[2.4.3] Having trouble calling DoString from LUA

[pinny]

Warning: ASM noob here
Title had typo: Meant to say calling DoString from ASM not LUA

I know the offset for DoString is Wow.exe+306c80 (also 0x706c80 since tbc does not use ASLR)

I found a function which calls DoString at 0x495ECA
Here is what the function that calls DoString looks like


Here is what DoString looks like in 2.4.3.


I hooked endscene and detoured to my codecave if a flag is on. I turn the flag on after I write to my codecave so it is only executed when my flag is on. I have this part working. The problem is I am having issues calling DoString from my codecave.

This is what I had came up with to try to call DoString from my codecave, but it blows up. I was trying to mimic what the function at 0x495ECA was doing to call DoString.

String[] asm = new String[]
{
    "push 0",
    "mov eax, ["+LuaExecuteScriptPtr+"]", //Pointer to null terminated C string with LUA script to be executed
    "push eax",
    "push eax",
    "call 0x706C80", //call LUA DoString
    "add esp,12",
    "retn",
};

Any hints would be greatly appreciated

[squiggy]

here, you want to push the pointer to the stack, not the first char. I think that should solve it.

//old "mov eax, ["+LuaExecuteScriptPtr+"]", //Pointer to null terminated C string with LUA script to be executed
"mov eax, "+ LuaExecuteScriptPtr

If your interested here's the function signature: int __cdecl FrameScript__Execute(int a1, int a2, int a3)

[pinny]

here, you want to push the pointer to the stack, not the first char. I think that should solve it.

//old "mov eax, ["+LuaExecuteScriptPtr+"]", //Pointer to null terminated C string with LUA script to be executed
"mov eax, "+ LuaExecuteScriptPtr

If your interested here's the function signature: int __cdecl FrameScript__Execute(int a1, int a2, int a3)

Thank you so much squiggy I can't believe it was something so stupid!

[squiggy]

an easy mistake to make, glad it got sorted