[VC]Injecting DLL in C++ to Read and Write Memory

[EightyVice]

Ok, Welcome guys, as the topic says, i know C++ and wrote that code as a DLL

#include "stdafx.h"BOOL WINAPI DllMain(HMODULE hModule, DWORD ul_reason_for_call, PVOID lpvReserved){	switch (ul_reason_for_call)	{	case DLL_PROCESS_ATTACH:		// DO STUFF HERE 				break;	case DLL_THREAD_ATTACH:		break;	case DLL_THREAD_DETACH:		break;	case DLL_PROCESS_DETACH:		break;	}	return TRUE;}

so.

What i write to read a memory and write it ? use WriteProcessMemory function or something else , can u show me guys a small example and thanks

[madleg]

just cast memory address to pointer. For protected memory regions you should set virtual protect first.

[EightyVice]

just cast memory address to pointer. For protected memory regions you should set virtual protect first.

oh thanks very much, can u show small example to cast memory , let memory address is 0xAAFE8C

[madleg]

setting integer value at given address:

int* ptr = (int*)0xAAFE8C

*ptr = 123

 

or just *(int*)0xAAFE8C = 123

Edited August 22, 2017 by madleg

[EightyVice]

setting integer value at given address:

int* ptr = (int*)0xAAFE8C

*ptr = 123

 

or just *(int*)0xAAFE8C = 123

Thanks mate u are Awesome

[EightyVice]

ok well I did that code to make the health 100 forever

BOOL WINAPI VCCOOPDLL(HMODULE hModule, DWORD ul_reason_for_call, PVOID lpvReserved){	switch (ul_reason_for_call)	{	case DLL_PROCESS_ATTACH:		// DO STUFF HERE		for (;		{			*(float*)(0x94AD28 + 0x354) = 100;		}		break;	case DLL_THREAD_ATTACH:		break;	case DLL_THREAD_DETACH:		break;	case DLL_PROCESS_DETACH:		break;	}	return TRUE;}

so some people said compile that DLL and rename it into *.asi file and put it in root file of the game, i did that and the health decrease, also used cheat engine and injected the DLL and nothing happend , any help? did i do any thing wrong?

note: 0x94AD28 is CPed Pointer (Return to the player instance too) then we add 0x354 to get health and with value of float.

[spaceeinstein]

It's much easier to use plugin-sdk if you are just modifying known values and behaviors. There are lots of examples available there.

Edited August 23, 2017 by spaceeinstein

[EightyVice]

It's much easier to use plugin-sdk if you are just modifying known values and behaviors. There are lots of examples available there.

Thanks mate that will help me, but i have to make it DLL to control it from another C++ program, hmm let me explain

well iam making a Online COOP mod for Vice City , so i will make a DLL that will be injected with values like coordinates and health to make sync later

but the problem is in the DLL what i write, i make a DLL that can be injected easily in the game and be controled like the not working example above , or to make a DLL with (WriteProcessMemory) and that can be hard and take alot of time, i hope i explained that, so question is making a DLL in C++ that can be injected and thanks mates <3

[madleg]

your "hello world" is not working or will not work cause of many reasons:

VCCOOPDLL is just a function, nothing is calling it.

for (; ; ) is infinite loop and it has no break condition in your example

if 0x94ad28 is pointer to CPlayerPed, then you have to read this pointer first *(float*)(*(unsigned int*)0x94ad28 + 0x354) = 100

Edited August 23, 2017 by madleg

[spaceeinstein]

plugin-sdk still works if you're writing your code in C++. With plugin-sdk, madleg's line is equivalent to

 

FindPlayerPed()->m_fHealth = 100.0f;

[EightyVice]

your "hello world" is not working or will not work cause of many reasons:

VCCOOPDLL is just a function, nothing is calling it.

for (; ; ) is infinite loop and it has no break condition in your example

if 0x94ad28 is pointer to CPlayerPed, then you have to read this pointer first *(float*)(*(unsigned int*)0x94ad28 + 0x354) = 100

yea that what i want is how to call it xD

 

plugin-sdk still works if you're writing your code in C++. With plugin-sdk, madleg's line is equivalent to

FindPlayerPed()->m_fHealth = 100.0f;

Awesome mate, can i make a DLL in that SDK or it only make ASI? to be called later

and thanks guy for helping , i didnt even expected that , i thought that my topic will be ignored , thanks

[DK22Pac]

Yes, you can.

When project is created, go to project settings, and change target extension from ".asi" to ".dll" (for both Release and Debug modes).