I have a little Python 3.3 script that successfully sends (SendMessage) a WM_COPYDATA message (inspired from here , works with XYplorer):
import win32api
import win32gui
import struct
import array
def sendScript(window, message):
CopyDataStruct = "IIP"
dwData = 0x00400001 #value required by XYplorer
buffer = array.array("u", message)
cds = struct.pack(CopyDataStruct, dwData, buffer.buffer_info()[1] * 2 + 1, buffer.buffer_info()[0])
win32api.SendMessage(window, 0x004A, 0, cds) #0x004A is the WM_COPYDATA id
message = "helloworld"
sendScript(window, message) #I write manually the hwnd during debug
Now I need to write a receiver script, still in Python. The script in this answer seems to work (after correcting all the print statements in a print() form). Seems because it prints out all properties of the received message (hwnd, wparam, lparam, etc) except the content of the message.
I get an error instead, UnicodeEncodeError. More specifically,
Python WNDPROC handler failed
Traceback (most recent call last):
File "C:\Python\xxx.py", line 45, in OnCopyData
print(ctypes.wstring_at(pCDS.contents.lpData))
File "C:\Python\python-3.3.2\lib\encodings\cp850.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 10-13: character maps to <undefined>
I don't know how to fix it, also because I'm not using "fancy" characters in the message so I really can't see why I get this error. I also tried setting a different length of message in print(ctypes.wstring_at(pCDS.contents.lpData)) as well as using simply string_at, but without success (in the latter case I obtain a binary string).
