Thomas Heller schrieb:
> "g.franzkowiak" <[EMAIL PROTECTED]> writes:
>
>
>>Thomas Heller schrieb:
>>
>>>"g.franzkowiak" <[EMAIL PROTECTED]> writes:
>>>
>>>
>>>
>>>>Hello everybody,
>>>>
>>>>I've tryed to use an interprocess communication via
>>>>SendMessage on Windows.
>>>>Unfortunately, nothing goes on
>>>>
>>>>#########################################################################
>>>>#! /usr/bin/env python
>>>>
>>>>import win32api, win32ui, win32con
>>>>import struct, array
>>>>
>>>>"""
>>>>typedef struct tagCOPYDATASTRUCT { // cds
>>>> DWORD dwData;
>>>> DWORD cbData;
>>>> PVOID lpData;
>>>>} COPYDATASTRUCT;
>>>>"""
>>>>
>>>>def packCopyData(nNum, sString):
>>>> int_buffer = array.array("L",[nNum])
>>>> char_buffer = array.array('c', sString)
>>>> int_buffer_address = int_buffer.buffer_info()[0]
>>>> char_buffer_address = char_buffer.buffer_info()[0]
>>>> char_buffer_size = char_buffer.buffer_info()[1]
>>>> copy_struct = struct.pack("pLp", # dword*, dword, char*
>>>> int_buffer_address,
>>>> char_buffer_size,
>>>> char_buffer)
>>>> return copy_struct
>>>
>>>
>>>After packCopyData(...) returns, the arrays are destroyed, which will
>>>probably void their contents. You must keep them alive until you don't
>>>need the COPYDATASTRUCT instance any longer. For this kind of stuff,
>>>ctypes may be easier to use than pywin32.
>>>
>>>Thomas
>>
>>Hmm, have read something in <<http://aspn.activestate.com>>
>>and the script changed to this:
>>
>>#---------------------------------------------------------
>>#! /usr/bin/env python
>>
>>import win32api, win32ui, win32con, win32gui
>>import struct, array
>>from ctypes import *
>>
>>"""
>>typedef struct tagCOPYDATASTRUCT { // cds
>> DWORD dwData;
>> DWORD cbData;
>> PVOID lpData;
>>} COPYDATASTRUCT;
>>"""
>>
>>class COPYDATATYPE(Structure):
>> _fields_ = [("nNum", c_ulong),
>> ("szData", c_char_p)]
>>
>>class COPYDATASTRUCT(Structure):
>> _fields_ = [("dwData", c_ulong),
>> ("cbData", c_ulong),
>> ("lpData", POINTER(COPYDATATYPE))]
>>
>># get the window handle
>>hwnd = win32ui.FindWindow(None, "target window")
>>
>># print just for fun
>># ##print hwnd
>>
>># prepare copydata structure for sending data
>>cpyData = COPYDATATYPE(1, '1')
>>cds = COPYDATASTRUCT(c_ulong(1),
>> c_ulong(sizeof(cpyData)),
>> pointer(cpyData))
>>
>># try to send a message
>>win32api.SendMessage(hwnd,
>> win32con.WM_COPYDATA,
>> 0,
>> pointer(cds))
>>
>>#---------------------------------------------------------
>>and the message for the last line is:
>>==> TypeError: an integer is required"
>>
>>This message comes with "pointer(cds)" and with "addressof(cds)"
>
>
> That error refers to the first argument - win32ui.FindWindow returns a
> PyCWnd object, which is not accepted by win32api.SendMessage.
> Changing this brings you one step further. win32api.SendMessage accepts
> an integer for the last element, so addressof(cds) should work now.
>
> win32gui.SendMessage is more tolerant in what it accepts as 4th
> argument, according to the error message you get when you try it it
> expects a string, a buffer, or an integer. So you could use addressof()
> or pointer(), what you like best.
>
> Thomas
Super, operates :-))
My last answer must be in the Nirvana, strange ?
Ok, only the version with 'addressof' generates a message and I must
play with the data types. The receiver becomes a wrong data formate.
Expect (int=1, char[256]='1\00'), but the int is 0x31 and the string
somewhat. Must play with my data.
Thanks
gerd
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