Source.Python forums

from cvars import ConVar
from memory import find_binary
from memory.hooks import PreHook
from memory import find_binary, Convention, DataType

tier0lib = find_binary('tier0')

DevMsg = tier0lib['?DevMsg@@YAXPBDZZ'].make_function(
    Convention.CDECL,
    [
        DataType.POINTER
    ],
    DataType.VOID
)

Msg = tier0lib['Msg'].make_function(
    Convention.CDECL,
    [
        DataType.POINTER
    ],
    DataType.VOID
)

@PreHook(DevMsg)
def PreDevMsg(args):
    if ConVar('developer').get_int() > 0:
        Msg(args[0])
    return 0