#include "../MemoryModule/stdafx.h"

#include <cstdio>

static PVOID ReadDllFile(LPCSTR FileName) {

LPVOID buffer;

size_t size;

FILE* f;

fopen_s(&f, FileName, "rb");

if (!f)return 0;

_fseeki64(f, 0, SEEK_END);

if (!(size = _ftelli64(f))) {

fclose(f);

return 0;

}

_fseeki64(f, 0, SEEK_SET);

fread(buffer = new char[size], 1, size, f);

fclose(f);

return buffer;

}

int __stdcall test_user32() {

HMODULE hModule;

NTSTATUS status;

PVOID buffer = ReadDllFile("C:\\Windows\\System32\\user32.dll");

if (!buffer) return 0;

hModule = GetModuleHandleA("user32.dll");

if (hModule)return 0;

status = LdrLoadDllMemoryExW(

&hModule, // ModuleHandle

nullptr, // LdrEntry

0, // Flags

buffer, // Buffer

0, // Reserved

L"user32.dll", // DllBaseName

L"C:\\Windows\\System32\\user32.dll" // DllFullName

);

if (NT_SUCCESS(status) && status != STATUS_IMAGE_MACHINE_TYPE_MISMATCH) {

auto _MessageBoxW = (decltype(&MessageBoxW))GetProcAddress(hModule, "MessageBoxW");

_MessageBoxW(nullptr, L"Hello, from memory user32!", L"Caption", MB_OK);

//

// After calling MessageBox, we can't free it.

//

//LdrUnloadDllMemory(hModule);

}

return 0;

}