windows.winproxy.error.WinproxyError: VirtualAllocEx: [WinError 6] Invalid handle #93

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1. hakril commented on Nov 2, 2026

   

   hakril

   on Nov 2, 2026

   Owner

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   Hi,

   Thank you for the issue.
   From what I understand, it seems the error is in the default handle value you are trying to pass to the WinProcess constructor.
   The default (non-set) value for handle should be None and not 0 (https://github.com/hakril/PythonForWindows/blob/master/windows/winobject/process.py#L1061).

   Passing 0 will make WinProces use this handle for VirtualAllocEx which will results in Invalid handle.

   Example:

   >>> windows.WinProcess(pid=windows.current_process.pid).virtual_alloc(0x1000)
   2323953614848
   >>> windows.WinProcess(pid=windows.current_process.pid, handle=None).virtual_alloc(0x1000)
   2324023869440
   >>> windows.WinProcess(pid=windows.current_process.pid, handle=0).virtual_alloc(0x1000)
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File "c:\users\cleme\documents\projets\pythonforwindows\windows\winobject\process.py", line 1116, in virtual_alloc
       return winproxy.VirtualAllocEx(self.handle, lpAddress=addr, dwSize=size, flAllocationType=type, flProtect=prot)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "c:\users\cleme\documents\projets\pythonforwindows\windows\winproxy\apis\kernel32.py", line 277, in VirtualAllocEx
       return VirtualAllocEx.ctypes_function(hProcess, lpAddress, dwSize, flAllocationType, flProtect)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "c:\users\cleme\documents\projets\pythonforwindows\windows\winproxy\apiproxy.py", line 99, in perform_call
       return self._cprototyped(*args)
              ^^^^^^^^^^^^^^^^^^^^^^^^
     File "c:\users\cleme\documents\projets\pythonforwindows\windows\winproxy\error.py", line 49, in fail_on_zero
       raise WinproxyError(func_name)
   windows.winproxy.error.WinproxyError: VirtualAllocEx: [WinError 6] The handle is invalid.
   

   Hope this help !