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changeset: 104125:3031e4a95131 branch: 3.6 parent: 104122:08119dc47cff parent: 104124:11c3d6a8f5fd user: Berker Peksag berker.peksag@gmail.com date: Wed Sep 28 17:07:40 2016 +0300 files: Doc/library/ctypes.rst description: Issue #21903: Merge from 3.5 diff -r 08119dc47cff -r 3031e4a95131 Doc/library/ctypes.rst --- a/Doc/library/ctypes.rst Wed Sep 28 07:44:46 2016 +0300 +++ b/Doc/library/ctypes.rst Wed Sep 28 17:07:40 2016 +0300 @@ -1672,32 +1672,30 @@ 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, - LPCSTR lpCaption, + LPCWSTR lpText, + LPCWSTR lpCaption, UINT uType); 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 /berker.peksag@gmail.com