
-    sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, &checkBoxcurrentState, &method);
+    SANE_Status ret = sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, &checkBoxcurrentState, &method);
+    if (ret == SANE_STATUS_UNSUPPORTED)
+    {
+        SANE_Bool value = false;
+        ret = sane_control_option(m_handle, id, SANE_ACTION_GET_VALUE, &value, &method);
+        checkBox->setCheckState(value ? Qt::Checked : Qt::Unchecked);
+        QMessageBox::information(this, tr("Prompt"), tr("The funtion is unsupported"));
+        return;
+    }
+
     if((method & SANE_INFO_RELOAD_OPTIONS) == SANE_INFO_RELOAD_OPTIONS)
         updateUIStatus();
     else if(method & SANE_INFO_INEXACT)
@@ -941,7 +950,19 @@ void hg_settingdialog::slot_string_list_comboBoxClicked()
         *((SANE_Fixed*)buf) = SANE_FIX(atof(comboBoxcurrentItem.c_str()));
     else
         strcpy(buf, comboBoxcurrentItem.c_str());
-    sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, buf, &method);
+    SANE_Status ret = sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, buf, &method);
+    if (ret == SANE_STATUS_UNSUPPORTED)
+    {
+        char* value = (char*)malloc(opt->size * 2 + 4);
+        ret = sane_control_option(m_handle, id, SANE_ACTION_GET_VALUE, value, &method);
+        if (value != nullptr)
+            comboBox->setCurrentText(QString::fromStdString(value));
+        free(value);
+
+        QMessageBox::information(this, tr("Prompt"), tr("The funtion is unsupported"));
+        return;
+    }
+
     if((method & SANE_INFO_RELOAD_OPTIONS) == SANE_INFO_RELOAD_OPTIONS)
         updateUIStatus();
     else if(method & SANE_INFO_INEXACT)
@@ -966,7 +987,13 @@ void hg_settingdialog::slot_pushButtonClicked()
             after = 0;
 
     // restore to default setting ?
-    sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, NULL, &after);
+    SANE_Status ret = sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, NULL, &after);
+    if (ret == SANE_STATUS_UNSUPPORTED)
+    {
+        QMessageBox::information(this, tr("Prompt"), tr("The funtion is unsupported"));
+        return;
+    }
+
     if((after & SANE_INFO_RELOAD_OPTIONS) == SANE_INFO_RELOAD_OPTIONS)
         updateUIStatus();
 
@@ -1194,7 +1221,18 @@ void hg_settingdialog::slot_word_list_comboBoxClicked(int value)
 
 
     SANE_Int method = 0;
-    sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, &temp, &method);
+    SANE_Status ret = sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, &temp, &method);
+    if (ret == SANE_STATUS_UNSUPPORTED)
+    {
+        char* value = (char*)malloc(opt->size * 2 + 4);
+        ret = sane_control_option(m_handle, id, SANE_ACTION_GET_VALUE, value, &method);
+        if (value != nullptr)
+            comboBox->setCurrentText(QString::fromStdString(value));
+        free(value);
+
+        QMessageBox::information(this, tr("Prompt"), tr("The funtion is unsupported"));
+        return;
+    }
     if((method & SANE_INFO_RELOAD_OPTIONS) == SANE_INFO_RELOAD_OPTIONS)
         updateUIStatus();
     else if(method & SANE_INFO_INEXACT)
@@ -1250,7 +1288,25 @@ void hg_settingdialog::slot_sliderClicked(int value)
 
             m_list_IdValueTitle.append(QPair<QPair<int, QVariant>, QString>(QPair<int, QVariant>(id, temp), md5(opt->title)));
         }
-        sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, &val, &method);
+        SANE_Status ret = sane_control_option(m_handle, id, SANE_ACTION_SET_VALUE, &val, &method);
+        if (ret == SANE_STATUS_UNSUPPORTED)
+        {
+            if (!db_val)
+            {
+                SANE_Int value = 0;
+                ret = sane_control_option(m_handle, id, SANE_ACTION_GET_VALUE, &value, &method);
+                slider->setValue(value);
+            }
+            else
+            {
+                SANE_Fixed value = 0;
+                ret = sane_control_option(m_handle, id, SANE_ACTION_GET_VALUE, &value, &method);
+                slider->setValue(value);
+            }
+
+            QMessageBox::information(this, tr("Prompt"), tr("The funtion is unsupported"));
+            return;
+        }
         if((method & SANE_INFO_RELOAD_OPTIONS) == SANE_INFO_RELOAD_OPTIONS)
             updateUIStatus();
         else if(method & SANE_INFO_INEXACT)