MinHook - The Minimalistic x86/x64 API Hooking Library

#include <Windows.h>
#include "MinHook.h"

#if defined _M_X64
#pragma comment(lib, "MinHook.x64.lib")
#elif defined _M_IX86
#pragma comment(lib, "MinHook.x86.lib")
#endif

typedef int (WINAPI *MESSAGEBOXW)(HWND, LPCWSTR, LPCWSTR, UINT);

// Pointer for calling original MessageBoxW.
MESSAGEBOXW fpMessageBoxW = NULL;

// Detour function which overrides MessageBoxW.
int WINAPI DetourMessageBoxW(HWND hWnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType)
{
    return fpMessageBoxW(hWnd, L"Hooked!", lpCaption, uType);
}

int main()
{
    // Initialize MinHook.
    if (MH_Initialize() != MH_OK)
    {
        return 1;
    }

    // Create a hook for MessageBoxW, in disabled state.
    if (MH_CreateHook(&MessageBoxW, &DetourMessageBoxW, 
        reinterpret_cast<void**>(&fpMessageBoxW)) != MH_OK)
    {
        return 1;
    }

    // Enable the hook for MessageBoxW.
    if (MH_EnableHook(&MessageBoxW) != MH_OK)
    {
        return 1;
    }

    // Expected to tell "Hooked!".
    MessageBoxW(NULL, L"Not hooked...", L"MinHook Sample", MB_OK);

    // Disable the hook for MessageBoxW.
    if (MH_DisableHook(&MessageBoxW) != MH_OK)
    {
        return 1;
    }

    // Expected to tell "Not hooked...".
    MessageBoxW(NULL, L"Not hooked...", L"MinHook Sample", MB_OK);

    // Uninitialize MinHook.
    if (MH_Uninitialize() != MH_OK)
    {
        return 1;
    }

    return 0;
}