[Tutor] ctypes wintypes
mysecretrobotfactory at gmail.com
Fri Oct 6 17:06:50 EDT 2017
buffer = ctypes.byref(ctypes.create_string_buffer(4))
On Fri, Oct 6, 2017 at 1:55 PM, eryk sun <eryksun at gmail.com> wrote:
> On Fri, Oct 6, 2017 at 9:12 PM, Michael C
> <mysecretrobotfactory at gmail.com> wrote:
> > How do I create a buffer, or rather, is a buffer just a variable?
> A buffer is a block of memory for an I/O operation. For example, if
> you need to read a 4-byte (32-bit) integer at an address in another
> process, the 'buffer' could be ctypes.c_int32(). In general, to read
> an arbitrary-sized block of memory, use ctypes.create_string_buffer()
> to create a char array.
> > How do I create a pointer to it?
> Pass it byref().
> > print('mbi.State: ',mbi.State)
> Check whether mbi.State is MEM_COMMIT before trying to read it. If
> it's MEM_FREE or MEM_RESERVE, then ReadProcessMemory will fail.
> > buffer = ctypes.create_string_buffer(4)
> > bufferSize = (ctypes.sizeof(buffer))
> > ReadProcessMemory = Kernel32.ReadProcessMemory
> > if ReadProcessMemory(Process, ctypes.byref(mbi), buffer, bufferSize,
> > print('buffer is: ',buffer)
> > else:
> > print('something is wrong')
> Don't print "something is wrong". You're capturing the thread's last
> error value, so use it to raise an informative exception. For example:
> if not success:
> raise ctypes.WinError(ctypes.get_last_error())
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