DWORD a = 0x29E7028; // CUserLocal: 8B 3D ? ? ? ? 8B 40
DWORD b = 0x1DF85E0; // E8 ? ? ? ? 8D ? ? ? ? ? ? ? 89 ? ? ? ? ? E8 ? ? ? ? DB [FUNCTION START] (push esi)

//For fucks sake, give those propper names

//Some global variable
auto YourFunc = reinterpret_cast<void(__thiscall*)(void * instance, int pid, int x, int)>(a);

//call it like this
YourFunc (*b, pID, x, y);