From a7e180a5db1980b422463cf15db700255f4650f8 Mon Sep 17 00:00:00 2001
From: ser1zw <azariahsawtikes@gmail.com>
Date: Thu, 21 Jul 2011 23:14:12 +0900
Subject: [PATCH] added error handling to Curve methods

---
 ext/opencv/curve.cpp | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/ext/opencv/curve.cpp b/ext/opencv/curve.cpp
index 024a3e5..8a506a8 100644
--- a/ext/opencv/curve.cpp
+++ b/ext/opencv/curve.cpp
@@ -95,9 +95,16 @@ rb_arc_length(int argc, VALUE *argv, VALUE self)
 {
   VALUE slice, is_closed;
   rb_scan_args(argc, argv, "02", &slice, &is_closed);
-  return rb_float_new(cvArcLength(CVARR(self),
-				  NIL_P(slice) ? CV_WHOLE_SEQ : VALUE_TO_CVSLICE(slice),
-				  TRUE_OR_FALSE(is_closed, -1)));
+  double length = 0;
+  try {
+    length = cvArcLength(CVARR(self),
+			 NIL_P(slice) ? CV_WHOLE_SEQ : VALUE_TO_CVSLICE(slice),
+			 TRUE_OR_FALSE(is_closed, -1));
+  }
+  catch (cv::Exception& e) {
+    raise_cverror(e);
+  }
+  return rb_float_new(length);
 }
 
 __NAMESPACE_END_CURVE