diff --git a/modules/cnn_3dobj/samples/demo_sphereview_data.cpp b/modules/cnn_3dobj/samples/demo_sphereview_data.cpp
index d5e530b57..db7043940 100755
--- a/modules/cnn_3dobj/samples/demo_sphereview_data.cpp
+++ b/modules/cnn_3dobj/samples/demo_sphereview_data.cpp
@@ -112,8 +112,8 @@ int main(int argc, char *argv[])
     int ite_depth = parser.get<int>("ite_depth");
     String plymodel = parser.get<String>("plymodel");
     String imagedir = parser.get<String>("imagedir");
-    string labeldir = parser.get<String>("labeldir");
-    String bakgrdir = parser.get<string>("bakgrdir");
+    String labeldir = parser.get<String>("labeldir");
+    String bakgrdir = parser.get<String>("bakgrdir");
     int label_class = parser.get<int>("label_class");
     int label_item = parser.get<int>("label_item");
     float cam_head_x = parser.get<float>("cam_head_x");
@@ -218,8 +218,7 @@ int main(int argc, char *argv[])
         }
     }
     std::fstream imglabel;
-    char* p=(char*)labeldir.data();
-    imglabel.open(p, fstream::app|fstream::out);
+    imglabel.open(labeldir.c_str(), fstream::app|fstream::out);
     bool camera_pov = true;
     /* Create a window using viz. */
     viz::Viz3d myWindow("Coordinate Frame");
@@ -227,7 +226,7 @@ int main(int argc, char *argv[])
     myWindow.setWindowSize(Size(image_size,image_size));
     /* Set background color. */
     myWindow.setBackgroundColor(viz::Color::gray());
-    myWindow.spin();
+    myWindow.spinOnce();
     /* Create a Mesh widget, loading .ply models. */
     viz::Mesh objmesh = viz::Mesh::load(plymodel);
     /* Get the center of the generated mesh widget, cause some .ply files, this could be ignored if you are using PASCAL database*/
@@ -249,7 +248,7 @@ int main(int argc, char *argv[])
     cam_y_dir.x = cam_head_x;
     cam_y_dir.y = cam_head_y;
     cam_y_dir.z = cam_head_z;
-    char* temp = new char;
+    char temp[1024];
     std::vector<String> name_bkg;
     if (bakgrdir.size() != 0)
     {