#define WIN32_LEAN_AND_MEAN
#define NOUSER
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include "user32.h"

#define DLL_EXPORT __declspec(dllexport)

typedef int (WINAPI *MessageBoxAPtr)(HWND hwnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType);
typedef int (WINAPI *MessageBoxWPtr)(HWND hwnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType);

DLL_EXPORT WINAPI int MessageBoxA(HWND hwnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType) {
    MessageBoxAPtr proc = (MessageBoxAPtr) GetProcAddress(GetModuleHandle("_user32.dll"), "MessageBoxA");
    LPSTR buffer = malloc(strlen(lpText) + 1 + 26);
    strcpy(buffer, "MessageBoxA gruesst Sie!\n"),
    strcat(buffer, lpText);
    int result = proc(hwnd, buffer, lpCaption, uType);
    free(buffer);
    return result;
}

DLL_EXPORT WINAPI int MessageBoxW(HWND hwnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType) {
    MessageBoxWPtr proc = (MessageBoxWPtr) GetProcAddress(GetModuleHandle("_user32.dll"), "MessageBoxW");
    LPWSTR buffer = malloc(wcslen(lpText) + 1 + 26);
    wcscpy(buffer, L"MessageBoxW gruesst Sie!\n");
    wcscat(buffer, lpText);
    int result = proc(hwnd, buffer, lpCaption, uType);
    free(buffer);
    return result;
}