将函数int64 C ++返回到C＃项目

Question

i write a dll that is injected on game and return my localplayer and listArrayplayer on server. Ok work fine code dll project: C++ code:

__int64 RerturnLocalPlayer() {

    __int64 player = GetLocalPlayer_EX();// __Int64 GetLocalPlayer_EX() is a function that return type __int64 value
    return player;
}

in main.h:

extern "C" {

__declspec(dllexport) __int64 RerturnLocalPlayer();

}

mt function

extern "C" {
    __declspec(dllexport) __int64  GetLocalPlayer_EX()
    {
        DWORD64 pClientGameContext = *(DWORD64*)OFFSET_CLIENTGAMECONTEXT;
        if (!(pClientGameContext)) return 0;
        DWORD64 pPlayerManager = *(DWORD64*)(pClientGameContext + 0x68);
        if (!(pPlayerManager)) return 0;

        DWORD64 pObfuscationMgr = *(DWORD64*)OFFSET_ObfuscationMgr;
        if (!(pObfuscationMgr)) return 0;

        DWORD64 LocalPlayerListXorValue = *(DWORD64*)((DWORD64)pPlayerManager + 0xF0);
        DWORD64 LocalPlayerListKey = LocalPlayerListXorValue ^ *(DWORD64 *)(pObfuscationMgr + 0x70);
        hashtable<DWORD64>* table = (hashtable<DWORD64>*)(pObfuscationMgr + 8);
        hashtable_iterator<DWORD64> iterator = { 0 };

        hashtable_find(table, &iterator, LocalPlayerListKey);
        if (iterator.mpNode == table->mpBucketArray[table->mnBucketCount])
            return 0;

        DWORD64 EncryptedPlayerMgr = (DWORD64)iterator.mpNode->mValue.second;
        if (!(EncryptedPlayerMgr)) return 0;

        DWORD MaxPlayerCount = *(DWORD *)(EncryptedPlayerMgr + 0x18);
        if (MaxPlayerCount != 1) return 0;

        return EncryptedPlayerMgr__GetPlayer(EncryptedPlayerMgr, 0);
    }
}

C# Code:

[System.Runtime.InteropServices.DllImportAttribute("BFClient1.dll", EntryPoint = "RerturnLocalPlayer",
CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
public static extern Int64 RerturnLocalPlayer();                    
Int64 localp = NativeMemory.Read<Int64> (RerturnLocalPlayer());

 Console.WriteLine("LocalPlayer " + localp.ToString("X"));

the problem is when i run my c# application my console open and after 3 seconds close and sometimes get error: **Attempt to read or write to protected memory. Usually, this is an indication that another memory is damaged.

can some one try help me?

Answer 1

__int64 RerturnLocalPlayer() is a function that returns a 64-bit value through some calling convention. You seem to think it's stdcall , I think you're wrong. However I don't have your source code so you can bang your head against that wall on your own.

public static extern Int64 RerturnLocalPlayer(); is the right definition (again, calling convention aside, there's no 64-bit register on the 32-bit CPU, so it won't be stdcall ).

However, Int64 localp = NativeMemory.Read<Int64> (RerturnLocalPlayer()); is just plain bonkers. You're already getting your integer straight from the marshaller as a return value, use it as such! This would be the correct way of calling your function:

Int64 localp = RerturnLocalPlayer();