Thread: [C++] Custom apis (inline)

Go to visual studio and start a windows console application. And create a simple message box inside Main,
your code will look like the following:

#include <Windows.h>

int main()

{

   DWORD dwMessageBoxA = (DWORD)MessageBoxA;

   char *lpText    = "Test";

   char *lpCaption   = "Hello World!";

   _asm push 0               //hWnd      

   _asm push lpText            //lpText      

   _asm push lpCaption            //lpCaption      

   _asm push 0               //uType   0 = MB_OK         

   _asm call dwMessageBoxA         //Our Call

   _asm add esp,0xC            //0xC = return



}

GHL.h

class GHL

{



//Api

void dwMessageBox(HWND hWnd,LPCSTR lpText,LPCSTR lpCaption,UINT uType);

void ExitUserProcess();

void DestroyWindow();



};



extern GHL					*GameHook;

GHL.cpp

void GHL::dwMessageBox(HWND hWnd,LPCSTR lpText,LPCSTR lpCaption,UINT uType)

{

	HMODULE USER32 = LoadLibraryA("user32.dll");

	DWORD dwMessageBoxA = (DWORD) GetProcAddress(USER32,"MessageBoxA");



	_asm push hWnd			//hwnd

	_asm push lpText			//lpText

	_asm push lpCaption		//lpCaption

	_asm push uType			//uType

	_asm call dwMessageBoxA      //Call 

	_asm add esp, 0xC			//Ret

}



void GHL::ExitUserProcess()

{

	HMODULE NTDLL = LoadLibraryA("ntdll.dll");

	DWORD dwExitProcess = (DWORD) GetProcAddress(NTDLL,"NtTerminateProcess");



	_asm push 0				//ExitCode

	_asm call dwExitProcess		//Call

	_asm add esp, 0xC			//Ret

}

void GHL::DestroyWindow()

{

	HMODULE KERNAL32 = LoadLibraryA("Kernel32.dll");

	DWORD dwDestroyWindow = (DWORD) GetProcAddress(KERNAL32,"DestroyWindow");

	HANDLE Cod4 = FindWindowA("Call of Duty 4","Call of Duty 4");



	_asm push Cod4			//hWnd

	_asm call dwDestroyWindow	//Call

	_asm add esp, 0xC			//Ret

}

You can use Theses like:

in dllMain.cpp

GHL								*GameHook;



BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved )

{

    switch( fdwReason ) 

    { 

		case DLL_PROCESS_ATTACH:

		{

			DisableThreadLibraryCalls(hinstDLL);

			main_hinstDLL = hinstDLL;

			LOG.Log("CREDIT","SALT3R <333");

                        GameHook->dwMessageBox(0,"Test","Test",MB_OK);

			return true;

		break;

		}

        case DLL_PROCESS_DETACH:

		{

	                 LOG.Log("CREDIT","SALT3R <333");

            break;

		}

    }

    return TRUE; 

}

Usage: Same as the default MessageBoxA...
P.S. It's written inline for education & getting used to using inline

by Salt3r