Implement fallback for detection of pylon install folder via registry…

… on windows platforms.

setup.py

@@ -528,7 +528,22 @@ def __init__(self):
 
         self.PylonDevDir = os.environ.get("PYLON_DEV_DIR")
         if not self.PylonDevDir:
-            raise EnvironmentError("PYLON_DEV_DIR is not set")
+            # Fallback, try to locate pylon installation via registry key
+            import winreg
+            hkey_local_machine_reg = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE)
+            try:
+                pylon_registry_key = winreg.OpenKey(hkey_local_machine_reg, r'SOFTWARE\Basler\pylon')
+                pylon_install_folder = winreg.QueryValue(pylon_registry_key, "InstallationFolder")
+                # Check if install folder contain "Development" folder.
+                pylon_dev_dir = os.path.join(pylon_install_folder, "Development")
+                if os.path.exists(pylon_dev_dir):
+                    self.PylonDevDir = pylon_dev_dir
+            except EnvironmentError:
+                pass
+            # Throw exception if registry fallback failed.
+            if not self.PylonDevDir:
+                raise EnvironmentError("PYLON_DEV_DIR is not set")
+
         self.LibraryDirs = [
             os.path.join(
                 self.PylonDevDir,