Python3k ctypes printf

Answer 1

The first argument needs to be a byte string as well:

msvcrt.printf(b"%s", string)

The return value of printf is the number of characters printed, which should be 12 in this case.

Edit:

If you want the string to be returned instead of printed, you can use sprintf instead. This is dangerous and NOT recommended.

s = ctypes.create_string_buffer(100)   #must be large enough!!
msvcrt.sprintf(s, b'%s', b'Hello World!')
val = s.value

I don't know why you'd want to do this though, since Python has its own string formatting. sprintf is a dangerous method since it is susceptible to buffer overflows.