How to click CSimpleButton menu

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  1. #1
    oiramario's Avatar Member
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    How to click CSimpleButton

    I've only got CSimpleButton_Click, however not find CSimpleButton::OnClick.
    Code:
    __int64 __fastcall CSimpleButton_Click(__int64 a1)
    {
      unsigned int v2; // eax
      _BYTE *v3; // rsi
      _BYTE *v4; // rax
      __int64 result; // rax
      char *v6; // rbp
      __int64 v7; // rbx
      unsigned int v8; // eax
      const char *v9; // [rsp+48h] [rbp+10h] BYREF
    
      v2 = sub_1D49B00();
      v3 = 0i64;
      v9 = 0i64;
      v4 = sub_3B5DA0(&v9, a1, v2, 1u, 0, 0);
      if ( v9 )
        luaL_error(a1, v9);
      else
        v3 = v4;
      if ( (v3[18] & 5) != 0 )
      {
        luaL_error(a1, aClickCannotBeC);
        result = 0i64;
      }
      else
      {
        v6 = aLeftbutton;
        if ( (unsigned int)sub_19E67E0(a1, 2i64) )
          v6 = (char *)sub_19E8180(a1, 2u, 0i64);
        v7 = *(_QWORD *)v3;
        v8 = lua_toboolean(a1, 3i64);
        (*(void (__fastcall **)(_BYTE *, char *, _QWORD, _QWORD))(v7 + 496))(v3, v6, v8, 0i64);
        result = 0i64;
      }
      return result;
    }
    There is a function pointer call in CSimpleButton_Click, is that CSimpleButton::OnClick?
    Try to pass through address of StaticPopup1Button1 to v2 to direct call.
    Code:
            "StaticPopup1"
                "StaticPopup1Text" = ""
            "StaticPopup1Button1"
                "StaticPopup1Button1Text" = ""
    Code:
        click_popup_frame_func = Functions.click_popup_frame_functype(Addr + 0x1F0 )
        X = b'LeftButton'
        click_popup_frame_func(Addr, ctypes.c_char_p(X), ctypes.c_int64(1), ctypes.c_int64(0))
    I avoid call lua directly.
    But got a failure. Could you pls give me some advice?
    Code:
    exception: access violation writing 0x000001D85B2620B8
    Any address or hints are welcome.
    Thanks very much.
    Last edited by oiramario; 05-09-2021 at 09:39 PM.

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  2. #2
    _chase's Avatar Active Member
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    For reversing how to click frames there is a better function to check out,
    In IDA there is one function with the string, ":Click cannot be called on Forbidden frames." which I believe corresponds to wow lua's "Frame.Click()"
    In this function you'll see there is a call to a function from the frame's vmt



    And here is a demo of how you can use those vmt functions

    === Frame Struct ===
    Code:
    #pragma  pack(push, 1)
    class Frame
    {
    public:
    	uintptr_t vmt; // 0x08
    
    	char padding_0x20[0x18]; // 0x20
    	char* name; // 0x28
    
    	char padding_0xC8[0xA0]; // 0x28 - 0xC8
    	uint32_t visible; // 0xC8 - 0xCC
    };
    #pragma  pack(pop)
    Code:
    void Frames::ClickFrame(const Frame* frame) {
    	auto click = *reinterpret_cast<void(__fastcall**)(const Frame*, const char*, BOOL, int64_t, BYTE, BYTE)>(frame->vmt + Offsets::Frame_Click);
    	click(frame, "LeftButton", false, 0i64, 0, 0);
    }
    
    void Frames::RightClickFrame(const Frame* frame) {
    	auto click = *reinterpret_cast<void(__fastcall**)(const Frame*, const char*, BOOL, int64_t, BYTE, BYTE)>(frame->vmt + Offsets::Frame_Click);
    	click(frame, "RightButton", false, 0i64, 0, 0);
    }

  3. Thanks oiramario (1 members gave Thanks to _chase for this useful post)
  4. #3
    oiramario's Avatar Member
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    Thank you very much. It's solved.
    We're talking about the same function: CSimpleButton::OnClick, you could get it with Object_FillScriptMethodTable or FrameScript::RegisterFunctionNamespaceWithCount.
    More lua functions are useful to reverse engineering even you dont call them.
    Thanks for @charles420. This will be helpful. https://www.ownedcore.com/forums/wor...a-scripts.html

    Code:
    auto ret0 = MemoryRead<uint64_t>(StaticPopup1Button1Address);
    auto ret1 = MemoryRead<uint64_t>(ret0 + ClickOffset);
    Last edited by oiramario; 05-12-2021 at 06:50 PM.

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