cpython: cb55aedcc7e8 (original) (raw)

--- a/Doc/library/ctypes.rst +++ b/Doc/library/ctypes.rst @@ -1672,32 +1672,30 @@ different ways, depending on the type an The optional third item is the default value for this parameter. -This example demonstrates how to wrap the Windows MessageBoxA function so +This example demonstrates how to wrap the Windows MessageBoxW function so that it supports default parameters and named arguments. The C declaration from the windows header file is this:: WINUSERAPI int WINAPI

MessageBoxA(

MessageBoxW( HWND hWnd,

```
  LPCSTR lpText,[](#l1.16)
```
```
  LPCSTR lpCaption,[](#l1.17)
```

```
  LPCWSTR lpText,[](#l1.18)
```

  LPCWSTR lpCaption,[](#l1.19)
  UINT uType);[](#l1.20)

Here is the wrapping with :mod:ctypes:: >>> from ctypes import c_int, WINFUNCTYPE, windll

from ctypes.wintypes import HWND, LPCSTR, UINT
prototype = WINFUNCTYPE(c_int, HWND, LPCSTR, LPCSTR, UINT)
paramflags = (1, "hwnd", 0), (1, "text", "Hi"), (1, "caption", None), (1, "flags", 0)
MessageBox = prototype(("MessageBoxA", windll.user32), paramflags)
-

-The MessageBox foreign function can now be called in these ways::

from ctypes.wintypes import HWND, LPCWSTR, UINT
prototype = WINFUNCTYPE(c_int, HWND, LPCWSTR, LPCWSTR, UINT)
paramflags = (1, "hwnd", 0), (1, "text", "Hi"), (1, "caption", "Hello from ctypes"), (1, "flags", 0)
MessageBox = prototype(("MessageBoxW", windll.user32), paramflags) +

+The MessageBox foreign function can now be called in these ways:: >>> MessageBox() >>> MessageBox(text="Spam, spam, spam") >>> MessageBox(flags=2, text="foo bar")

A second example demonstrates output parameters. The win32 GetWindowRect function retrieves the dimensions of a specified window by copying them into