[python-win32] Creating python com objects

[Alex Denham]

Thats excellent Tim, I was just about to start digging around for information on how to get the data once it's dropped.

Thanks for your help
Alex

> Date: Fri, 25 Apr 2008 17:16:34 +0100
> From: mail at timgolden.me.uk
> CC: python-win32 at python.org
> Subject: Re: [python-win32] Creating python com objects
> 
> Well, for those of you still watching this show (!) and
> just in case anyone comes along in the future with the
> same question, I attach below a small working example
> which will accept one or more files dropped onto its
> Window. It doesn't do anything with the files, bar pull
> their names from the relevant data structure, but that's
> up to the specific application.
> 
> Many thanks to Roger for the critical info to get this
> working and to Alex for asking the question which started
> it off.
> 
> TJG
> 
> <code>
> import os, sys
> import win32gui
> import win32con
> import pythoncom
> import win32com.server.policy
> from win32com.shell import shell, shellcon
> 
> # clsid generated by pythoncom.CreateGuid ()
> CLSID = '{89DD545A-2C83-4103-AFE3-6CEB7FF5ECA4}'
> PROGID = "Tim.DropTarget"
> DESC = "Drop target handler for Tim"
> 
> class DropTarget (win32com.server.policy.DesignatedWrapPolicy):
>    _reg_clsid_ = CLSID
>    _reg_progid_ = PROGID
>    _reg_desc_ = DESC
>    _public_methods_ = ['DragEnter', 'DragOver', 'DragLeave', 'Drop']
>    _com_interfaces_ = [pythoncom.IID_IDropTarget]
> 
>    def __init__ (self, hWnd):
>      self._wrap_ (self)
>      self.hWnd = hWnd
> 
>    def DragEnter (self, data_object, key_state, point, effect):
>      if data_object.QueryGetData ((15, None, 1, -1, 1)):
>        return shellcon.DROPEFFECT_COPY
>      else:
>        return shellcon.DROPEFFECT_NONE
>    def DragOver (self, key_state, point, effect):
>      pass
>    def DragLeave (self):
>      pass
>    def Drop (self, data_object, key_state, point, effect):
>      data = data_object.GetData ((15, None, 1, -1, 1))
>      n_files = shell.DragQueryFileW (data.data_handle, -1)
>      filenames = [
>        shell.DragQueryFileW (data.data_handle, n_file) \
>          for n_file in range (n_files)
>      ]
> 
> def create_window ():
>    def OnDestroy (hwnd, msg, wparam, lparam):
>      win32gui.PostQuitMessage (0)
> 
>    wc = win32gui.WNDCLASS ()
>    hinst = win32gui.GetModuleHandle(None)
>    wc.lpszClassName = "DragDrop"
>    wc.style = win32con.CS_VREDRAW | win32con.CS_HREDRAW;
>    wc.hCursor = win32gui.LoadCursor (0, win32con.IDC_ARROW)
>    wc.hbrBackground = win32con.COLOR_WINDOW
>    wc.lpfnWndProc = {win32con.WM_DESTROY : OnDestroy}
>    classAtom = win32gui.RegisterClass (wc)
>    style = win32con.WS_VISIBLE | win32con.WS_OVERLAPPED \
>      | win32con.WS_SYSMENU
>    return win32gui.CreateWindow (
>      classAtom,
>      "Drag & Drop demo",
>      style,
>      0, 0, 100, 100,
>      0, 0, hinst, None
>    )
> 
> if __name__ == '__main__':
>    pythoncom.OleInitialize ()
>    hWnd = create_window ()
>    drop_target = DropTarget (hWnd)
>    pythoncom.RegisterDragDrop (
>      hWnd,
>      pythoncom.WrapObject (
>        drop_target,
>        pythoncom.IID_IDropTarget,
>        pythoncom.IID_IDropTarget
>      )
>    )
>    win32gui.PumpMessages ()
> 
> </code>
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