diff --git a/src/MeasureDeviceController.cpp b/src/MeasureDeviceController.cpp
index 3840551..789b811 100644
--- a/src/MeasureDeviceController.cpp
+++ b/src/MeasureDeviceController.cpp
@@ -10,7 +10,7 @@ typedef int* DeviceHandler;
 static sDeviceList s_device_list;
 
 static DeviceHandler GetDeviceHandler(const QString &device_guid) {
-    DeviceHandler device_handler = DeviceHandler(0x01);
+    DeviceHandler device_handler = nullptr;
     for (int i = 0; i < s_device_list.totalNum; i++) {
         sDeviceInfo di;
         int ret = GetDeviceInfo(s_device_list.pHandle[i], &di,-1,-1);
@@ -56,7 +56,19 @@ void MeasureDeviceController::InitFindMeasureDevice()
 
     int ret = FindDeviceAsync(&fdc, onFindDeviceFinishedCallback);
     if (ret != 1) {
-        QLOG_ERROR() << QStringLiteral(u"调用测量设备失败:[返回代码%1]").arg(ret);
+        QLOG_ERROR() << QStringLiteral(u"调用查找测量设备失败:[返回代码%1]").arg(ret);
+    }
+}
+
+void MeasureDeviceController::DisconnectMeasureDevice(const QString &device_guid)
+{
+    DeviceHandler device_handler = GetDeviceHandler(device_guid);
+    if (!device_handler) {
+        return;
+    }
+    int ret = CloseDevice(device_handler);
+    if (ret != 1) {
+        QLOG_ERROR() << QStringLiteral(u"断开测量设备失败:[返回代码%1]").arg(ret);
     }
 }
 
@@ -240,7 +252,7 @@ QString MeasureDeviceController::GetMeasureGvfDataFilename()
         return QString();
     }
     QList<QString> gvf_file_list = measure_gvf_data_dir.entryList(QDir::Files|QDir::NoSymLinks|QDir::NoDotAndDotDot, QDir::Time);
-    for (const QString& gvf_filename : gvf_file_list) {
+    foreach (const QString& gvf_filename , gvf_file_list) {
         QFileInfo measure_gvf_data_file_info(measure_gvf_data_dir.filePath(gvf_filename));
         if (measure_gvf_data_file_info.exists()) {
             if ( measure_gvf_data_file_info.suffix() != QString("gvf") )
diff --git a/src/MeasureDeviceController.h b/src/MeasureDeviceController.h
index 22f386f..6c73672 100644
--- a/src/MeasureDeviceController.h
+++ b/src/MeasureDeviceController.h
@@ -23,6 +23,7 @@ public:
     virtual ~MeasureDeviceController();
 
     void InitFindMeasureDevice();
+    void DisconnectMeasureDevice(const QString &device_guid);
     bool SetDeviceMeasureConfigParams(const QString& device_guid, int board_id, int channel_id, const QVariantMap &cfg_params);
     bool StartMeasure(const QString& device_guid, int board_id, int channel_id);
     bool StopMeasure(const QString& device_guid, int board_id, int channel_id);