Index: Lib/ctypes/__init__.py
===================================================================
--- Lib/ctypes/__init__.py	(revision 54888)
+++ Lib/ctypes/__init__.py	(working copy)
@@ -226,6 +226,14 @@
 
 class c_char_p(_SimpleCData):
     _type_ = "z"
+    if _os.name == "nt":
+        def __repr__(self):
+            if not windll.kernel32.IsBadStringPtrA(self, -1):
+                return "%s(%r)" % (self.__class__.__name__, self.value)
+            return "%s(0x%X)" % (self.__class__.__name__, cast(self, c_void_p).value or 0)
+    else:
+        def __repr__(self):
+            return "%s(0x%X)" % (self.__class__.__name__, cast(self, c_void_p).value or 0)
 _check_size(c_char_p, "P")
 
 class c_void_p(_SimpleCData):