Microsoft Visual Studio 2010

#include <HookEngine/HookEngine.h>
#include <Windows.h>

typedef int (__stdcall *fnMessageBox)(HWND hWnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType);

// This function is almost same as original but calling convention is __fastcall now. Also It has two additional arguments.
// In second argument we expect original function address. First argument is unused.
int __fastcall MessageBoxAHook(int unused, fnMessageBox original, HWND hWnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType)
{
    return original(hWnd, "BAZINGA!", lpCaption, uType);
}

void main()
{
    MessageBoxA(0, "Not hooked yet", "Warning", MB_OK);

    HMODULE user32 = GetModuleHandleA("User32.dll");
    uint32_t original = (uint32_t)GetProcAddress(user32, "MessageBoxA");

    HookEngine::instance()
        ->fasthook(original, (uint32_t)MessageBoxAHook);

    MessageBoxA(0, "Not hooked yet", "Warning", MB_OK);
}

#include <HookEngine/HookEngine.h>
#include <Windows.h>

void main()
{
    auto messageBoxAHook = HookEngine::createHook<
        HookEngine::Stdcall, // target function calling convention
        int,                 // return type
        HWND hWnd,           //first argument type
        LPCSTR,              //second argument type
        LPCSTR,              //third argument type
        UINT                 //fourth argument type
    >("User32.dll", "MessageBoxA");

  // Set hook function.
    messageBoxAHook->assignHook([messageBoxAHook](HWND hWnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType) -> int {
        messageBoxAHook->original(0, "Hello from my first Hook!", "Warning", MB_OK);  //Call our payload
        return messageBoxAHook->original(hWnd, lpText, lpCaption, uType);             //and original
    });
}