Could anyone help me how to make this hack

I got DevC++ then i put this code and when i compiled it it and then theres a red line in #include "dll.h" and it says include dllmain.cpp plesae help !!!!!

#include "dll.h"
#include <windows.h>

{
DWORD pointer1 = *(PDWORD)PlayerBase;
if(!pointer1)
return;
(*(PDWORD)(pointer1 + 0x1A20C)) = 4999; // 4999 sp is Limited not 15000 its sp not exp
}

We need more information..
And where's the function or dllmain?

I have no idea.