Test and fix in the ctypes backend for calling "void *" functions with a

Python string argument.

1 files changed, 7 insertions, 5 deletions

diff --git a/cffi/backend_ctypes.py b/cffi/backend_ctypes.py
index 40a84ed..6975d9e 100644
--- a/cffi/backend_ctypes.py
+++ b/cffi/backend_ctypes.py
@@ -491,6 +491,8 @@ class CTypesBackend(object):
         elif BItem in (getbtype(model.PrimitiveType('signed char')),
                        getbtype(model.PrimitiveType('unsigned char'))):
             kind = 'bytep'
+        elif BItem is getbtype(model.void_type):
+            kind = 'voidp'
         else:
             kind = 'generic'
         #
@@ -546,13 +548,13 @@ class CTypesBackend(object):
             def __setitem__(self, index, value):
                 self._as_ctype_ptr[index] = BItem._to_ctypes(value)
 
-            if kind == 'charp':
+            if kind == 'charp' or kind == 'voidp':
                 @classmethod
-                def _arg_to_ctypes(cls, value):
-                    if isinstance(value, bytes):
-                        return ctypes.c_char_p(value)
+                def _arg_to_ctypes(cls, *value):
+                    if value and isinstance(value[0], bytes):
+                        return ctypes.c_char_p(value[0])
                     else:
-                        return super(CTypesPtr, cls)._arg_to_ctypes(value)
+                        return super(CTypesPtr, cls)._arg_to_ctypes(*value)
 
             if kind == 'charp' or kind == 'bytep':
                 def _to_string(self, maxlen):