From 0cd76f899b234af77cf0cd57bfab45b43dee2bb0 Mon Sep 17 00:00:00 2001
From: Davis King <davis@dlib.net>
Date: Wed, 18 May 2016 22:22:56 -0400
Subject: [PATCH] Added an error message if a camera isn't available.

---
 examples/webcam_face_pose_ex.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/examples/webcam_face_pose_ex.cpp b/examples/webcam_face_pose_ex.cpp
index 81887384b..dbbf83047 100644
--- a/examples/webcam_face_pose_ex.cpp
+++ b/examples/webcam_face_pose_ex.cpp
@@ -42,6 +42,12 @@ int main()
     try
     {
         cv::VideoCapture cap(0);
+        if (!cap.isOpened())
+        {
+            cerr << "Unable to connect to camera" << endl;
+            return 1;
+        }
+
         image_window win;
 
         // Load face detection and pose estimation models.