MessageBox (A/W) Detour (Hook) C++

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

HMODULE hModule = GetModuleHandleA("User32.dll");
DWORD dwMessageBoxA_location = (DWORD)GetProcAddress(hModule, "MessageBoxA");
DWORD dwMessageBoxW_location = (DWORD)GetProcAddress(hModule, "MessageBoxW");

typedef int (WINAPI* tdMessageBoxA)(HWND, LPCSTR, LPCSTR, UINT);
typedef int (WINAPI* tdMessageBoxW)(HWND, LPCWSTR, LPCWSTR, UINT);
tdMessageBoxA p_tdMessageBoxA = NULL;
tdMessageBoxW p_tdMessageBoxW = NULL;

int WINAPI dtMessageBoxA(HWND hWnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType) {
    lpText = "Detoured MessageBoxA";
    return p_tdMessageBoxA(hWnd, lpText, lpCaption, uType);
}

int WINAPI dtMessageBoxW(HWND hWnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType) {
    lpText = L"Detoured MessageBoxW";
    return p_tdMessageBoxW(hWnd, lpText, lpCaption, uType);
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
    if (fdwReason == DLL_PROCESS_ATTACH) {
        p_tdMessageBoxA = (tdMessageBoxA)
            DetourFunction((PBYTE)dwMessageBoxA_location, (PBYTE)dtMessageBoxA);
            //DetourFunction((PBYTE)MessageBoxA, (PBYTE)dtMessageBoxA); would also work.
        p_tdMessageBoxW = (tdMessageBoxW)
            DetourFunction((PBYTE)dwMessageBoxW_location, (PBYTE)dtMessageBoxW);
            //DetourFunction((PBYTE)MessageBoxW, (PBYTE)dtMessageBoxW); would also work.
    } return 1;
}