An emulated function calls a Windows import that has no handler

Symptoms

pe32_emu stops with "the routine called KERNEL32.dll!GetTickCount, which has no handler (pass stubs={...})".

Cause

The emulator points every import at a stub that stops the run with the import's name, so a routine never runs off into Windows code that is not there. The routine called one.

What to do

Give the import a handler that returns what the measurement needs: Emu32('GAME.EXE', stubs={'GetTickCount': lambda emu: 1000}). A handler reads the call's arguments with emu.arg(i). For a library routine whose effect you only need to see (sprintf, printf), stop at the call with until= and read its arguments instead. Record each stub's fixed answer next to the measurement, since it is an input.