like this? buffer = ctypes.byref(ctypes.create_string_buffer(4))
On Fri, Oct 6, 2017 at 1:55 PM, eryk sun <eryk...@gmail.com> wrote: > On Fri, Oct 6, 2017 at 9:12 PM, Michael C > <mysecretrobotfact...@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, > None): > > 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()) > _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor