Added try/catch blocks to the constructors of GUI window objects.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402521

examples/bayes_net_gui_ex.cpp

@@ -171,7 +171,7 @@ int WINAPI WinMain (HINSTANCE, HINSTANCE, PSTR cmds, int)
 
 main_window::
 main_window(
-) : 
+) try : 
     color_non_evidence(0,0,0),
     color_default_bg(255,255,255),
     color_evidence(100,200,100),
@@ -261,7 +261,7 @@ main_window(
     // to all arrange themselves correctly in our window.
     no_node_selected();
     on_window_resized();
-}
+} catch (...) { close_window(); } // make sure close_window() is called if something throws 
 
 // ----------------------------------------------------------------------------------------
 

examples/gui_api_ex.cpp

@@ -100,7 +100,7 @@ class win : public drawable_window
     */
 public:
     win(
-    ) :
+    ) try :
         c(*this),
         b(*this),
         cb(*this,rectangle(100,100,200,200),0,0,255), // the color_box will be blue and 101 pixels wide and tall
@@ -144,7 +144,7 @@ public:
 
         set_title("dlib gui example");
         show();
-    }
+    } catch (...) { close_window(); } // make sure close window is called if something throws 
 
     ~win(
     )

examples/image_ex.cpp

@@ -33,7 +33,7 @@ public:
     template <typename image_type>
     win(
         const image_type& img
-    ) :
+    ) try :
         gui_img(*this)
     {
         // set the size of this window to match the size of the input image
@@ -46,7 +46,7 @@ public:
 
         // show this window on the screen
         show();
-    }
+    } catch (...) { close_window(); } // make sure close_window() is called if something throws
 
     ~win(
     )
@@ -76,7 +76,7 @@ int main(int argc, char** argv)
         }
 
         // Here we open the image file.  Note that when you open a binary file with 
-        // the C++ ifstream you must suplly the ios::binary flag.
+        // the C++ ifstream you must supply the ios::binary flag.
         ifstream fin(argv[1],ios::binary);
         if (!fin)
         {