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copied!<p>This is much easier to do with ctypes. This code has been tested with a simple Delphi application that receives and displays the string that is sent via <code>WM_COPYDATA</code>.</p> <pre><code>import win32con import ctypes import ctypes.wintypes FindWindow = ctypes.windll.user32.FindWindowW SendMessage = ctypes.windll.user32.SendMessageW class COPYDATASTRUCT(ctypes.Structure): _fields_ = [ ('dwData', ctypes.wintypes.LPARAM), ('cbData', ctypes.wintypes.DWORD), ('lpData', ctypes.c_wchar_p) #formally lpData is c_void_p, but we do it this way for convenience ] hwnd = FindWindow('TheNameOfMyWindowClass', None) cds = COPYDATASTRUCT() cds.dwData = 0 str = 'boo' cds.cbData = ctypes.sizeof(ctypes.create_unicode_buffer(str)) cds.lpData = ctypes.c_wchar_p(str) SendMessage(hwnd, win32con.WM_COPYDATA, 0, ctypes.byref(cds)) </code></pre> <p>This assumes that the recipient expects a UTF-16 encoded payload. If the recipient is expecting ANSI encoded payload then you need to use this variant.</p> <pre><code>import win32con import ctypes import ctypes.wintypes FindWindow = ctypes.windll.user32.FindWindowW SendMessage = ctypes.windll.user32.SendMessageW class COPYDATASTRUCT(ctypes.Structure): _fields_ = [ ('dwData', ctypes.wintypes.LPARAM), ('cbData', ctypes.wintypes.DWORD), ('lpData', ctypes.c_char_p) #formally lpData is c_void_p, but we do it this way for convenience ] hwnd = FindWindow('TheNameOfMyWindowClass', None) cds = COPYDATASTRUCT() cds.dwData = 0 str = b'boo' cds.cbData = ctypes.sizeof(ctypes.create_string_buffer(str)) cds.lpData = ctypes.c_char_p(str) SendMessage(hwnd, win32con.WM_COPYDATA, 0, ctypes.byref(cds)) </code></pre> <hr> <p>Now, looking at the Stickies link that you posted, you need to use the ANSI variant. If you want to receive notification, you'll need to pass a window handle in you SendMessage call instead of 0 as above.</p>

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