#include <windows.h>
#include <detours.h>

// define a typedef for the original function
typedef int(WINAPI* PMessageBox)(HWND, LPCWSTR, LPCWSTR, UINT);

// define the function pointer for the original function
PMessageBox pMessageBox = MessageBoxW;

// define the replacement function
int WINAPI MyMessageBox(HWND hWnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType)
{
    return pMessageBox(hWnd, L"Hello from hooked function!", lpCaption, uType);
}

int main()
{
    // detour the MessageBoxW function to our replacement function
    DetourTransactionBegin();
    DetourUpdateThread(GetCurrentThread());
    DetourAttach(&(LPVOID&)pMessageBox, MyMessageBox);
    DetourTransactionCommit();

    // call the hooked function
    MessageBoxW(NULL, L"Hello world!", L"Greetings", MB_OK);

    // remove the hook and exit
    DetourTransactionBegin();
    DetourUpdateThread(GetCurrentThread());
    DetourDetach(&(LPVOID&)pMessageBox, MyMessageBox);
    DetourTransactionCommit();
    return 0;
}