Issue attachments for pydot/pydot-ng#65: https://github.com/pydot/pydot-ng/issues/65

windows_exec_search.patch

Index: pydot.py
===================================================================
--- pydot.py	(revision 29)
+++ pydot.py	(working copy)
@@ -539,11 +539,33 @@
             
             path = os.path.join(os.environ['PROGRAMFILES'], 'ATT', 'GraphViz', 'bin')
             
+            # All the recent versions of GraphViz append a version number
+            # Check the directory of PROGRAMFILES until you see Graphviz
+            if not os.path.exists(path):
+                for dir in os.listdir(os.environ['PROGRAMFILES']):
+                    if 'Graphviz' in dir:
+                        path = os.path.join(os.environ['PROGRAMFILES'], dir, 'bin')
+                        break
+            
         else:
         
             #Just in case, try the default...
             path = r"C:\Program Files\att\Graphviz\bin"
             
+            # Check Program Files
+            if not os.path.exists(path):
+                for dir in os.listdir(r"C:\Program Files"):
+                    if 'Graphviz' in dir:
+                        path = os.path.join(r"C:\Program Files", dir, 'bin')
+                        break
+            
+            # Check Program Files (x86)
+            if not os.path.exists(path):
+                for dir in os.listdir(r"C:\Program Files (x86)"):
+                    if 'Graphviz' in dir:
+                        path = os.path.join(r"C:\Program Files (x86)", dir, 'bin')
+                        break
+            
         progs = __find_executables(path)
         
         if progs is not None :